AMC1 ACNS.D.ELS.010 Transponder
characteristics
ED Decision 2013/031/R
(1) To be approved, the Mode S transponder should hold an EASA equipment authorisation in accordance with European Technical Standard Order ETSO-C112d, or an equivalent standard that is consistent with ICAO Annex 10 Volume IV and which is acceptable to the responsible certification authority.
Note: ETSO-C112d requires compliance with EUROCAE ED-73E.
(2) The transponder class can be verified by checking that the transponder DDP declares the transponder level as ‘2’, ‘3’, ‘4’, or ‘5’.
Note: The definition of a level 2 transponder and
associated functions can be found in EUROCAE ED-73E paragraph 1.4.2.1, 3.22
and 3.23.
(3) The SI code capability can be verified by checking that the transponder DDP indicates the letter ‘s’ in the transponder capability declaration.
Note 1: The DDP indicates those requirements of ED-73E (or
later version) with which the transponder is not compliant with.
Note 2: The transponder SI code capability can be found in
EUROCAE ED-73E paragraph 3.18.4.34. SI codes have been allocated to Mode S
radars used in Europe and it is, therefore, an important capability to ensure
correct detection of the aircraft.
(4) The Elementary Surveillance functionality can be verified by checking that the transponder DDP indicates the letter ‘l’ for ELS or ‘n’ for EHS in the transponder capability declaration.
Note: Such transponders meet the requirements specified in
EUROCAE ED-73E 3.29. According to ED-73E, a transponder with the Enhanced
Surveillance capability has also the Elementary Surveillance capability.
(5) ACAS compatibility can be verified by checking that the transponder DDP indicates the letter ‘a’ in the transponder capability declaration.
Note: Necessary capabilities to be an ACAS-compatible Mode S
transponder are described in section 3.27 of EUROCAE ED-73E.
(b) Minimum output power level: The transponder power output capability should be verified as follows, depending on the aircraft capability:
(1) For aircraft that operate at altitudes exceeding 4 570m (15 000ft) or with maximum cruising speed exceeding 90 m/s (175 knots), the class of the transponder declared in the transponder DDP should be Class 1.
(2) For aircraft operating at or below 4570m (15 000ft) with a maximum cruising airspeed of 90 m/s (175 knots) or less, the class of the transponder declared in the transponder DDP should be Class 1 or Class 2.
Note: Classes of equipment are defined in EUROCAE ED-73E
1.4.2.4. Power characteristic is defined in ICAO Annex 10 Volume IV
3.1.1.7.11.
EASA aviation regulations require Mode S transponders to meet specific standards for airborne surveillance. Transponders must have EASA authorization, declaring appropriate levels and capabilities (SI code, Elementary Surveillance, ACAS compatibility) within their Data Declaration Page (DDP). Minimum output power depends on aircraft altitude and speed, verified by transponder class declaration.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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