ED Decision 2020/012/R
Summary of
the guidance items:
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Item |
ATA |
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Headset (MC) |
23-10-1 |
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Audio Selector Panel |
23-10-2 |
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Flight Crew Compartment Speaker |
23-10-3 |
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HF Communications |
23-11-1 |
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VHF Communications |
23-12-1 |
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Audio Selector Panel Frequency Controls and Indications |
23-13-1 |
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Public Address System |
23-30-1 |
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Datalink |
23-30-2 |
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Flight Crew Interphone System (Flight Crew Compartment Intercommunication) (MC) |
23-40-1 |
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Crew Member Interphone System (MC) |
23-40-2 |
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Flight Crew Compartment Door Surveillance System (MC) |
23-70-1 |
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Cockpit Voice Recorder (MC) |
23-71-1 |
Aircraft applicability: Aeroplanes
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ATA Chapter: 23 Communications |
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(1) System
& Sequence Numbers |
(2) Rectification
Interval |
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ITEM |
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(3) Number
installed |
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(4) Number
required for dispatch |
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(5) Remarks
or Exceptions |
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23-10-1 |
Headset (MC) |
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23-10-1A |
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D |
- |
- |
Any in excess of one headset (including boom microphone) for each required crew member on flight crew compartment duty may be inoperative or missing. |
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Additional considerations:
Additional certification requirements may impose additional
restrictions (e.g. spare headset on single pilot helicopter).
Aircraft applicability: Aeroplanes & Helicopters
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ATA Chapter: 23 Communications |
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(1) System
& Sequence Numbers |
(2) Rectification
Interval |
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ITEM |
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(3) Number
installed |
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(4) Number
required for dispatch |
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(5) Remarks
or Exceptions |
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23-10-2 |
Audio Selector Panel |
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23-10-2A |
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D |
- |
- |
Any in excess of one for each required crew member on flight crew compartment duty may be inoperative. |
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23-10-2B |
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D |
- |
- |
May be inoperative provided: |
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(a) The
flight is conducted under VFR, and (b) Required communication can be ensured using alternate means. |
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23-10-2-1 |
Press To Transmit (PTT) Switch |
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23-10-2-1A |
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B |
- |
- |
(M) Any in excess of one for each required flight crew member may be inoperative provided the affected switch is either verified failed open (non-transmitting) or is deactivated. |
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Procedures |
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(M) Check of the failure of the switch in open (non-transmitting) position or deactivation in open position. |
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Additional considerations:
Additional requirements may be introduced if the Audio Selector Panel failure has consequences on the aural warning broadcasting.
All aural alerts, messages and other communication which are normally routed through the flight crew compartment speakers must be audible through the headsets.
There may be components of the audio control panel inoperative; however, the panel is still adequate for flight. Above items do not address sub-components (e.g. ADF identification function) and it is considered the captain’s decision to dispatch with necessary equipment operative.
Operators of Helicopter Emergency Medical Service (HEMS) or helicopters employing rescue equipment (i.e. winches, etc.) or human external cargo may need to consider whether additional crew members (not situated within the flight crew compartment) are included within their MEL alleviation.
Aircraft applicability: Aeroplanes & Helicopters
ATA Chapter: 23 Communications |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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23-10-3 |
Flight Crew Compartment Speaker |
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23-10-3A |
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C |
- |
0 |
(O) May be inoperative provided: |
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(a) A
headset is operative for each required crew member on flight crew
compartment duty, and (b) A spare operative headset is readily available in the flight crew compartment for use by any of the required crew member on flight crew compartment duty. |
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Procedures (O) To provide alternate procedures for the use of headsets, as appropriate. |
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Additional considerations:
It should be ensured that the affected speaker is not used for crew intercommunication when smoke masks are used unless single pilot operations are conducted.
If there are emergency (e.g. smoke) procedures which require the crew to establish communication then relief for both cannot be granted, but depending on flight test results, relief for one may be possible.
All aural alerts, messages and other communication which are normally routed through the flight crew compartment speakers should remain audible through the headsets and be recordable by the CVR (or the CVR should be considered inoperative). In the case aural alerts and required communications could be heard only through the headsets, these should be worn permanently by at least one crew member on flight crew compartment duty.
Considerations should be given to audio system configuration in degraded electrical configuration, in particular when credit has been taken on the availability of flight crew compartment speakers.
