Commonwealth legislation

AD/RAD/63 - KT 76A ATC Transponder

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

This Airworthiness Directive requires replacing two resistor network modules (RM401 and RM402) in AlliedSignal KT 76A ATC transponders (specified part and serial number ranges) with glass‑coated parts under AlliedSignal Service Bulletin SB KT 76A‑7 (Mod 7). It applies to affected units before installation in an aircraft or by 10 September 1999 and became effective 10 September 1998. The FAA advised these transponders can transmit misleading encoded altimeter information; the directive therefore imposes parts-and-labour compliance costs on owners/operators and a firm deadline to follow the manufacturer’s modification procedure.

JSON API

Deep dive

Want the full deep dive?

Zoe can write the in-depth analysis on top of the summary above: how it works, who it affects and what each part actually does.

Current sections

Direct links to the current provisions in AD/RAD/63 - KT 76A ATC Transponder.

AD/RAD/63 - KT 76A ATC Transponder

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
Radio Communication and Navigation Equipment

AD/RAD/63 KT 76A ATC Transponder 10/98

Applicability: AlliedSignal KT 76A Air Traffic Control (ATC) Transponders, part numbers 066- 1062-00, -10 and -02 with serial numbers 93,000 through 109,999 inclusive.

Note: These transponders are known to be installed on, but not limited to, the following series of aircraft:

Manufacturer Aircraft Series

Cessna Aircraft Company 172, 182, T182, R182, 206, P206, U206, TP206, 210, T210, P210, 310, E310,

T310 and 421

Twin Commander Aircraft Company 500, 520, 560, 680, 681, 685, 690, 695

and 720

The New Piper Aircraft Corporation (formerly known as Piper Aircraft Corporation)

Raytheon Aircraft Corporation (formerly known as Beech Aircraft Corporation)

PA-31, PA-32 and PA-34

E33, F33, G33, 35, J35, K35, L35, M35, P35, S35, V35, 36, A26, B36, D55, E55, 56, A56, 58, 58A, 95, B95, D95 and E95

Mooney Aircraft Corporation M20 McDonnell Douglas Helicopter Company 500N

Requirement: Replace the two resistor network modules, RM401 and RM402, with new glass- coated parts in accordance with the ‘Modification Procedure’ section of AlliedSignal Service Bulletin SB KT 76A-7 dated July 1996. (When accomplished, this replacement is referred to as Mod 7.)

Note: FAA AD 98-14-03 Amdt 39-10637 refers.

Compliance: Prior to installation in an aircraft, but no later than 10 September 1999. This Airworthiness Directive becomes effective on 10 September 1998.

Background: The FAA has advised that KT 76A ATC transponders have been identified as transmitting misleading encoding altimeter information to ground-based ATC radar sites and proximate Traffic Alert and Collision Avoidance System (TCAS) equipped aircraft. The actions specified by this directive are intended to prevent the transmission of misleading encoding altimeter information from affected aircraft.

Source text

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

1 AD/RAD/63 - KT 76A ATC Transponder