Airworthiness directives › 2004-08-16
AD 2004-08-16 Airworthiness Directives; NARCO Avionics Inc. AT150 Transponders
Applicability*9
This AD applies to NARCO Avionics Inc. AT150 transponders with “Chassis Level A”, serial numbers (SNs) 10000 through 12598 inclusive.
Compliance
Compliance with this AD is required as indicated, unless already done. Transponders Not Modified in Accordance With Service Bulletin AT150 No. 1 (f) For AT150 transponders with a SN listed in this AD that are not modified in accordance with NARCO service bulletin (SB) No. AT150 No. 1, dated July 29, 1977, within six months after the effective date of this AD, do the following: (1) Install resistor part number (P/N) 312180102 and transistor P/N 755610028; and (2) Change transponder to “Chassis Level B”; and (3) Test transponders in accordance with the Corrective Action, Testing the Modification, and Return to Service paragraphs of NARCO SB No. AT150 No. 6, dated January 31, 2003. Transponders Modified in Accordance With Service Bulletin AT150 No. 1 (g) For AT150 transponders with a SN listed in this AD, that are modified in accordance with NARCO SB No. AT150 No. 1, dated July 29, 1977, do the following: (1) Within six months after the effective date of this AD, change transponder to “Chassis Level B”; and (2) Test transponders in accordance with the Testing the Modification paragraph of NARCO SB No. AT150 No. 6, dated January 31, 2003; and (3) Perform a bench test to the transponder before returning it to service. Information on bench testing can be found in AT150 Manual P/N 03606-0600. Alternative Methods of
Unsafe condition
This AD results from reports of AT150 transponders not recognizing and responding properly to Mode S interrogations from Mode S ground stations and Traffic Alert and Collision Avoidance System (TCAS-II) airborne equipment. The actions specified in this AD are intended to prevent loss of aircraft airspace separation and the possibility of mid-air collision.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1