{"id":"F2009L04363","name":"AD/SF340/12 Amdt 1 - Air Conditioning System Couplings","slug":"ad-sf340-12-amdt-1-air-conditioning-system-couplings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":82112,"registerId":"commonwealth-F2009L04363-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"SAAB SF340 Series Aeroplanes","sectionType":"division","heading":"SAAB SF340 Series Aeroplanes","content":"### SAAB SF340 Series Aeroplanes\n\n| AD/SF340/12 Amdt 1 | Air Conditioning System Couplings | 24/2009 |\n| ------------------ | --------------------------------- | ------- |\n\n| Applicability: | Model SF 340A with serial numbers 340A-003 to -138 inclusive.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with SAAB Service Bulletin (SB) No. SF340-21-22, and as appropriate SB SF340-53-025.Note: Swedish AD No. 1-029 refers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |\n| Compliance:    | At the next “B” Check after the effective date of this AD, unless already accomplished.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |\n|                | This Amendment becomes effective 28 January 2010.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |\n| Background:    | Bleed air leakage in the ACM compartment caused by “Gamah” type coupling separation has resulted in structural damage due to overheated panels with resultant bonding separation between stringers and skin panel.This amendment mandates SB340-53-025 as contained in Swedish AD No. 1-029. Also, Compliance 2. (b) of the previous issue of this AD has been removed as it was an Australian unique requirement not contained in the Requirement documents or the Swedish AD. Therefore, SB SF340-53-025 has been inserted into this amendment and the required actions of the previous AD revised into a single requirement and a single compliance requirement. |\n\n![](image.001.png)\n\nWilliam David  \nDelegate of the Civil Aviation Safety Authority\n\n25 November 2009","sortOrder":0},{"sectionNumber":"AD/SF340/12 Amdt 1","sectionType":"part","heading":"AD/SF340/12 Amdt 1","content":"## AD/SF340/12 Amdt 1","sortOrder":1},{"sectionNumber":"Air Conditioning System Couplings","sectionType":"part","heading":"Air Conditioning System Couplings","content":"## Air Conditioning System Couplings","sortOrder":2},{"sectionNumber":"24/2009","sectionType":"part","heading":"24/2009","content":"## 24/2009","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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment removed a prior Australian-unique compliance item (Compliance 2(b)) and inserted Saab SB SF340-53-025, consolidating previous actions into a single requirement and single compliance timing. That narrows regulatory divergence by aligning this AD with Swedish AD No. 1-029 while keeping the same fleet applicability and the obligation on operators to carry out the SB work at the next “B” Check."},"complexity_factors":["References external manufacturer documents (SB SF340-21-22 and SF340-53-025) — compliance requires access to and reliance on those SBs.","Applicability limited to a defined serial‑number range (340A-003 to -138) — requires accurate fleet identification.","Single compliance timing tied to the next “B” Check — integrates with operators’ maintenance scheduling but may defer immediate action.","Technical remedy involves air‑conditioning/bleed‑air couplings (risk of structural damage) — requires mechanical intervention and specialist labour.","Regulatory alignment: amendment removes an Australian‑unique clause and adopts Swedish AD actions (Swedish AD No. 1-029) — reduces divergence but shifts conformity obligations.","Enforcement and effectivity are set by CASA (Delegate signature/date) — administrative discretion limited to issuing the AD."],"plain_english_summary":"This directive requires operators of SAAB SF340A aeroplanes (serials 340A-003 to -138) to carry out the actions in Saab Service Bulletins SF340-21-22 and SF340-53-025 at the next “B” check to inspect and modify air‑conditioning couplings that can leak bleed air. Bleed‑air leakage from “Gamah” coupling separation caused overheating and structural damage; aircraft operators pay for and schedule the work, and CASA’s amendment removes a previous Australian‑unique requirement to align with Swedish AD No. 1-029."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"The original AD appears to have included an Australian-unique requirement (Compliance 2.(b)) that went beyond the manufacturer's service bulletin and the Swedish aviation authority's directive. This amendment narrows the scope by removing that unique requirement and instead adopting the Swedish approach. The scope has shifted from 'Australian-specific additional requirement' to 'harmonised international standard' — a deliberate reduction in unique Australian content in favour of alignment with foreign aviation safety standards."},"complexity_factors":["Very short document (approximately 250 words of substantive content)","Only 2 defined technical references (the Service Bulletins)","Single applicability criterion (specific serial number range)","Single compliance trigger (next 'B' Check)","No nested exceptions or conditional logic — straightforward mandate","Cross-references only to external technical documents (SAAB SBs and Swedish AD), not to other legislation"],"plain_english_summary":"This AD mandates owners/operators of SAAB SF340A aircraft (S/N 340A‑003 to 340A‑138) to inspect and remediate a hazardous air‑conditioning/bleed‑air leak from \"Gamah\" couplings that can overheat and damage structure. Compliance requires following SAAB SB SF340‑21‑22 and SB SF340‑53‑025 at the next scheduled B‑check after 28 Jan 2010 (unless already done). Amendment 1 removes an Australia‑only condition to align the requirement with Sweden’s safety directive."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sf340-12-amdt-1-air-conditioning-system-couplings","history":"/api/acts/ad-sf340-12-amdt-1-air-conditioning-system-couplings/history","analysis":"/api/acts/ad-sf340-12-amdt-1-air-conditioning-system-couplings/analysis","conflicts":"/api/acts/ad-sf340-12-amdt-1-air-conditioning-system-couplings/conflicts","importantCases":"/api/acts/ad-sf340-12-amdt-1-air-conditioning-system-couplings/important-cases","documents":"/api/acts/ad-sf340-12-amdt-1-air-conditioning-system-couplings/documents"}}