Aircraft applicability: Aeroplanes & Helicopters
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ATA Chapter: 23 Communications |
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(1) System
& Sequence Numbers |
(2) Rectification
Interval |
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ITEM |
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(3) Number
installed |
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(4) Number
required for dispatch |
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(5) Remarks
or Exceptions |
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23-11-1 |
HF Communications |
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23-11-1A |
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D |
- |
- |
Any in excess of those required for the intended flight route, may be inoperative. |
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23-11-1B |
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C |
- |
1 |
(O) Any in excess of one may be inoperative provided: |
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(a) SATCOM air-ground communications
with Air Traffic Service Providers (ATSPs) are available for the intended
flight route, (b) SATCOM Voice or Data transfer
functions are operative, (c) Prior to each flight, coordination
with the appropriate Air Navigation Service Provider(s) is established where
INMARSAT codes, or equivalent, are not available whilst using SATCOM voice
function, and (d) Alternate communication procedures are established and used. |
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Note: The intended flight route corresponds to any point on the route including diversions to reach alternate aerodromes required to be selected by the operational rules. |
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Procedures (O) To provide alternate communication procedures. SATCOM is to be used only as a backup to normal HF communications unless otherwise authorised by the appropriate Air Navigation Service Provider(s) |
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(continued) |
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ATA Chapter: 23 Communications |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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(continued) |
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23-11-1C |
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A |
- |
1 |
(O) Any in excess of one may be inoperative for a maximum of 3 calendar days provided alternate communication procedures are established and used. |
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Procedures (O) To provide alternate communication procedures. When the route enters airspace for which an In Flight Blind Broadcast Procedure exists, select the appropriate I.F.B.B. VHF frequency and apply the procedure. |
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Additional considerations:
When relief if foreseen for an HF communication system powered under an emergency bus, additional considerations should account for the capability to maintain an acceptable level of safety with residual means of communication and navigation, depending on the kind of operations (e.g. ETOPS) and impose additional restrictions, as necessary.
23-11-1A:
This entry allows dispatch with HF communication in excess of the applicable requirements.
A radio communication system is required for operations in a controlled airspace, under IFR or at night.
In addition, for Commercial Air Transport operations under IFR or under VFR over routes that cannot be navigated by reference to visual landmarks, two independent means of communication are required and each system should have an independent antenna installation, except where rigidly supported non-wire antenna or other antenna installations of equivalent reliability are used.
23-11-1B & C:
These entries are applicable for flights on routes that require two long range communication systems.
Although SATCOM voice and data link may be used as long range communication systems in order to meet applicable operational requirements, not all ATC facilities are adequately equipped to handle SATCOM data or voice as the primary means of communication.
SATCOM data or voice may however be accepted as a backup to normal HF communication systems.
HF-voice is the only LRCS currently available for Air Traffic Control communications in many areas.
Therefore, in areas requiring two operational LRCSs, at least one must be HF-voice and in areas requiring one LRCS, that system must be HF-voice.
Additional restriction to ensure availability of ACAS may be considered.
Aircraft applicability: Aeroplanes & Helicopters
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ATA Chapter: 23 Communications |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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23-12-1 |
VHF Communications |
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23-12-1A |
(Other than CAT) |
D |
- |
- |
Any in excess of those required may be inoperative. |
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23-12-1B |
(CAT) |
C |
- |
1 |
(O) Any in excess of one, may be inoperative provided: |
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(a) Operations are conducted under VFR over routes navigated by reference to visual landmarks, (b) Applicable airspace requirements for the intended flight route are complied with, and (c) Alternate procedures are established and used, if applicable. |
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Procedures (O) To provide alternate procedures if the affected VHF was used to accomplish procedures for the intended flight route. To provide procedures to address next in-flight failure of the remaining system, if not otherwise available. |
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23-12-1C |
(CAT) |
C |
- |
2 |
(O) Any in excess of two, may be inoperative provided alternate procedures are established and used, if applicable. |
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Procedures See 23-12-1B. |
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Additional considerations:
When relief if foreseen for a VHF communication system powered under an emergency bus, additional considerations should account for the capability to maintain an acceptable level of safety with residual means of communication and navigation, depending on the kind of operations and impose additional restrictions, as necessary.
Additional condition on SSR transponder availability to cover next in-flight failure may be needed.
Aircraft applicability: Aeroplanes & Helicopters
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ATA Chapter: 23 Communications |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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23-13-1 |
Audio Selector Panel Frequency
Controls and Indications |
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23-13-1-1 |
Frequency Transfer Light |
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23-13-1-1A |
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C |
- |
0 |
May be inoperative. |
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23-13-1-2 |
Frequency Transfer Switch |
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23-13-1-2A |
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C |
- |
0 |
May be inoperative. |
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23-13-1-3 |
Frequency Selector Knob |
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23-13-1-3A |
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C |
- |
2 |
Any in excess of two may be inoperative. |
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23-13-1-4 |
Frequency Indication |
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23-13-1-4A |
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C |
- |
2 |
Any in excess of two may be inoperative. |
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Additional considerations:
This guidance may be adapted to the aircraft’s specific design.
