{"id":"F2017L01417","name":"AD/DHC-8/138 Amdt 1 - Fuel System Safety","slug":"ad-dhc-8-138-amdt-1-fuel-system-safety","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":144232,"registerId":"commonwealth-F2017L01417-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bombardier DHC-8 Series Aeroplanes","sectionType":"part","heading":"Bombardier DHC-8 Series Aeroplanes","content":"# Bombardier DHC-8 Series Aeroplanes\n\n| AD/DHC-8/138 Amdt 1 | Fuel System Safety | 22/2017 |\n| ------------------- | ------------------ | ------- |\n\n| Applicability: | Bombardier DHC-8-400, DHC-8-401 and DHC-8-402 model aeroplanes.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | To ensure management and control of Critical Design Configuration Control Limitations (CDCCL) items, each registered operator of the aeroplane must:a. Amend their copies of the DHC-8-400 Maintenance Requirements Manual, PSM 1‑84‑7 Part 2 “Airworthiness Limitations Items”, as in force at the time of issue of AD/DHC-8/138, to incorporate the CDCCL items introduced in Temporary Revisions (TR) ALI-55 and ALI-56, as in force at the time of issue of AD/DHC‑8/138. This may be accomplished by inserting copies of the TR in the manual.b. Amend any of their DHC-8-400 Series aircraft related procedures and documentation to highlight the existence of CDCCL items noted above and to highlight the necessary requirements to maintain the design features of those CDCCL items.Note 1: Maintenance Requirements Manual TRs introduced by this Directive may be removed from the manual when the TR is cancelled or superseded by either a further TR or later normal revision to the manual.Note 2: Transport Canada AD CF-2008-06 refers. |\n| Compliance:    | Within 30 days after the commencement date of this Directive, unless previously accomplished.Note 3: Previous compliance with the requirements in AD/DHC-8/138 constitutes compliance with the equivalent requirements in this AD.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |\n|                | This AD commences on 3 November 2017.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n| Background:    | Bombardier Aerospace has completed a system safety review of the aircraft fuel system against fuel tank safety standards introduced in Chapter 525 of the Airworthiness Manual through Notice of Proposed Amendment (NPA) 2002-043. The identified non-compliances were then assessed using Transport Canada Policy Letter No. 525-001, to determine if mandatory corrective action is required.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n\n|     | Amendment 1 of the AD is issued to correct a temporary revision number referenced in the Requirement section of this AD. |\n| --- | ------------------------------------------------------------------------------------------------------------------------ |\n\n![](image.001.jpeg)\n\nPieter van Dijk  \nDelegate of the Civil Aviation Safety Authority\n\n31 October 2017","sortOrder":0},{"sectionNumber":"AD/DHC-8/138 Amdt 1","sectionType":"part","heading":"AD/DHC-8/138 Amdt 1","content":"## AD/DHC-8/138 Amdt 1","sortOrder":1},{"sectionNumber":"Fuel System Safety","sectionType":"part","heading":"Fuel System Safety","content":"## Fuel System Safety","sortOrder":2},{"sectionNumber":"22/2017","sectionType":"part","heading":"22/2017","content":"## 22/2017","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Amendment 1 corrects a temporary revision number referenced in the Requirement section; it does not introduce new substantive obligations or broaden the AD’s applicability. The directive still mandates inserting TRs ALI‑55 and ALI‑56 and updating operator procedures within 30 days (Requirement; Compliance)."},"complexity_factors":["Narrow technical scope — administrative amendment of maintenance manuals and procedures (Requirement).","Use of specialist term CDCCL which requires operators to recognise and protect design‑critical features (Requirement).","Cross‑jurisdictional reference to Transport Canada AD CF‑2008‑06 and Bombardier TRs ALI‑55/ALI‑56 (Background; Requirement).","Short compliance timeframe of 30 days increases administrative pressure on operators (Compliance).","Amendment issued to correct a referenced temporary revision number, creating potential for confusion in implementation (Amendment note)."],"plain_english_summary":"This AD requires operators of Bombardier DHC‑8‑400/401/402 aeroplanes to insert Temporary Revisions ALI‑55 and ALI‑56 into their Maintenance Requirements Manual and to update company procedures so Critical Design Configuration Control Limitations (CDCCLs) are recorded and preserved. It must be done within 30 days of commencement (3 November 2017). (Requirement; Compliance) Operators bear the cost and administrative burden of the manual and procedure changes; CASA enforces the AD; the action follows Bombardier’s fuel‑system safety review and a Transport Canada assessment."},"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":3,"scope_assessment":{"changed":false,"description":"This is a minor administrative amendment (Amendment 1) that corrects a temporary revision number in the original AD/DHC-8/138. The scope remains exactly as originally intended — ensuring fuel system CDCCL compliance for DHC-8-400 operators. The amendment does not expand applicability, add new requirements, or alter the substantive safety intent."},"complexity_factors":["Heavy reliance on external documents: operators must cross-reference Temporary Revisions ALI-55 and ALI-56, the DHC-8-400 Maintenance Requirements Manual (PSM 1-84-7), Transport Canada AD CF-2008-06, and Chapter 525 of the Airworthiness Manual","Nested defined terms: 'CDCCL' (Critical Design Configuration Control Limitations) is used throughout without on-the-spot definition, requiring aviation maintenance knowledge","Conditional compliance pathway: Note 3 creates an exception where previous compliance with the original AD satisfies this amended version","Temporal ambiguity in references: 'as in force at the time of issue of AD/DHC-8/138' appears twice, creating potential confusion about which version of documents applies","Administrative rather than operational complexity: the substance is straightforward (update manuals) but the document references are bureaucratically dense"],"plain_english_summary":"This AD mandates that Australian operators of Bombardier DHC‑8‑400 series (Q400) aircraft update maintenance manuals and procedures to include Critical Design Configuration Control Limitations (CDCCLs) for the fuel system to prevent explosions/fires. Operators must insert two temporary revisions within 30 days and flag CDCCL items for special handling. The amendment corrects a paperwork error in the original 2017 directive; operators already compliant remain compliant."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-8-138-amdt-1-fuel-system-safety","history":"/api/acts/ad-dhc-8-138-amdt-1-fuel-system-safety/history","analysis":"/api/acts/ad-dhc-8-138-amdt-1-fuel-system-safety/analysis","conflicts":"/api/acts/ad-dhc-8-138-amdt-1-fuel-system-safety/conflicts","importantCases":"/api/acts/ad-dhc-8-138-amdt-1-fuel-system-safety/important-cases","documents":"/api/acts/ad-dhc-8-138-amdt-1-fuel-system-safety/documents"}}