{"id":"F2005L02822","name":"AD/B747/241 Amdt 1 - Flight Deck Dripshield Fire Blocking Installation","slug":"ad-b747-241-amdt-1-flight-deck-dripshield-fire-blocking-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":37753,"registerId":"commonwealth-F2005L02822-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 747 Series Aeroplanes","sectionType":"division","heading":"Boeing 747 Series Aeroplanes","content":"### Boeing 747 Series Aeroplanes\n\n| AD/B747/241 Amdt 1 | Flight Deck Dripshield FireBlocking Installation | 11/2005 |\n| ------------------ | ------------------------------------------------ | ------- |\n\n| Applicability: | Model 747 aircraft, line numbers 1 through 299 and 951 through 1234; except line numbers 292, 296, 297, 1174 and 1216.                                                                                                                                                |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2005-17-09 Amdt 39-14230.                                                                                                                                                                              |\n| Compliance:    | Before 22 March 2007.The compliance calendar time specified by FAA AD 2000-26-04 (original issue of this Directive) remains unchanged with the issue of superseding FAA AD2005-17-09.                                                                                 |\n|                | This Amendment becomes effective on 27 October 2005.                                                                                                                                                                                                                  |\n| Background:    | Investigations by the FAA indicated widespread use in drip shields of adhesive/material combinations that are easily ignited and able to propagate a small fire.Amendment 1 is issued in response to a new FAA AD, which removes certain aircraft from applicability. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n15 September 2005","sortOrder":0},{"sectionNumber":"AD/B747/241 Amdt 1","sectionType":"part","heading":"AD/B747/241 Amdt 1","content":"## AD/B747/241 Amdt 1","sortOrder":1},{"sectionNumber":"Flight Deck Dripshield FireBlocking Inst","sectionType":"part","heading":"Flight Deck Dripshield FireBlocking Installation","content":"## Flight Deck Dripshield Fire  \nBlocking Installation","sortOrder":2},{"sectionNumber":"11/2005","sectionType":"part","heading":"11/2005","content":"## 11/2005","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of the airworthiness directive. It is a minor technical amendment that simply removes two aircraft line numbers (1174 and 1216) from the applicability list based on updated FAA information. The core safety purpose — requiring fire-blocking installation in flight deck dripshields — remains unchanged."},"complexity_factors":["Very short document (under 300 words)","Only 4 defined elements: applicability range, compliance date, effective date, and reference to external FAA technical standard","No nested conditional logic or exceptions to exceptions","Single straightforward requirement: comply with external FAA directive","Simple amendment structure that only removes certain aircraft from applicability"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of specified Boeing 747 production-line aircraft to install fire‑blocking materials in flight‑deck dripshields because original adhesive/material combinations can ignite and spread fire. It implements FAA AD 2005‑17‑09, took effect 27 Oct 2005, and set a compliance deadline of 22 Mar 2007. The amendment narrows the affected fleet by excluding production lines 1174 and 1216."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment narrows the instrument's scope compared with the earlier issue by removing specific aircraft from applicability. The text states the amendment responds to the new FAA AD which removes certain aircraft from applicability; the instrument explicitly excludes line numbers 292, 296, 297, 1174 and 1216 from the originally listed ranges. The compliance timing (the calendar set by FAA AD 2000-26-04) is unchanged."},"complexity_factors":["Short, focused instrument (single safety requirement)","Cross-references to FAA AD 2005-17-09 for technical detail (work not reproduced in full)","Reference to and retention of compliance calendar from an earlier FAA AD (2000-26-04)","Applicability defined by ranges of line numbers with five specific exclusions","Clear fixed compliance date and effective date (no multi-stage or conditional deadlines)"],"plain_english_summary":"**What this instrument does (mechanically)**\n\n- It mandates a specific safety modification on certain Boeing 747 aeroplanes: the installation of fire-blocking material in the flight-deck dripshield (a panel/cover under and around the flight deck that can hide wiring, ducts and adhesives).