Aircraft applicability: Aeroplanes & Helicopters
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ATA Chapter: 23 Communications |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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Item |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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23-20-1 |
Datalink (MC) |
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23-20-1A |
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C |
- |
0 |
(O) May be inoperative provided alternate procedures are established and used. |
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Procedures (O) To provide alternate procedure to the crew to manage communications, as applicable in the airspaces in which aircraft is operated. |
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23-20-1B |
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D |
- |
0 |
May be inoperative provided procedures do not require its use. |
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Additional considerations:
Option 23-20-1B is applicable for aircraft not required to have datalink installed as per Commission Regulation (EC) No 29/2009 or whenever aircraft is operated below FL285.
Aircraft applicability: Aeroplanes & Helicopters
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ATA Chapter: 23 Communications |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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23-30-1 |
Public Address (PA) System |
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23-30-1A |
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D |
- |
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Any in excess of those required may be inoperative provided procedures do not require their use. |
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23-30-1B |
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C |
- |
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(O) Any in excess of those required may be inoperative provided alternate procedures are established and used. |
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23-30-1C |
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B |
- |
0 |
(O) May be inoperative provided: |
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(a) Alternate procedures are established and used, and b) Flight crew compartment from and to cabin interphone system (including audio and visual alerting system) is operative. |
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Procedures: (O) To provide alternate normal and emergency communication procedures between flight crew compartment and cabin and/or operating restrictions as appropriate for the intended operations. |
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23-30-1D |
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D |
- |
0 |
(O) May be inoperative provided operations are conducted in cargo only configuration with all occupants in the Flight Crew Compartment. |
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Procedures: (O) To provide alternate normal and emergency communication procedures and/or operating restrictions as appropriate for the intended operations. |
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(continued) |
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ATA Chapter: 23 Communications |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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(continued) |
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23-30-1E |
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C |
- |
0 |
(O) May be inoperative provided: |
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(a) Operations are conducted in cargo only configuration, and (b) Flight crew compartment/cabin interphone system (including audio and visual alerting system) is operative, and (c) Alternate procedures are established and used. |
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Procedures: (O) To provide alternate normal and emergency communication procedures and/or operating restrictions as appropriate for the intended operations. |
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23-30-1F |
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D |
- |
0 |
(O) May be inoperative provided: |
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(a) Operations are conducted with no passengers, (b) All occupants are in the flight crew compartment. |
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Additional considerations:
The alternate procedures will have to be developed to account for any procedures based on the use of the PA, in particular in areas such as lavatories and crew rest, etc.
Aircraft applicability: Aeroplanes & Helicopters
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ATA Chapter: 23 Communications |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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23-40-1 |
Flight Crew Interphone System (Flight
Crew Compartment Intercommunication) (MC) |
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23-40-1A |
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D |
- |
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Any system in excess of those required may be inoperative. |
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Additional considerations:
N/A
Aircraft applicability: Aeroplanes & Helicopters
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ATA Chapter: 23 Communications |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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23-40-2 |
Crew Member Interphone System (MC) |
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23-40-2A |
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D |
- |
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Any in excess of those required may be inoperative provided procedures do not require their use. |
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23-40-2B |
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C |
- |
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(O) Any in excess of those required may be inoperative provided alternate procedures are established and used. |
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23-40-2-1 |
Flight Crew Compartment to Cabin Cabin to Flight Crew Compartment Interphone |
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23-40-2-1A |
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B |
- |
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(O) May be inoperative provided: |
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(a) An adequate number of interphone terminals, accessible by each required cabin crew from its assigned area or from the nearest assigned area are operative, and (b) Alternate procedures are established and used, and (c) Flight crew compartment interphone aural alerting system is operative. |
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Procedures: (O) To provide alternate normal and emergency communication procedures between flight crew compartment and cabin including access to the flight crew compartment from the cabin and/or operating restrictions as appropriate for the intended operations |
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(continued) |
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ATA Chapter: 23 Communications |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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(continued) |
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23-40-2-2 |
Flight Crew Compartment Handset (if installed) |
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23-40-2-2A |
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C |
- |
0 |
(O) May be inoperative provided: |
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(a) Flight crew compartment to cabin communication is operative, and (b) Alternate procedures are established and used. |
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Procedures: (O) To provide alternate normal and emergency communication procedures between flight crew compartment and cabin and/or operating restrictions as appropriate for the intended operations. |
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23-40-2-3 |
Cabin to Cabin Interphone |
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23-40-2-3A |
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C |
- |
0 |
(O) May be inoperative provided alternate procedures are established and used. |
