AMC1 ACNS.D.AC.015 Data transmission
ED Decision 2013/031/R
(a) Mode A Code verifications.
(1) Set the Mode A code to 7776 (or other Mode A code agreed with the local Air Traffic Control Unit) through the dedicated flight crew interface. Confirm receipt of correct code by using ground test equipment.
(2) For dual transponder installation with a common control panel, set the Mode A code to 7776 (or other Mode A code agreed with the local Air Traffic Control Unit) and verify that the correct code is received by the ground test equipment. Switch to transponder 2 and verify that the correct Mode A code is received by the ground test equipment.
Note: Agreement of Mode A code values is to be agreed with
the local ATC if the transponder is in the visibility of an ATC cooperative
surveillance system.
(b) Pressure Altitude verifications
(1) Verify that all Mode A/C transponders report the pressure-altitude encoded in the information pulses in Mode C replies.
Note: more details on the encoding of the altitude can be
found in ICAO Annex 10, Vol IV, para 3.1.2.6.5.4.
(2) Select the altitude switch to the ON position and verify that the transponder provides the current aircraft altitude in response to Mode C interrogations.
(3) A sufficient number of test points should be checked to ensure that the altitude reporting equipment and transponder perform their intended function through their entire range while ascending or descending. Where a Gillham altitude encoder is used, tests of each altitude code segment of the encoder (2300, 2500, 3800, 4300, 4800, 6800, 14800 30800, 70800, 90800, 110800 and 126700 if available) should be sufficient to ensure proper operation of each altitude code segment of the encoder.
Loading collections...