AMC1 ACNS.E.LAD.310 Environmental and crash conditions encountered
during accidents
ED Decision 2021/008/R
ACCEPTABLE MEANS OF COMPLIANCE APPLICABLE TO ALL SOLUTIONS
(a) The system should meet the certification specifications for the transmission of activation signals, while the equipment needed for that function is subject to the environmental test conditions of Tables 1 and 2 of this AMC, except for ELTs that are approved in accordance with European Technical Standard Order (ETSO)-C126c.
(b) If activation signals need to be transmitted by non-deployable equipment after reaching the point of end of flight to meet CS ACNS.E.LAD.410, that equipment (including antennas) should be demonstrated to pass the following tests:
(1) the impact shock test of EUROCAE ED-112A, Section 2-4.2.1;
(2) the penetration resistance test of EUROCAE ED-112A, Section 2-4.2.3;
(3) the static crush test of EUROCAE ED-112A, Section 2-4.2.4; and
(4) the high-temperature fire test of EUROCAE ED-112A, Section 2-4.2.5, except that the duration of the high-temperature fire test does not need to be longer than the time that is sufficient for transmitting the activation signals and complying with CS ACNS.E.LAD.410. Successful transmission of activation signals should be demonstrated at the end of this sequence of tests.
(c) If activation signals need to be transmitted by non-deployable equipment after reaching the point of end of flight to meet CS ACNS.E.LAD.420, that equipment (including antennas) should successfully transmit the activation signals after being subjected to the environmental tests applicable to an ELT(AF) in Tables 4-1 and 4-2 of EUROCAE ED-62B (including Change 1). However, if the duration of the flame test of EUROCAE ED-62B, Section 4.5.13 is not sufficient to ensure that at least a complete data set, such as that specified in CS ACNS.E.LAD.140, is received and that CS ACNS.E.LAD.420 is met, an appropriate duration should be determined and used for the flame test.
(d) If activation signals need to be transmitted by deployable equipment after reaching the point of end of flight to meet CS ACNS.E.LAD.140, that equipment should meet the same environmental standard as specified for an ADFR in European Technical Standard Order (ETSO)‑2C517, and should be installed as specified for an ADFR in CS 25.1457 of the Certification Specifications for Large Aeroplanes (CS-25), except that the recording of data to facilitate accident investigations is not necessary for compliance with CS ACNS.E.LAD.310.
(e) The homing-signal transmitter and antennas that are used by the system for transmitting the homing signal should successfully transmit the 121.5-MHz homing signal when subjected to the environmental tests applicable to an ELT(AF) in Tables 4-1 and Table 4-2 of EUROCAE ED-62B (including Change 1).
(f) If ELTs are used to meet CS ACNS.E.LAD.310, they should be installed in accordance with EUROCAE ED-62B (including Change 1), Chapter 6.
Table
1 — Minimum environmental qualification level test conditions applicable to
the system
|
The following tests may be performed
in any order or combination. Unless otherwise specified, compliance with
requirements on the transmission of activation signals (CS ACNS.E.LAD.110 and CS ACNS.E.LAD.120) as well as
compliance with requirements on the information of activation signals (CS ACNS.E.LAD.140) should be ensured for each test. In
addition, the test should be considered failed if undesirable activation
occurs during the test. Equipment that is used by the system
may be replaced between tests. Unless otherwise specified, dedicated power
sources may be replaced if the duration of the test is greater than the
duration of the battery capacity. The test categories indicated in this
Table are those defined in EUROCAE ED-14G. The column ‘Test categories’
contains a mention of ‘(MINIMUM)’ because more stringent test categories may
be required to demonstrate that the system performs as intended under
specific environmental conditions applicable to an aircraft type. When no
test category is indicated in this Table, select an appropriate test
category for the system. If the system includes deployable
equipment, ‘The system should be activated’ in column ‘ADDITIONAL TEST
CONDITIONS’ means that the system should be activated without deploying that
equipment, and that the performance of the automatic deployment does not
