{"id":"F2006B06575","name":"AD/REC/4 - Fairchild Model F800 Digital Flight Data Recorders Central Processor Unit","slug":"ad-rec-4-fairchild-model-f800-digital-flight-data-recorders-central-processor-unit","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48354,"registerId":"commonwealth-F2006B06575-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/REC/4 - Fairchild Model F800 Digital Flight Data Recorders Central Processor Unit","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nCockpit Voice and Flight Data Recording Systems\n\nAD/REC/4 Fairchild Model F800 Digital Flight Data\n\nRecorders Central Processor Unit\n\n  \n9/94\n\nApplicability: 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):\n\nPart Number Serial Number\n\n17-M303-XXX 04373 and subsequent\n\n17-M600-XXX 04091 and subsequent\n\n17M603-XXX 06646, 06651 and subsequent\n\n17M604-XXX 04091 and subsequent\n\n17M700-XXX 02151 and subsequent\n\n17M703-XXX 02148, 05414, 05466, 05468, 05470 and subsequent\n\n17M800-XXX 05025, 05027, 05029, 05032, 05034 to 05038 inclusive,\n\n05040 to 05042 inclusive, 05044 and subsequent\n\n17M900-XXX 00783 and subsequent\n\n17M903-XXX 04753 to 04755 inclusive, 06637, 06651 and subsequent Requirement: Action in accordance with Loral Data Systems, Fairchild Aviation Recorders\n\nBulletin DFR 027 (F800-31-027 Rev 2).\n\nNote: This modification has been classified as Mandatory by the Bureau of Air Safety Investigation, Department of Transport and Communications.\n\nCompliance: Prior to 31 August 1995 or at the next shop visit for maintenance, whichever occurs earlier.\n\nBackground: 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.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2430},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This maintains its original narrow, technical scope as a safety-critical hardware rectification directive targeting a specific known defect in identified aviation equipment. No expansion beyond the original airworthiness safety purpose is evident."},"complexity_factors":["Nine separate part number categories with distinct serial number exemption ranges","Reference to external technical document (Manufacturer Bulletin DFR 027) without reproducing the actual procedural steps","Technical aviation terminology (DFDR, Central Processor Unit, printed wiring assembly) requiring specialized domain knowledge"],"plain_english_summary":"This directive mandates repairs to certain Fairchild F800 flight data recorders because a faulty CPU component can produce wrong navigation data or fail without warning, risking loss of critical accident evidence. It applies to operators of affected F800 units with specified part/serial ranges and requires following the manufacturer's bulletin by the deadline or at the next workshop visit. Ensuring these fixes preserves reliable flight-data for investigations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rec-4-fairchild-model-f800-digital-flight-data-recorders-central-processor-unit","history":"/api/acts/ad-rec-4-fairchild-model-f800-digital-flight-data-recorders-central-processor-unit/history","analysis":"/api/acts/ad-rec-4-fairchild-model-f800-digital-flight-data-recorders-central-processor-unit/analysis","conflicts":"/api/acts/ad-rec-4-fairchild-model-f800-digital-flight-data-recorders-central-processor-unit/conflicts","importantCases":"/api/acts/ad-rec-4-fairchild-model-f800-digital-flight-data-recorders-central-processor-unit/important-cases","documents":"/api/acts/ad-rec-4-fairchild-model-f800-digital-flight-data-recorders-central-processor-unit/documents"}}