{"id":"F2006B10921","name":"AD/JETSTREAM/51 Amdt 1 - Hydraulic Power Emergency Selector Valve","slug":"ad-jetstream-51-amdt-1-hydraulic-power-emergency-selector-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56464,"registerId":"commonwealth-F2006B10921-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/51 Amdt 1 - Hydraulic Power Emergency Selector Valve","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBritish Aerospace BAe 3100 (Jetstream) Series Aeroplanes\n\nAD/JETSTREAM/51\n\nAmdt 1\n\n  \nHydraulic Power Emergency Selector Valve 6/92\n\nApplicability: All Model HP137 Mk 1, Jetstream Series 200, 3100 and 3200 Series aircraft.\n\nRequirement: Action in accordance with the Technical Requirements of British Aerospace Service Bulletin, CAA (UK) mandatory, 29-JA 901242 Revision 1 dated 25 September 1991.\n\nNote: FAA AD 92-07-04 amdt 39-8200 refers.\n\nCompliance: Required at next 1800 hour scheduled inspection, or by 31 August 1992, which ever occurs first\n\nBackground: Operators have reported cases of an excessive load required to operate the flaps and main landing gear emergency selector valve handle on in-service aircraft. Failure of the emergency selector valve would result in the flight crew being unable to use the emergency hydraulic system to lower the flaps and landing gear. This amendment has been raised to add the HP137 and 200 series aircraft and the FAA AD reference to the directive.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"The amendment explicitly expands the original directive's scope to include additional aircraft models (HP137 Mk 1 and Jetstream Series 200) that were not covered in the original version, plus adds a reference to the corresponding FAA directive."},"complexity_factors":["Single, specific technical requirement referencing an external service bulletin","Clear applicability clause listing affected aircraft models","Simple binary compliance deadline (whichever occurs first)","No defined terms section","No nested exceptions or conditional logic","Straightforward background explanation without legal cross-references"],"plain_english_summary":"This AD mandates inspection and corrective action on the hydraulic power emergency selector valve for certain British Aerospace Jetstream/HP137 aircraft because the emergency handle can become too stiff to operate, risking inability to lower flaps/gear in a hydraulic failure. Affects HP137 Mk 1, Jetstream Series 200, 3100 and 3200 operators; work must follow BA Service Bulletin 29-JA 901242 Rev 1 by the next 1,800‑hour check or 31 Aug 1992. Amendment 1 expands coverage and aligns with the FAA."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment expands the directive's applicability to include HP137 Mk 1 and Jetstream Series 200 aircraft and adds a cross‑reference to the FAA AD; the core requirement remains to carry out actions in the specified BAe service bulletin to address excessive selector‑valve operating loads (Background, Applicability, Requirement)."},"complexity_factors":["Cross-reference to an external mandatory manufacturer service bulletin (Requirement) increases dependency on technical instructions from British Aerospace.","Applicability spans multiple aircraft models (Applicability), requiring operators with different fleets to check applicability and fleet scheduling.","Dual compliance trigger: next 1800‑hour scheduled inspection OR a fixed calendar date (Compliance) creates scheduling and tracking obligations.","Technical inspection and potential corrective work impose parts, labour and downtime costs on operators (Background/Requirement).","Inclusion of an FAA AD reference adds an international regulatory cross‑check but no separate domestic procedure."],"plain_english_summary":"The directive requires inspection and, if needed, corrective work on the hydraulic emergency selector valve per British Aerospace Service Bulletin CAA (UK) mandatory 29‑JA 901242 Rev 1. It covers HP137 Mk 1 and Jetstream Series 200, 3100 and 3200 aircraft and must be completed at the next 1800‑hour inspection or by 31 August 1992, whichever comes first.\n\nOperators pay for parts, labour and downtime; CASA enforces compliance. The stated safety purpose is to ensure the emergency hydraulic system can lower flaps and landing gear."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-51-amdt-1-hydraulic-power-emergency-selector-valve","history":"/api/acts/ad-jetstream-51-amdt-1-hydraulic-power-emergency-selector-valve/history","analysis":"/api/acts/ad-jetstream-51-amdt-1-hydraulic-power-emergency-selector-valve/analysis","conflicts":"/api/acts/ad-jetstream-51-amdt-1-hydraulic-power-emergency-selector-valve/conflicts","importantCases":"/api/acts/ad-jetstream-51-amdt-1-hydraulic-power-emergency-selector-valve/important-cases","documents":"/api/acts/ad-jetstream-51-amdt-1-hydraulic-power-emergency-selector-valve/documents"}}