{"id":"F2009L03339","name":"AD/B747/85 Amdt 5 - Corrosion Prevention and Control Program","slug":"ad-b747-85-amdt-5-corrosion-prevention-and-control-program","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":140894,"registerId":"commonwealth-F2009L03339-current","compilationNumber":null,"startDate":"2026-04-03","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/B747/85 Amdt 5 | Corrosion Prevention and Control Program | 11/2009 DM |\n| ----------------- | ---------------------------------------- | ---------- |\n\n| Applicability: | Model 747-100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, -400D, -400F, 747SR, and 747SP series aircraft.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 90-25-05 R1 Amdt39-15327.Corrosion classified as level 1 need not be reported.Level 2 corrosion may be consolidated with a sixty day report of corrective action, and submitted to the local CASA Field Office under cover of a single SDR.Level 3 corrosion shall be reported by SDR.Note 1: Boeing Document D6-36022 Rev D, or later FAA approved revision, is associated with FAA AD 90-25-05 R1.Note 2: Boeing Document D621U400-MRB, at Revision: Dec 2007,or later FAA approved revision, is an approved alternative means of compliance to FAA AD 90-25-05 R1 for Boeing Model 747-400 series aircraft only.Note 3: References made in the FAA AD text to the following; Administrator FAA, FAA Principal Inspector (PI), or Manager Seattle Aircraft Certification Office (ACO), shall be read as Civil Aviation Safety Authority Field Office. |\n| Compliance:    | As specified in the Requirement document.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |\n|                | This Amendment becomes effective on 2 September 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |\n| Background:    | The Country of Origin Airworthiness Authority requires implementation of a corrosion prevention and control program to prevent the degradation of the structural capabilities of the affected aircraft.Amendment 1 introduced a note which specified the reporting requirements when corrosion is found as a result of the CPCP.Amendment 2 introduced a method of compliance other than the Country of Origin AD to address current in-production aircraft.                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n\n|     | Amendment 3 clarified the alternative means of compliance for Model 747-400 aircraft.Amendment 4 clarified the applicability of the existing AD by specifying which Model 747 aircraft are affected, because certain new variants that have not yet been certified would have been subject to the requirements of this Directive.Amendment 5 is issued to allow use of later revisions of Boeing Document D621U400-MRB as an AMOC to FAA AD 90-25-05 R1. |\n| --- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n26 August 2009","sortOrder":0},{"sectionNumber":"AD/B747/85 Amdt 5","sectionType":"part","heading":"AD/B747/85 Amdt 5","content":"## AD/B747/85 Amdt 5","sortOrder":1},{"sectionNumber":"Corrosion Prevention and Control Program","sectionType":"part","heading":"Corrosion Prevention and Control Program","content":"## Corrosion Prevention and Control Program","sortOrder":2},{"sectionNumber":"11/2009 DM","sectionType":"part","heading":"11/2009 DM","content":"## 11/2009 DM","sortOrder":3}],"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"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"The original directive required compliance with a single US FAA airworthiness directive. Over 5 amendments, the scope has expanded to: (1) add detailed corrosion reporting requirements not in the original, (2) create model-specific alternative compliance paths for 747-400 aircraft, (3) explicitly exclude future uncertified variants from applicability, and (4) incorporate a broader range of approved Boeing maintenance documents as alternatives to the original FAA directive. The directive has evolved from simple 'follow the US rule' to a more complex, multi-path compliance framework with Australian-specific reporting requirements."},"complexity_factors":["Multiple nested document references: requires cross-referencing to FAA AD 90-25-05 R1, Boeing Document D6-36022 Rev D, and Boeing Document D621U400-MRB","Conditional reporting logic with three severity levels (Level 1, 2, 3) each with different reporting timeframes and methods","Model-specific alternative compliance paths: 747-400 series has different approved documents than other 747 models","Substitution clause requiring Australian operators to read US regulatory references (FAA Administrator, Principal Inspector, Seattle ACO) as Australian CASA Field Office","Amendment history tracking (5 amendments) with cumulative changes to applicability, reporting, and alternative means of compliance"],"plain_english_summary":"This AD mandates a Corrosion Prevention and Control Program (CPCP) for specified Boeing 747 series (‑100/200/300/400, 747SR, 747SP) operated in Australia, requiring systematic inspections, repairs and reporting of corrosion findings (minor no report; moderate within 60 days; severe immediately via a Service Difficulty Report). Amendment 5 permits using updated Boeing maintenance documents (notably a newer manual for 747‑400s) as acceptable alternatives, easing compliance while keeping ageing 747 structures safe."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"Yes. Amendment 5 expands acceptable alternative means of compliance by allowing use of later revisions of Boeing Document D621U400-MRB for Model 747-400 series aircraft (see Amendment 5 and Note 2). Previously the AMOC was limited to the December 2007 revision; this amendment accepts later FAA‑approved revisions, altering which document versions operators may rely on for compliance."},"complexity_factors":["Cross-reference to an external FAA AD (FAA AD 90-25-05 R1) rather than containing standalone technical requirements (Requirement).","Multiple Boeing documents referenced as compliance standards or alternative means (D6-36022 Rev D and D621U400-MRB) with specified revision constraints (Note 1, Note 2).","Differentiated reporting thresholds and timelines for corrosion levels (Level 1 no report; Level 2 may be consolidated with a 60‑day corrective action report; Level 3 requires an SDR) which create conditional administrative steps (Requirement).","Geographical/administrative re-mapping of FAA roles to CASA Field Office introduces a change in decision authority and reporting destination (Note 3).","Applicability spans many model variants with specific carve-outs (Applicability; Background; Amendment 4 reference), increasing per-operator applicability checks.","Amendment history and allowance for later revisions as AMOC (Amendment 5) introduce ongoing document-version management and potential need to confirm FAA/CASA approvals.","Reporting consolidation option (single SDR covering multiple Level 2 findings) creates procedural choices and potential aggregation risk for operators (Requirement).","Compliance timing and effective date requirements (Compliance; effective 2 September 2009) impose calendar-driven obligations for operators and maintainers."],"plain_english_summary":"This amendment requires operators of listed Boeing 747 variants to carry out a Corrosion Prevention and Control Program in line with FAA AD 90-25-05 R1 and to report more serious corrosion findings to the Civil Aviation Safety Authority (CASA). It permits use of specified Boeing maintenance documents (and, for 747‑400s, later approved revisions of D621U400‑MRB) as alternative means of compliance, affecting operational maintenance, reporting obligations and documentation choices for aircraft owners and maintainers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-85-amdt-5-corrosion-prevention-and-control-program","history":"/api/acts/ad-b747-85-amdt-5-corrosion-prevention-and-control-program/history","analysis":"/api/acts/ad-b747-85-amdt-5-corrosion-prevention-and-control-program/analysis","conflicts":"/api/acts/ad-b747-85-amdt-5-corrosion-prevention-and-control-program/conflicts","importantCases":"/api/acts/ad-b747-85-amdt-5-corrosion-prevention-and-control-program/important-cases","documents":"/api/acts/ad-b747-85-amdt-5-corrosion-prevention-and-control-program/documents"}}