Commonwealth legislation

AD/RAD/54 - Terra Transponders

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Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

4/10 complexity

This Directive, issued under the Civil Aviation Regulations, requires operators of specified Terra TRT‑250 transponders (listed by model, part number, serial number ranges and modification levels) to have those units modified in accordance with Terra Service Bulletin ISB‑004 (20 July 1995). The Civil Aviation Safety Authority mandates completion before 30 September 1996.

Purpose: The mandated modification fixes an identified incompatibility with TCAS II that may prevent the transponders responding to TCAS II interrogations and could reduce airspace separation.

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AD/RAD/54 - Terra Transponders

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Radio Communication and Navigation Equipment

AD/RAD/54 Terra Transponders 10/95

Applicability: This Directive is applicable to the following Terra Corporation Air Traffic Control Transponders:

All push-button Model TRT 250 Part Number (P/N) 0900-0250-00 with Serial Numbers 4194 and below, modification level 4 and below, and

b. All push-button three inch ATI mounted Model TRT 250 P/N 0900-0250-20 with Serial Numbers 5324 and below, modification level 4 and below, and

c. All digital display Model TRT 250 D P/N 0900-0250-30 with Serial Numbers 1155 and below, modification levels 1 and below.

Requirement: Modify the transponder in accordance with Terra Corporation International Service Bulletin ISB-004 dated 20 July 1995.

Note: FAA AD 95-01-01 Amdt 39-9112 refers.

Compliance: Prior to 30 September 1996.

Background: Terra Corporation has advised that the Traffic Alert Collision Avoidance System (TCAS II) is incompatible with certain Terra transponders and that the transponders may not respond to TCAS II interrogations. This incompatibility could result in a loss of airspace separation between aircraft. This Directive mandates a modification that ensures that the affected transponders respond to TCAS II interrogations.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/RAD/54 - Terra Transponders