1AD/RAD/51 - Rockwell International/Collins Aviation Division TDR-94D Transponder

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/51 Rockwell International/Collins Aviation

Division TDR-94D Transponder

6/93

Applicability: Rockwell International/Collins Aviation Division TDR-94D Mode S Transponders installed on, but not limited to, the following airplanes:

Saab 340A and 340B, Short Brothers SD3-60,

de Havilland DHC-8 series, Grumman Gulfstram G1159 series,

Dassault Mystere-Falcon 200 and 900, Canadair Challenger CL-601 series, British Aerospace HS 125-700 series, and Beechcraft 300 series.

Requirement: 1. Fabricate a placard with the following words in letters at least 25mm in height and install the placard within the pilot’s clear view on the instrument panel:

`OPERATION OF TCAS II IN ANY MODE OTHER THAN THE “TA ONLY” MODE IS PROHIBITED’

2. Modify the software of the transponder in accordance with the Accomplishment Instructions of Collins Service Bulletin TDR-94/94D-34-6 Revision 2 dated

21 September 1992. (The placard mandated by Requirement 1 is no longer necessary after this Modification is incorporated.)

Note: FAA AD 93-04-02 Amendment 39-8504 refers.

Compliance: Requirement 1 - Prior to 7 June 1993.

Requirement 2 - Prior to 1 December 1993.

Background: Tests have revealed that these Mode S Transponders, when operating in the resolution advisory mode, may loose the capability of co-ordinating with other aircraft. This could result in a near-hit situation or mid-air collision. Compliance with this Directive is intended to prevent collisions or near hits caused by failure of these Mode S Transponders.