\n- The work must be carried out in accordance with the technical requirements set out in FAA Airworthiness Directive (AD) 2005-17-09. The directive does not reproduce the technical steps; it requires operators to follow the FAA AD.\n- The instrument sets a compliance deadline (work to be completed before 22 March 2007) and states the amendment is effective 27 October 2005. It leaves the compliance calendar specified in the earlier FAA AD 2000-26-04 unchanged.\n\n**Who is affected**\n\n- Operators and owners of Boeing 747 series aeroplanes with line numbers 1 through 299 and 951 through 1234, except the specific line numbers 292, 296, 297, 1174 and 1216 which are excluded.\n- Maintenance organisations and certificated mechanics who will perform the installation and keep maintenance records.\n\n**Why it matters (stated purpose and technical background)**\n\n- The FAA investigated and found that some adhesive/material combinations used in dripshields are easily ignited and can allow a small fire to propagate. The AD’s stated purpose is to reduce the risk of flight-deck area fires by requiring non‑flammable or fire‑blocking materials to be installed in the dripshield.\n\n**Who pays, who decides, what changes**\n\n- Aircraft owners/operators pay: costs of parts, labour and aircraft downtime to carry out the retrofit.\n- The regulator (Civil Aviation Safety Authority delegate acting under this instrument) enforces the requirement and points operators to follow the FAA AD for technical detail.\n- Behaviour change required: operators must schedule and complete the retrofit on affected aeroplanes by the stated compliance deadline and update maintenance records to show compliance.\n\n**Implementation, costs and trade-offs**\n\n- Direct costs: procurement of approved fireblocking materials, specialist labour, and aircraft out-of-service time while the work is performed.\n- Operational impact: scheduling and potential short-term reduction in available aircraft capacity while complying aircraft are grounded for modification.\n- Technical risk and compliance burden: the AD incorporates FAA technical procedures; operators must ensure their maintenance organisations correctly follow those procedures and document compliance. Incorrect installation or paperwork could lead to regulatory action or grounding.\n- Market effects: increased demand for approved materials and certified maintenance work. Costs concentrate on the owners/operators of affected aircraft; benefits (reduced fire risk) accrue to passengers, crew and the public more diffusely.\n\n**Trade-offs and opportunity costs**\n\n- The instrument prioritises reduced fire risk (safety) over the short-term financial and scheduling costs borne by operators. The instrument imposes a one‑time retrofit cost and scheduling burden; operators must weigh that against other maintenance priorities and fleet usage.\n\n**Discretion and enforcement**\n\n- The AD delegates no novel discretionary choices to operators beyond following the FAA-mandated technical requirements and meeting the compliance date. CASA (through its delegate) enforces compliance and may rely on standard surveillance and certification mechanisms.\n\n**Notes on source and change**\n\n- This Amendment 1 mirrors a superseding FAA AD (2005-17-09) and narrows applicability by excluding specific line numbers compared to the earlier issue. The instrument explicitly retains the original compliance calendar set by FAA AD 2000-26-04.\n\n(Short legal note: an Airworthiness Directive is a mandatory safety instruction issued by aviation regulators requiring inspection, modification or repair to address an identified unsafe condition.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-241-amdt-1-flight-deck-dripshield-fire-blocking-installation","history":"/api/acts/ad-b747-241-amdt-1-flight-deck-dripshield-fire-blocking-installation/history","analysis":"/api/acts/ad-b747-241-amdt-1-flight-deck-dripshield-fire-blocking-installation/analysis","conflicts":"/api/acts/ad-b747-241-amdt-1-flight-deck-dripshield-fire-blocking-installation/conflicts","importantCases":"/api/acts/ad-b747-241-amdt-1-flight-deck-dripshield-fire-blocking-installation/important-cases","documents":"/api/acts/ad-b747-241-amdt-1-flight-deck-dripshield-fire-blocking-installation/documents"}}