{"id":"F2006B03521","name":"AD/BAe 146/74 - Powerplant Firewire Responder Units","slug":"ad-bae-146-74-powerplant-firewire-responder-units","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43088,"registerId":"commonwealth-F2006B03521-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BAe 146/74 - Powerplant Firewire Responder Units","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 146 Series Aeroplanes\n\nAD/BAe 146/74 Powerplant Firewire Responder Units 4/99\n\nDM\n\nApplicability: All BAe 146 100, 200, 300 Series aeroplanes and all Avro 146-RJ70, 85, 100 Series aeroplanes; without modification HCM01638A or British Aerospace Regional Aircraft BAe 146 Service Bulletin (SB) 26-44-01638A incorporated.\n\nRequirement: 1. Inspect fuel pipe Part Number (P/N) 2-193-940-02 for chafing caused by the engine firewire responder unit(s) in accordance with BAe 146 SB.26-44 dated 25 February 1999.\n\nNote: This Service Bulletin has been classified as mandatory by the CAA(UK).\n\nCompliance: 1. Prior to 1 April 1999 and thereafter at each aircraft ‘C’ check, until BAe 146 SB.26-44-01638A is incorporated.\n\nThis Airworthiness Directive becomes effective on 17 March 1999.\n\nBackground: Operators have reported incidences of damage to the fuel feed pipe P/N 2-193-940-02 caused by movement of the firewire responder unit(s) leading to contact between the responder connector backshell clamp and the adjacent fuel pipe.\n\nThis Directive requires repetitive inspection of the area until optional terminating action is carried out.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical issue on specific aircraft. It has not expanded beyond its original purpose of mandating inspections for firewire responder unit interference with fuel pipes."},"complexity_factors":["Single, specific technical requirement (inspect one part number for one type of damage)","Only one conditional trigger (applicability based on whether modification HCM01638A/SB 26-44-01638A is installed)","Simple compliance timeline (one initial deadline + recurring at 'C' checks)","No defined terms section, no cross-references to other legislation beyond the parent regulations","Short document (approximately 200 words)","Single background issue with straightforward causal chain (movement → contact → damage)"],"plain_english_summary":"This Airworthiness Directive requires inspections of fuel pipe p/n 2-193-940-02 on BAe 146/Avro RJ aircraft because the firewire responder can chafe and damage the pipe. It applies to operators who have not fitted modification HCM01638A (Service Bulletin 26-44-01638A) and mandates inspection before 1 April 1999 and at every C‑check thereafter, using BAe Service Bulletin 26‑44 procedures, until the permanent fix is installed. The aim is to prevent fuel leaks near engines that could lead to fire."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive, as written, narrows to a specific safety concern: repetitive inspection of fuel pipe P/N 2-193-940-02 on listed BAe/Avro 146 aircraft lacking the identified modification. There is no textual expansion or narrowing beyond that original targeted inspection requirement (Applicability; Requirement; Compliance; Background)."},"complexity_factors":["Single, focused technical requirement (inspect one specified fuel pipe P/N 2-193-940-02) reduces legal ambiguity.","Applies to multiple aircraft series but only when a specific modification (HCM01638A / SB 26-44-01638A) is not incorporated, requiring record checks.","Mandates repetitive inspections (prior to 1 April 1999 and at each ‘C’ check) until optional terminating action — ongoing compliance burden for operators.","References an external manufacturer Service Bulletin (BAe SB.26-44 dated 25 Feb 1999) for inspection procedures, creating dependence on that technical document.","Includes an actionable deadline and an effective date (effective 17 March 1999), which creates short lead time for compliance.","Notes mandatory classification by CAA(UK) (Note), indicating cross-jurisdictional coordination but no additional procedural complexity in the text."],"plain_english_summary":"This Airworthiness Directive requires operators of BAe 146 and Avro 146‑RJ aeroplanes (all listed series without modification HCM01638A or SB 26‑44‑01638A) to inspect fuel feed pipe P/N 2‑193‑940‑02 for chafing caused by engine firewire responder units, following BAe SB.26‑44 (Requirement). Inspections must be done before 1 April 1999 and at each aircraft ‘C’ check until the optional terminating modification is incorporated; operators bear inspection and modification costs and must repeat inspections until the SB is fitted (Compliance; Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-74-powerplant-firewire-responder-units","history":"/api/acts/ad-bae-146-74-powerplant-firewire-responder-units/history","analysis":"/api/acts/ad-bae-146-74-powerplant-firewire-responder-units/analysis","conflicts":"/api/acts/ad-bae-146-74-powerplant-firewire-responder-units/conflicts","importantCases":"/api/acts/ad-bae-146-74-powerplant-firewire-responder-units/important-cases","documents":"/api/acts/ad-bae-146-74-powerplant-firewire-responder-units/documents"}}