{"id":"F2006B08900","name":"AD/DH 82/2 Amdt 1 - Fuel Cock Control Lever - Modification","slug":"ad-dh-82-2-amdt-1-fuel-cock-control-lever-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52412,"registerId":"commonwealth-F2006B08900-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH 82/2 Amdt 1 - Fuel Cock Control Lever - Modification","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)  \nDH 82 (Tiger Moth) Series Aeroplanes\n\nAD/DH 82/2\n\nAmdt 1\n\n  \nFuel Cock Control Lever \\- Modification 5/99\n\nApplicability: DH 82, DH82A Tiger Moth and Queen Bee aircraft.\n\nRequirement: Unless already previously accomplished, modify the fuel cock control (rear cockpit) to ensure positive locking in the “ON” position and to allow rapid movement of the lever to the “OFF” position in the event of an emergency. The recently issued British Aerospace Modification Moth 155 meets the requirement of this Directive.\n\nCompliance: Within 25 hours of the effective date of this directive. This Amendment becomes effective on 20 May 1999.\n\nBackground: During investigation of a recent accident involving a Tiger Moth in UK, the investigating authority recommended that provision be made for positive locking of the fuel cock lever. AD/DH82/2 was issued in 1984 to achieve this, however the requirement documents quoted at the time are now out of date. This amendment is to incorporate the recently issued BAe Modification on the matter.\n\nThe original issue of this Airworthiness Directive became effective on 28 November 1958.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The amendment updates the prescribed method for achieving the original safety objective by incorporating BAe Modification Moth 155, but does not expand the set of affected aircraft or alter the core requirement to provide positive locking and rapid shut‑off (Requirement, Applicability, Background). Compliance timing remains enforced (Compliance)."},"complexity_factors":["Narrow applicability to specific aircraft models (Applicability).","Technical safety modification required: positive locking and rapid-off action for fuel cock (Requirement).","Short compliance window: within 25 hours of effective date creates operational time pressure (Compliance).","Dependence on an external technical document as an acceptable method (BAe Modification Moth 155) (Requirement, Background).","Obligation falls to aircraft owners/operators to implement the change, implying costs, downtime and need for qualified maintenance (Requirement, Compliance).","Regulatory history noted (original 1958 AD and 1984 AD) but amendment updates method rather than broadening scope (Background)."],"plain_english_summary":"Modifies the rear‑cockpit fuel cock control on DH 82, DH82A Tiger Moth and Queen Bee aircraft so the lever positively locks in “ON” and can be moved rapidly to “OFF” in an emergency. Owners/operators must carry out the modification within 25 hours of the directive’s effective date (20 May 1999). The amendment accepts British Aerospace Modification Moth 155 as a compliant fix. The measure is presented as a safety response to a UK accident (Requirement, Compliance, Applicability)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original 1984 safety intent (positive fuel cock locking) while simply updating the technical reference to a current manufacturer modification. The scope remains tightly focused on the single safety issue identified in the UK accident investigation."},"complexity_factors":["Single, specific mechanical modification with clear technical reference (BAe Mod Moth 155)","Only one defined applicability group (DH 82 series aircraft)","Simple compliance condition: 'unless already previously accomplished'","No nested exceptions, cross-references to other legislation, or conditional logic","Straightforward time-based compliance (25 hours time-in-service)","Background explanation provided in plain narrative form"],"plain_english_summary":"Owners/operators of DH.82 Tiger Moth and Queen Bee aircraft must fit a modification to the rear cockpit fuel-cock control so it positively locks in ON and allows rapid shut‑off, following British Aerospace Modification Moth 155. \n\nCASA issued this mandatory AD after a UK accident found inadvertent fuel‑cock movement could cut fuel or prevent shutoff; the change replaces outdated references. Work must be done within 25 flying hours after 20 May 1999."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh-82-2-amdt-1-fuel-cock-control-lever-modification","history":"/api/acts/ad-dh-82-2-amdt-1-fuel-cock-control-lever-modification/history","analysis":"/api/acts/ad-dh-82-2-amdt-1-fuel-cock-control-lever-modification/analysis","conflicts":"/api/acts/ad-dh-82-2-amdt-1-fuel-cock-control-lever-modification/conflicts","importantCases":"/api/acts/ad-dh-82-2-amdt-1-fuel-cock-control-lever-modification/important-cases","documents":"/api/acts/ad-dh-82-2-amdt-1-fuel-cock-control-lever-modification/documents"}}