AMC1
ACNS.D.AC.010 Transponder characteristics
ED Decision 2013/031/R
(1) To be approved, the Mode A/C only transponder should hold an EASA equipment authorisation in accordance with European Technical Standard Order ETSO-C74d, or an equivalent standard that is consistent with ICAO Annex 10 Volume IV, and which is acceptable to EASA.
(2) The Mode A/C only transponder should be a class 2A / class 2B as defined in ETSO-C74d.
Note 1: ETSO-C74d Class 2
equipment meets EUROCAE Document 1/WG9 /71 June 1972 with amendment 1 and 2.
Amendment 2 contains the requirements and tests to show that the transponder
correctly replies to Mode A/C-only all call interrogations and to Mode A/C/S
all-call interrogations used by Mode S radars.
Note 2: RTCA DO-144 does
not include requirement to reply to Mode A/C/S All-Call and Mode A/C-Only
All-Call interrogations and is, therefore, not sufficient to prove the
compliance. RTCA DO-144A contains the requirements for the equipment to reply
to Mode A/C/S All-Call and Mode A/C-Only All-Call interrogations.
Note: The rate of 1 000 replies per second for a
limited duration of 100ms is an acceptable deviation to ETSO-C74d.
Note 1: A 15-pulse reply includes 2 framing pulses, 12
information pulses, and the SPI pulse.
Note 2: The transponder should be capable of replying to
this short-term burst rate, even though the transponder may not be capable of
sustaining this rate.
Note 3: The rate of 1 200 replies per second for a
limited duration of 0,1 s is an acceptable deviation to ETSO-C74d.
(c) 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 4 570 m (15 000 ft) or with maximum cruising speed exceeding 90 m/s (175 knots), the class of the transponder declared in the transponder DDP should be Class A.
(2) For aircraft operating at or below 4 570m (15 000 ft) 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 A or Class B.
EASA aviation regulations require Mode A/C transponders to meet ETSO-C74d or equivalent ICAO standards for equipment authorization. Transponders must be class 2A/2B and reply to specific interrogations. Reply rates vary based on altitude and speed, with minimum output power levels dependent on aircraft capabilities.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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