{"id":"F2006B03247","name":"AD/B747/68 Amdt 1 - Engine Overheat, Fire Detection and Fire Extinguishing Systems","slug":"ad-b747-68-amdt-1-engine-overheat-fire-detection-and-fire-extinguishing-systems","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42671,"registerId":"commonwealth-F2006B03247-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/68 Amdt 1 - Engine Overheat, Fire Detection and Fire Extinguishing Systems","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/B747/68\n\nAmdt 1\n\n  \n\nEngine Overheat, Fire Detection and Fire Extinguishing Systems\n\n  \n11/89\n\nApplicability: All Boeing 747 series aircraft line numbers 489, 494 through 496, 500 through 695,\n\n697 through 699, 701 through 704, 706, 707, 709 through 714, 716, 718 through 720,\n\nand 724.\n\nRequirement: 1. Engine Fire/Overheat Detection and Warning Systems Carry out a functional check of each system in accordance with Boeing Telex M-7201-89-0194 dated 31 January 1989.\n\n    2. Engine Fire Extinguishing System Wiring and Plumbing Carry out a functional check of the wiring and plumbing in accordance with Boeing Telex M-7201-89- 0200 dated 31 January 1989 as corrected by Boeing Telex M-7201-89-0284 dated 14 February 1989 for Pratt and Whitney engines; as corrected by Boeing Telex M- 7201-89-0285 dated 14 February 1989 for GE CF6-45/50 engines; and as corrected by Boeing Telex M-7201-89-0290 dated 15 February 1989 for GE CF6-80C2 engines.\n\nNote: The plumbing functional check applies only to aircraft fitted with General Electric CF6 engines.\n\n    3. Cargo Compartment Fire Detection System\n\nCarry out a functional check in accordance with Boeing Telex M \\-7201-89-0197 dated 31 January 1989 as corrected by Boeing Telex M-7201-89-0304 dated\n\n17 February 1989.\n\n    4. Cargo Compartment Fire Extinguishing System\n\nCarry out a functional check of the wiring in accordance with Boeing Telex M- 7201-89-0195, and the plumbing in accordance with Boeing Telex M-7201-89- 0195, dated 31 January 1989.\n\nCompliance: Unless previously accomplished, within 25 days from 2 November 1989, and thereafter before next flight following any maintenance action involving Engine Overheat, Fire Detection and/or Fire Extinguishing Systems which could possibly result in cross-connection or mis-connection of any system wiring or plumbing.\n\nBackground: There have been reports in the last several months of improperly installed wiring and/or plumbing in the engine and cargo compartment Fire Protection System on various model Boeing aircraft. Whilst the cause of these problems has not been identified in each case, the FAA has determined that, due to design similarity or common production lines, these conditions are likely to exist on other Fire Protection Systems of other Boeing aircraft not covered by previous AD action, and that as a precautionary measure, checks must be performed on specified aircraft.\n\nAmendment 1 to this AD is issued to reflect a revision to the requirement documentation references.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Amendment 1 only revises the document references for the required procedures (updates to Boeing Telex numbers/corrections). It does not expand the set of required checks, the applicability list, or the compliance timing; therefore the scope and purpose remain aligned with the original AD."},"complexity_factors":["Short, focused directive with four discrete functional checks (Requirements 1–4)","Multiple external document references (five Boeing Telex documents plus several dated corrections)","Applicability limited to a list of specific Boeing 747 line numbers (detailed list in Applicability)","Conditional requirement: plumbing functional check applies only to aircraft with GE CF6 engines (Note under Requirement 2)","Two-tier timing: one initial 25‑day deadline and an ongoing condition requiring checks before next flight after relevant maintenance","Amendment updates only the reference documents rather than changing substantive obligations"],"plain_english_summary":"**What this directive does (mechanical change)\n\n- This is an Airworthiness Directive (AD) that orders specific functional checks of the engine and cargo fire detection and fire-extinguishing systems on certain Boeing 747 aircraft (listed by line number).\n- The AD requires four checks:  \n  - Engine fire/overheat detection and warning systems (Requirement 1 — follow Boeing Telex M-7201-89-0194).  \n  - Engine fire extinguishing system wiring and plumbing (Requirement 2 — follow Boeing Telex M-7201-89-0200 and the listed corrections for specific engine types).  \n  - Cargo compartment fire detection system (Requirement 3 — follow Boeing Telex M-7201-89-0197 and its correction).  \n  - Cargo compartment fire extinguishing system wiring and plumbing (Requirement 4 — follow Boeing Telex M-7201-89-0195).\n- Timing: If not already done, operators must complete these checks within 25 days from 2 November 1989. After that, the wiring/plumbing checks must also be completed before the next flight following any maintenance that could cause cross‑connection or mis‑connection of the systems.\n- A specific note: the plumbing functional check in Requirement 2 applies only to aircraft fitted with General Electric CF6 engines.\n\n**Who this affects\n\n- Aircraft operators and owners of the listed Boeing 747 line numbers.  \n- Maintenance organisations and licensed mechanics who perform the required functional checks and any corrective work.  \n- Potentially suppliers of parts or repair services if defects or mis‑connections are found and require replacement or rework.