need to be checked (‘System performance should be checked’ does not include
checking the performance of the deployment mechanism). Note: the environmental conditions
and test procedures that are described in EUROCAE ED-14G and in RTCA DO-160G
are identical so that RTCA DO-160G may be used instead of EUROCAE ED-14G. |
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TESTS
ACCORDING TO EUROCAE ED-14G |
ADDITIONAL TEST CONDITIONS |
||
|
CONDITIONS |
SECTION IN ED-14G |
TEST CATEGORIES (MINIMUM) |
|
|
Temperature
and altitude Low
temperature High
temperature Altitude |
4.0 4.5.1 4.5.2 & 4.5.3 4.6.1 |
A1 |
The system should be activated before the test; compliance with CS ACNS.E.LAD.120 and CS ACNS.E.LAD.140 should be ensured during the test. If the projected duration of the test is greater than the duration of the dedicated power source, system activation can be delayed until the temperature is stabilised at the operating temperature. |
|
Decompression Overpressure |
4.6.2 4.6.3 |
A1 |
The decompression test should be performed at a pressure altitude of 50 000 ft. The system performance should be checked after the test. |
|
Temperature
variation |
5.0 |
B |
The system should be activated before the test; CS ACNS.E.LAD.120 and CS ACNS.E.LAD.140 should be met during the test. |
|
Humidity |
6.0 |
B |
System performance should be checked after the test. |
|
Operational
shock & crash safety |
7.0 |
|
System performance should be checked after the test. |
|
Vibration |
8.0 |
R and H |
The system should be activated before the test; compliance with CS ACNS.E.LAD.120 and CS ACNS.E.LAD.140 should be ensured during the test. |
|
Waterproofness |
10.0 |
W |
The system performance should be checked after the test. |
|
Magnetic
effect |
15.0 |
B |
The system should be activated before the test. |
|
Power
input |
16.0 |
|
The system should be activated before the test; compliance with CS ACNS.E.LAD.120 and CS ACNS.E.LAD.140 should be ensured during the test in both normal and abnormal operating conditions. |
|
Voltage
spike |
17.0 |
|
The system should be activated before the test; compliance with CS ACNS.E.LAD.120 and CS ACNS.E.LAD.140 should not be affected by the test conditions. |
|
Audio
frequency susceptibility |
18.0 |
|
System performance should be checked during the test. |
|
Induced
signal susceptibility |
19.0 |
|
System performance should be checked during the test. |
|
Radio
frequency susceptibility |
20.0 |
TR |
System performance should be checked during the test. |
|
Radio
frequency transmission |
21.0 |
H |
|
|
Lightning-induced
transient susceptibility |
22.0 |
|
System performance should be checked after the test. |
|
Lightning
direct effects |
23.0 |
|
The test is applicable to external antennas only. The antenna should still be operative after the test. |
|
Icing |
24.0 |
|
The test is applicable to external antennas and equipment. Compliance with CS ACNS.E.LAD.120 and CS ACNS.E.LAD.140 should be ensured during the test. |
|
Electrostatic
discharge |
25.0 |
A |
System performance should be checked after the test. |
|
Flammability |
26.0 |
C |
|
Table
2 — Flame test
|
CONDITIONS |
TEST
CONDITIONS |
|
Flame |
The flame test should be performed for the following components: transmitter of activation signals, antennas used by the system, and antenna cabling. At the start of the flame test, the temperature of these components should be stabilised at an ambient room temperature. The fire source should be in a tray of 1 m2 and 100 mm deep, containing water with a depth of 50 mm, in which 10 l of Avgas 100 LL is floating. The Avgas should be ignited and allowed to burn for 15 (± 2) seconds, before performing the following flame test: (a) place the components in a position directly over the centre of the fire tray at a height of 1 m (± 25 mm) above the tray; and (b) let the components remain in the flame for a duration corresponding to the time frame defined in CS ACNS.E.LAD.110. The flame test should be conducted in conditions as near as practicable to still air conditions. After removal from the flame, the components of the test should be allowed to cool naturally to ambient temperature before being tested. Compliance with CS ACNS.E.LAD.120 and CS ACNS.E.LAD.140 should be ensured after the test. |
[Issue: CS-ACNS/3]
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