{"id":"F2006B03118","name":"AD/B747/218 - Crew Rest Area Heat Exchanger","slug":"ad-b747-218-crew-rest-area-heat-exchanger","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42490,"registerId":"commonwealth-F2006B03118-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/218 - Crew Rest Area Heat Exchanger","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)  \nBoeing 747 Series Aeroplanes\n\nAD/B747/218 Crew Rest Area Heat Exchanger 1/2000\n\nApplicability: Model 747-400 series aircraft; as listed in Boeing Alert Service Bulletin 747- 53A2430.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 99-22-09 Amdt 39- 11387.\n\nCompliance: As specified in the Requirement document with a revised effective date of 31 December 1999.\n\nThis Airworthiness Directive becomes effective on 31 December 1999.\n\nBackground: The FAA received a report of interference between insulation blankets adjacent to the heat exchangers and flight control cables. The actions required by this Directive are intended to prevent a reduction in maximum rudder and elevator surface deflection due to the separation of heat exchangers from the body frame, which could result in reduced control of the aircraft.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive maintains the original safety-focused scope described in the Background: it requires operators of specified 747-400 series aeroplanes to carry out the actions in FAA AD 99-22-09 and the Boeing service bulletin to address interference between insulation blankets and flight control cables and to prevent potential separation of heat exchangers that could reduce control effectiveness (Applicability; Requirement; Background). The AD does not expand or narrow that technical scope in its text; it adopts the FAA technical requirements and sets an Australian effective date (Requirement; Compliance)."},"complexity_factors":["Cross-reference to external technical documents (FAA AD 99-22-09 and Boeing Alert Service Bulletin 747-53A2430) for procedural detail","Aircraft-specific applicability requiring identification of affected serial numbers/airframes (Applicability)","Technical tasks involve inspection, potential modification or repair of heat exchangers and nearby insulation/flight-control cable routing (Background; Requirement)","Regulatory timing requirement with a fixed effective date that operators must meet (Compliance)","Operational disruption and coordination with maintenance resources (implicit in Requirement and Compliance)"],"plain_english_summary":"This AD makes compliance mandatory for certain Boeing 747-400 aircraft to carry out the inspection and corrective actions specified in FAA AD 99-22-09 and Boeing Alert Service Bulletin 747-53A2430, effective 31 December 1999. It affects operators and maintenance organisations for those aeroplanes, addressing insulation/heat‑exchanger interference with flight‑control cables to prevent possible loss of rudder and elevator deflection; operators bear the inspection/repair costs."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete airworthiness directive with a single, specific safety purpose. It has not expanded beyond its original intent."},"complexity_factors":["Very short document (under 200 words)","Only 4 operative paragraphs (Applicability, Requirement, Compliance, Background)","No defined terms section","Single cross-reference to external FAA document (AD 99-22-09)","Single cross-reference to Boeing Service Bulletin","No conditional logic or nested exceptions","Clear, direct imperative language ('Action in accordance with...')","Specific, narrow applicability (one aircraft model series)"],"plain_english_summary":"This is a **safety order for specific Boeing 747 aircraft**.\n\n**What it does:**\nTells airlines operating certain Boeing 747-400 planes to inspect and fix a problem with heat exchangers (cooling equipment) in the crew rest area. The issue is that insulation blankets near these heat exchangers can interfere with flight control cables. If the heat exchangers break loose from the frame, they could stop the rudder and elevator (the moving parts that steer and tilt the plane) from moving fully, making the aircraft harder to control.\n\n**Who it affects:**\n- Airlines and operators of Boeing 747-400 series aircraft\n- Specifically those planes covered by Boeing Alert Service Bulletin 747-53A2430\n\n**Why it matters:**\nThis prevents a potential safety hazard where pilots might not have full control of the aircraft during flight. The directive requires operators to follow technical instructions from the US Federal Aviation Administration (FAA AD 99-22-09) to fix the problem by 31 December 1999."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-218-crew-rest-area-heat-exchanger","history":"/api/acts/ad-b747-218-crew-rest-area-heat-exchanger/history","analysis":"/api/acts/ad-b747-218-crew-rest-area-heat-exchanger/analysis","conflicts":"/api/acts/ad-b747-218-crew-rest-area-heat-exchanger/conflicts","importantCases":"/api/acts/ad-b747-218-crew-rest-area-heat-exchanger/important-cases","documents":"/api/acts/ad-b747-218-crew-rest-area-heat-exchanger/documents"}}