\n\n**Why it matters (official rationale and testing that claim)\n\n- The stated background (the regulator cites FAA reports) says there were recent incidents of improperly installed wiring and/or plumbing in engine and cargo fire protection systems on Boeing models. The FAA judged that, because of design similarity or common production lines, the same faults could exist on other Boeing aircraft and so checks are necessary.\n\nTesting that rationale against practical effects and implementation issues\n\n- Who pays: Operators bear the direct costs — labour hours to carry out the functional checks, any aircraft downtime, and any repair parts and labour if mis‑connections are found (see Requirements 1–4).\n- When and how often: The immediate one‑off deadline (25 days) forces near‑term workload; thereafter the requirement to check before the next flight after any maintenance involving these systems creates an ongoing procedural obligation for maintenance events that could affect wiring/plumbing (Compliance paragraph).\n- Implementation burden: Compliance depends on access to and following Boeing Telex instructions named in each requirement. That creates a dependence on manufacturer service documents (see the specific telex references in Requirements 1–4). The AD does not itself describe detailed test procedures; it mandates the telex procedures.\n- Scope and targeting: The AD is targeted — it applies only to specific Boeing 747 line numbers and to certain engine types where plumbing checks are relevant (see Applicability list and the Note under Requirement 2). That concentrates costs on a defined subset of operators while benefitting anyone flying on those aircraft.\n- Operational trade‑offs: Operators can reduce incremental disruption by scheduling these checks to coincide with existing maintenance where possible. However, the 25‑day initial deadline may force out‑of‑sequence checks or short‑term schedule changes.\n- Bureaucratic discretion and reliance on external data: CASA relies on FAA findings and Boeing telexes for both the safety premise and the remedial procedures. The regulator's action is procedural (mandating checks) rather than prescriptive about design changes; corrective work follows from findings during checks.\n- Effects on competition and markets: The AD imposes compliance costs on affected operators but does not change market rules or ownership. Maintenance providers may see increased demand for the required checks and any corrective work; smaller operators may face proportionally larger cost impacts if they have fewer maintenance resources.\n- Risk of substitution or avoidance: There is limited scope to avoid the requirement — operators must perform the checks before next flight after relevant maintenance or within the initial 25‑day window. Operators can, however, minimise impact by integrating checks into planned maintenance.\n\n**Document change note**\n\n- The AD text states that Amendment 1 merely updates the referenced Boeing telex documentation (\"Amendment 1 to this AD is issued to reflect a revision to the requirement documentation references\"). The operational requirements themselves (checks and timing) remain those set out in Requirements 1–4 and the Compliance paragraph."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is an amendment to an existing Airworthiness Directive. The original 1989 directive required safety checks on fire protection systems. Amendment 1 makes no substantive change to the scope — it merely updates document reference numbers (the Boeing Telex numbers) to reflect corrected technical documentation. The applicability, requirements, and compliance timing remain identical to the original intent."},"complexity_factors":["Multiple specific aircraft line numbers listed (24 separate ranges/individual numbers)","Three different engine types requiring different technical document references (Pratt & Whitney, GE CF6-45/50, GE CF6-80C2)","Conditional applicability: plumbing check only applies to GE CF6 engines","Cross-references to four separate Boeing Telex documents, three of which have correction notices","Dual compliance trigger: initial deadline (25 days) plus ongoing requirement after certain maintenance","Technical aviation terminology requiring domain knowledge (line numbers, telex references, functional checks)"],"plain_english_summary":"This CASA Airworthiness Directive mandates functional checks of fire detection and extinguishing systems on specified Boeing 747s (production line numbers from about the late 1970s to mid‑1980s), with plumbing checks limited to CF6‑engined aircraft. It responds to reports of incorrect wiring/plumbing that could prevent warnings or suppression from working. Compliance was required within 25 days of 2 Nov 1989 and after any maintenance affecting these systems. Amendment 1 corrects technical document reference numbers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-68-amdt-1-engine-overheat-fire-detection-and-fire-extinguishing-systems","history":"/api/acts/ad-b747-68-amdt-1-engine-overheat-fire-detection-and-fire-extinguishing-systems/history","analysis":"/api/acts/ad-b747-68-amdt-1-engine-overheat-fire-detection-and-fire-extinguishing-systems/analysis","conflicts":"/api/acts/ad-b747-68-amdt-1-engine-overheat-fire-detection-and-fire-extinguishing-systems/conflicts","importantCases":"/api/acts/ad-b747-68-amdt-1-engine-overheat-fire-detection-and-fire-extinguishing-systems/important-cases","documents":"/api/acts/ad-b747-68-amdt-1-engine-overheat-fire-detection-and-fire-extinguishing-systems/documents"}}