{"id":"F2006B06509","name":"AD/RAD/52 - Rockwell International, Collins Air Transport Division DME-700","slug":"ad-rad-52-rockwell-international-collins-air-transport-division-dme-700","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48089,"registerId":"commonwealth-F2006B06509-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/RAD/52 - Rockwell International, Collins Air Transport Division DME-700","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Radio Communication and Navigation Equipment\n\n \n\n# AD/RAD/52 Rockwell International, Collins Air Transport Division DME-700\n\nApplicability: Rockwell International, Collins Air Transport Division, DME- 700 Distance Measuring Equipment, all serial numbers, with the following part numbers:\n\n# 4/94\n\n \n\n622-4540-020, 622-4540-021, 622-4540-022, 622-4540-120, and 622-4540-121.\n\n \n\nNote: These equipments are known to be installed on, but not limited to the following aircraft series:\n\nAirbus Industrie A300, A310, A300-600, A320 and A340 Boeing  737, 747-400, and 767\n\nFokker F-100\n\nMcDonnell Douglas MD-11 and MD-80\n\n \n\nRequirement: Unless previously accomplished, incorporate Collins Air Transport Division Service Bulletins in accordance with the following Table:\n\n \n\n| Collins SB | Dated | Applicable DME-700 Part Numbers |\n| --- | --- | --- |\n| SB 20 Revision 1 | 30 August 1991 | 622-4540-020 and -120, with serial<br>numbers 1 through 4247 inclusive. |\n| SB 25 | 11 November 1992 | 622-4540-020,, -021 and -022. SB 20<br>Revision 1 must be installed on applicable part numbers, prior to, or in conjunction with SB 25. SB 24 is incorporated by SB 25. |\n| SB 26 | 21 October 1992 | 622-4540-120 and -121. SB 20 Revision 1 must be incorporated in applicable part numbers, prior to, or in conjunction with SB 25. SB 26 eliminates the requirement for SB 21. |\n\n\n \n\nNote: FAA AD 94-02-02 Amdt 39-8799 refers.\n\n \n\nCompliance: Prior to 31 March 1995.\n\n \n\nBackground: Several operators have reported random instances of erroneous DME indications, the affected units failing to process and update distance outputs. Additionally, some units have been reported as establishing a continuous restart mode upon application of power. These conditions are known colloquially as `sleeping’ or `deaf’ modes of operation. Compliance with this Directive will effectively prevent units from displaying these characteristics.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive, as written, confines action to DME‑700 units with the listed part numbers/serial ranges and requires incorporation of named Service Bulletins by the compliance date. The text does not expand applicability beyond those units or add discretionary exemptions; no change from the instrument's apparent original scope is evident in the supplied text."},"complexity_factors":["Multiple Collins Service Bulletins required, with SB20 as a prerequisite for others","Applicability limited by specific part numbers and a serial-number range (serials 1–4247 for some parts)","Cross-references between SBs (e.g. SB24 incorporated by SB25; SB26 eliminates SB21) create sequencing constraints","Compliance deadline imposes scheduling and operational downtime costs","Reference to FAA AD 94-02-02 Amdt 39-8799 introduces an external regulatory cross-check"],"plain_english_summary":"This airworthiness directive requires operators to update Rockwell/Collins DME‑700 distance measuring units with the listed part numbers and serial ranges by installing specified Collins Service Bulletins (including the prerequisite SB20) by 31 March 1995. The Civil Aviation Safety Authority issues the mandate; aircraft operators and maintenance organisations must perform the modifications, bearing inspection, parts, labour and downtime costs. The stated purpose is to prevent intermittent ‘sleeping’ or ‘deaf’ DME behaviour that causes erroneous or frozen distance indications."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive for a specific avionics unit. It has not expanded beyond its original purpose of addressing the 'sleeping/deaf' mode defect in DME-700 equipment."},"complexity_factors":["Single, specific equipment type with clearly enumerated part numbers (5 variants)","Straightforward compliance table with only 3 service bulletin paths","No nested conditional logic — each part number maps to a clear action","Single deadline with no phased compliance or flight hour thresholds","Minimal cross-referencing (only one FAA AD reference for background)","Short document (~250 words) with clear 'Applicability/Requirement/Compliance/Background' structure"],"plain_english_summary":"This AD mandates that operators of Rockwell Collins DME-700 distance‑measuring units (part numbers 622‑4540‑xxx) install specified software or hardware updates to fix “sleeping” or “deaf” failures that can stop or freeze distance indications. It affects aircraft fitted with these modules (common on Airbus, Boeing, Fokker and MD types) and addresses a safety risk to navigation and approaches; compliance was required by 31 March 1995."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rad-52-rockwell-international-collins-air-transport-division-dme-700","history":"/api/acts/ad-rad-52-rockwell-international-collins-air-transport-division-dme-700/history","analysis":"/api/acts/ad-rad-52-rockwell-international-collins-air-transport-division-dme-700/analysis","conflicts":"/api/acts/ad-rad-52-rockwell-international-collins-air-transport-division-dme-700/conflicts","importantCases":"/api/acts/ad-rad-52-rockwell-international-collins-air-transport-division-dme-700/important-cases","documents":"/api/acts/ad-rad-52-rockwell-international-collins-air-transport-division-dme-700/documents"}}