{"id":"F2006B02980","name":"AD/B737/79 - Main Rudder Power Control Unit (PCU)","slug":"ad-b737-79-main-rudder-power-control-unit-pcu","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42339,"registerId":"commonwealth-F2006B02980-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/79 - Main Rudder Power Control Unit (PCU)","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 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Boeing 737 Series Aeroplanes\n\n \n\nAD/B737/79 Main Rudder Power Control Unit (PCU) 5/94\n\nApplicability: Model 737 series, line position 1 through 2453 inclusive.\n\n \n\nRequirement: Action in accordance with the technical requirements of FAA AD 94-01-07 Amdt 39- 8789.\n\n \n\nNote: Boeing SL 737-SL-27-82-B and SB 737-27-1185 refer.\n\n \n\nCompliance: As specified in the requirement document with a revised effective date of 30 April 1994.\n\n \n\nBackground: Reports of excessive internal leakage in the rudder PCU which could result in reduced controllability of the aircraft have been reported.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1625},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope: addressing the specific reported safety defect (internal leakage) in the rudder PCU of affected Boeing 737 aircraft. It has not expanded beyond this specific airworthiness issue."},"complexity_factors":["Single-issue directive focused on one mechanical component","Technical requirements incorporated by reference to external FAA document (AD 94-01-07)","Simple applicability test based on production line numbers (1-2453)","No defined terms section or nested conditional provisions"],"plain_english_summary":"This AD mandates that owners/operators of Boeing 737s (production line numbers 1–2453) inspect, test, repair or replace the Main Rudder Power Control Unit per FAA AD 94-01-07 because internal PCU leaks can reduce or prevent rudder control. It affects all operators of the specified aircraft; technical guidance is in Boeing Service Letter 737-SL-27-82-B and Service Bulletin 737-27-1185. Compliance was required by 30 April 1994."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-79-main-rudder-power-control-unit-pcu","history":"/api/acts/ad-b737-79-main-rudder-power-control-unit-pcu/history","analysis":"/api/acts/ad-b737-79-main-rudder-power-control-unit-pcu/analysis","conflicts":"/api/acts/ad-b737-79-main-rudder-power-control-unit-pcu/conflicts","importantCases":"/api/acts/ad-b737-79-main-rudder-power-control-unit-pcu/important-cases","documents":"/api/acts/ad-b737-79-main-rudder-power-control-unit-pcu/documents"}}