{"id":"F2006B10911","name":"AD/JETSTREAM/42 - Hydraulic Power - Emergency Hydraulic Hand Pump","slug":"ad-jetstream-42-hydraulic-power-emergency-hydraulic-hand-pump","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56450,"registerId":"commonwealth-F2006B10911-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/42 - Hydraulic Power - Emergency Hydraulic Hand Pump","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)  British Aerospace BAe 3100 (Jetstream) Series Aeroplanes\n\n \n\nAD/JETSTREAM/42 Hydraulic Power - Emergency\n\nHydraulic Hand Pump\n\n\n4/91 DM\n\n \n\nApplicability: Jetstream Series 3100 Aircraft construction number 601 to 646, 648 to 655, 658 and\n\n660.\n\n \n\nRequirement: Inspect and/or modify subject aircraft in accordance with British Aerospace Service Bulletin, CAA (UK) Mandatory, 29-JM 7360 Revision 1.\n\n \n\nCompliance: As specified in the Requirement Document but with a revised effectivity date of 18 April 1991 for Australian registered aircraft.\n\n \n\nBackground: Cases have been reported of difficulty in gaining access to the emergency hydraulic hand-pump following hydraulic systems failures.\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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive targeting a specific mechanical issue on specific aircraft. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (under 200 words)","Only 1 defined applicability range (specific aircraft serial numbers)","Single requirement referencing an external technical document","No nested conditions or exceptions","No cross-references to other legislation or regulations","Straightforward compliance deadline"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for specific British Aerospace Jetstream 3100 aircraft.\n\n**What it does:**\n- Requires owners/operators of certain Jetstream aircraft (construction numbers 601-646, 648-655, 658, and 660) to inspect and potentially modify the emergency hydraulic hand-pump\n- The work must follow British Aerospace Service Bulletin 29-JM 7360 Revision 1\n- Australian-registered aircraft must complete this by **18 April 1991**\n\n**Why it matters:**\nPilots were having trouble reaching the emergency hydraulic hand-pump during system failures. Since this pump is critical for controlling the aircraft if the main hydraulics fail, the difficulty posed a serious safety risk. This directive ensures the pump is accessible in emergencies.\n\n**Who it affects:**\nOperators of specific Jetstream 3100 aircraft registered in Australia."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The AD revises the effectivity date for Australian-registered aircraft to 18 April 1991 (Compliance), which alters when the obligation for those aircraft takes effect relative to the referenced Requirement Document. The AD also limits its application to a defined set of Jetstream 3100 construction numbers (Applicability), so the instrument applies only to those serial-numbered aircraft rather than the entire type."},"complexity_factors":["Dependence on external technical documents (British Aerospace Service Bulletin and CAA (UK) Mandatory 29-JM 7360 Revision 1) for the substantive steps required (Requirement).","Limited applicability by specific construction numbers requires operators to check aircraft serials to determine applicability (Applicability).","Compliance timing is altered for Australian-registered aircraft, creating an administrative tracking requirement (Compliance).","The AD prescribes an action (inspect/modify) but does not include technical details in the AD text itself, forcing users to obtain and follow the referenced documents (Requirement).","Operational impacts (downtime, parts, labour) are not quantified in the AD, requiring case-by-case planning by owners/operators (Requirement; Background).","Cross-reference to UK CAA and manufacturer documents introduces minor cross-jurisdictional administrative coordination for Australian operators (Requirement)."],"plain_english_summary":"What this instrument does (mechanics)\n\n- This Airworthiness Directive (AD) requires owners/operators of certain British Aerospace Jetstream 3100 series aeroplanes to inspect and, if necessary, modify the aircraft so that the emergency hydraulic hand pump can be accessed after a hydraulic system failure. The AD orders that the work be done in accordance with a specified British Aerospace Service Bulletin and the CAA (UK) Mandatory document 29-JM 7360 Revision 1 (Requirement).\n\nWho it affects\n\n- Applies only to Jetstream Series 3100 aircraft with construction numbers 601–646, 648–655, 658 and 660 (Applicability). That list defines which individual aircraft must comply.\n\nWho decides and what they must follow\n\n- The AD itself (issued under Commonwealth rules) sets the legal obligation for Australian-registered aircraft and refers the technical steps to the British Aerospace Service Bulletin and the UK CAA Mandatory document (Requirement). The AD also sets a specific effective date for Australian-registered aircraft: 18 April 1991 (Compliance).\n\nWhy it was issued (stated purpose)\n\n- The Background records that there have been reported cases where crews/operators had difficulty gaining access to the emergency hydraulic hand-pump after hydraulic system failures. The AD’s stated purpose is to inspect/modify affected aircraft to address that access problem (Background; Requirement).\n\nPractical effects, who pays, and incentives\n\n- Owners/operators of the listed Jetstream 3100 aircraft bear the direct cost and time of carrying out the required inspections and modifications (Applicability; Requirement). They can perform the work themselves if suitably approved, or contract licensed maintenance organisations to do it; the AD itself points to the Service Bulletin as the specification for the work (Requirement).\n\n- By mandating a specific Service Bulletin and CAA Mandatory document, the AD restricts how operators can meet the requirement: compliance must follow those documents rather than operator-devised solutions (Requirement). The Compliance paragraph establishes that the AD’s effective date for Australian aircraft is 18 April 1991, which fixes when the obligation applies (Compliance).\n\nCompliance burden, implementation risk and trade-offs\n\n- The compliance burden is operational and financial: obtaining the Service Bulletin, scheduling maintenance downtime, acquiring parts or labour, and documenting completion per regulatory practice. The AD does not state time or cost estimates; those will depend on the aircraft condition and the content of the referenced Service Bulletin (Requirement).\n\n- The implementation risk the AD addresses (reported difficulty accessing the emergency hand pump after hydraulic failures) is described in the Background. The AD does not itself quantify reduced risk after compliance; it mandates the inspection/modification to reduce the operational problem reported (Background; Requirement).\n\nEffects on market participants and private choice\n\n- The AD creates demand for the specific maintenance task for the identified aircraft. Independent maintenance organisations capable of performing the Service Bulletin work can be contracted by owners/operators; owners/operators must either allocate their own approved maintenance resources or procure them externally (Applicability; Requirement).\n\n- The AD constrains operator discretion on how to comply (they must follow the specified Service Bulletin/CAA Mandatory document), which channels compliance through the manufacturer/CAA-prescribed method (Requirement).\n\nSummary statement\n\n- In short, the AD legally obliges certain Jetstream 3100 aircraft to be inspected and modified in a specified way to improve access to the emergency hydraulic hand pump following reported access problems. The cost, scheduling and performance decisions fall on the aircraft owners/operators, who must follow the referenced Service Bulletin and CAA Mandatory document and comply by the amended effective date for Australian-registered aircraft (Applicability; Requirement; Compliance; Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-42-hydraulic-power-emergency-hydraulic-hand-pump","history":"/api/acts/ad-jetstream-42-hydraulic-power-emergency-hydraulic-hand-pump/history","analysis":"/api/acts/ad-jetstream-42-hydraulic-power-emergency-hydraulic-hand-pump/analysis","conflicts":"/api/acts/ad-jetstream-42-hydraulic-power-emergency-hydraulic-hand-pump/conflicts","importantCases":"/api/acts/ad-jetstream-42-hydraulic-power-emergency-hydraulic-hand-pump/important-cases","documents":"/api/acts/ad-jetstream-42-hydraulic-power-emergency-hydraulic-hand-pump/documents"}}