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Procedures: (O) To provide alternate normal and emergency communication procedures between affected crew members using or not the public address system and/or operating restrictions as appropriate for the intended operations. |
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23-40-2-4 |
Flight Crew Compartment and/or Cabin to Crew Rest Facility/Bunk |
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23-40-2-4A |
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C |
- |
0 |
(O) May be inoperative provided: |
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(a) Public address system is operative, and (b) Alternate procedures are established and used. |
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(continued) |
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ATA Chapter: 23 Communications |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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(continued) |
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Procedures: (O) To provide alternate normal and emergency communication procedures between affected crew members and/or operating restrictions as appropriate for the intended operations. |
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23-40-2-4B |
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C |
- |
0 |
(O)(M) May be inoperative provided: |
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(a) Affected crew rest facility/bunk is not occupied, and |
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(b) Affected crew rest facility/bunk is placarded ‘DO NOT OCCUPY’. |
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Procedures: (O) To provide alternate normal and emergency communication procedures between affected crew members and/or operating restrictions as appropriate for the intended operations. (M) To give guidance reference for placarding the affected area. |
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23-40-2-5 |
Alerting System (Audio/Visual) |
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23-40-2-5A |
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C |
- |
- |
(O) May be inoperative provided: |
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(a) Flight crew compartment call audio alerting system is operative, (b) Public Address system is operative, and (c) Alternate procedures are established and used. |
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Note: If the lavatory smoke alerting system is affected, the lavatory smoke detector is considered inoperative (refer to 26-17-1) or an alternate indication must be operative (e.g. flight crew compartment alert). |
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Procedures: (O) To provide alternate normal and emergency communication procedures for contacting crew members as appropriate for the intended operations. |
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(continued) |
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ATA Chapter: 23 Communications |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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(continued) |
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23-40-2-6 |
Cabin Handset |
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23-40-2-6A |
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C |
- |
- |
(O) One or more may be inoperative provided: |
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(a) At least 50 % of the cabin handset is operative, (b) One handset is operative at each pair of floor level exit door, (c) Operative handsets are located at operative cabin crew seats, and (d) Alternate procedures are established and used. |
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Procedures: (O) To provide alternate normal and emergency communication procedures as appropriate for the intended operations. |
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23-40-2-6B |
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C |
- |
- |
(O) May be inoperative at any non-required cabin crew seat. |
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23-40-2-7 |
Flight Crew to Ground/Ground to Flight Crew Interphone (MC) |
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23-40-2-7A |
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C |
1 |
0 |
(O) May be inoperative provided alternate procedures are established and used. |
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Procedures: (O) To provide alternate communication procedures between flight crew compartment and ground as appropriate for the intended operations. |
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Additional considerations:
23-40-2-1
In order to determine the minimum required interphone terminals (handsets) in the cabin, the accessibility (cabin layout, monuments impairing visibility) and the distance from any point of the area assigned to the required cabin crew to the next operative interphone terminals have to be considered.
Any crew interphone station that is operative may be used.
Aircraft applicability: Aeroplanes
ATA Chapter: 23 Communications |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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23-70-1 |
Flight Crew Compartment Door
Surveillance System (e.g. CCTV) (MC) |
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23-70-1A |
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D |
- |
0 |
(O) May be inoperative provided that alternate procedures are established and used. |
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Additional considerations:
ORO.SEC.100.A of Annex III (Part-ORO) to Regulation (EU) No 965/2012 states that for flight crew compartment security reasons, a means should be provided to monitor, from either pilot’s station, the area outside the flight crew compartment to the extent necessary to identify any persons who request entry to the flight crew compartment, and to detect any suspicious behaviour or potential threat.
The installation of a CCTV system enables compliance with the above regulation so that the pilot can monitor the area while seated at his or her station.
Means such as a spyhole, in combination with procedures that are based on the minimum number of flight crew members who have to be present in the compartment, may be used as an acceptable alternate method.
Aircraft applicability: Aeroplanes & Helicopters
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ATA Chapter: 23 Communications |
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(1) System & Sequence Numbers |
(2) Rectification Interval |
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ITEM |
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(3) Number installed |
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(4) Number required for dispatch |
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(5) Remarks or Exceptions |
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23-71-1 |
Cockpit Voice Recorder System (MC) |
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23-71-1A |
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D |
- |
- |
Any in excess of those required by regulations may be inoperative. |
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23-71-1B |
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A |
- |
0 |
May be inoperative provided that: |
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(a) The aircraft does not exceed 8 further consecutive flights with the cockpit voice recorder inoperative, (b) Less than a maximum of 72 hours have elapsed since the cockpit voice recorder was found to be inoperative, and (c) Any Flight Data Recorder required to be carried is operative. |
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Note 1: This alleviation is not applicable to Flight data and cockpit voice combination recorders. For those combined systems, see the entries for combination recorders in item 31-31-2. Note 2: If an Underwater Locating Device (ULD) is required by regulation to be fitted to the CVR and this ULD is inoperative, the associated CVR is considered to be inoperative. If an Emergency Locator Transmitter (ELT) is required by regulation to be fitted to the CVR and this ELT is inoperative, the associated CVR is considered to be inoperative. |
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Additional considerations:
N/A
Issue No: MMEL/2