1AD/REC/4 - Fairchild Model F800 Digital Flight Data Recorders Central Processor Unit

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Cockpit Voice and Flight Data Recording Systems

AD/REC/4 Fairchild Model F800 Digital Flight Data

Recorders Central Processor Unit

9/94

Applicability: All Fairchild Model F800 Digital Flight Data Recorders (DFDR), all part numbers, with the exception of DFDRs with serial numbers listed below (X indicates any numeral):

Part Number Serial Number

17-M303-XXX 04373 and subsequent

17-M600-XXX 04091 and subsequent

17M603-XXX 06646, 06651 and subsequent

17M604-XXX 04091 and subsequent

17M700-XXX 02151 and subsequent

17M703-XXX 02148, 05414, 05466, 05468, 05470 and subsequent

17M800-XXX 05025, 05027, 05029, 05032, 05034 to 05038 inclusive,

05040 to 05042 inclusive, 05044 and subsequent

17M900-XXX 00783 and subsequent

17M903-XXX 04753 to 04755 inclusive, 06637, 06651 and subsequent Requirement: Action in accordance with Loral Data Systems, Fairchild Aviation Recorders

Bulletin DFR 027 (F800-31-027 Rev 2).

Note: This modification has been classified as Mandatory by the Bureau of Air Safety Investigation, Department of Transport and Communications.

Compliance: Prior to 31 August 1995 or at the next shop visit for maintenance, whichever occurs earlier.

Background: Loral Data Systems has reported that there have been cases of erroneous track changes which have been isolated to a component on the Central Processor Unit printed wiring assembly and that the component may also prematurely fail when power is applied to the DFDR, these faults may also remain undetected. Compliance with this Directive will ensure that faults are detected and information critical to the investigation of an accident or incident is not lost.