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Notice of Proposed Rule Making - NPRM 1001OS

 Proposed Amendment to an Airworthiness Directive (AD) Requiring Additional Maintenance to Aircraft Transponder Systems

Objectives

To ensure that transponders fitted to Australian registered aircraft are capable of achieving the performance standards to which they were certified.

Key change proposals

Amend AD/RAD/47 Amdt 1 to include the following tests needed to confirm the correct functioning of the transponder and initiate maintenance action as appropriate:

  • Using a suitable transponder test set, ensure that:
    • the duration of all reply pulses (pulse width) is between 0.35 and 0.55
      microseconds;
    • the rise time of all reply pulses (0.1 of pulse amplitude to 0.9 of pulse amplitude)
      is 0.05 to 0.1 microseconds;
    • the decay time of all reply pulses (0.9 of pulse amplitude to 0.1 of pulse
      amplitude) is 0.05 to 0.20 microseconds; and
    • the amplitude variation between one reply pulse and any other reply pulse is not
      greater than 1 dB.

How to respond

Comment period now closed

Additional information

Contact Charles Lenarcic, Project Leader
email charles.lenarcic@casa.gov.au