{"id":"F2006L01320","name":"AD/F50/94 - Engine Mount Tubing and End Fittings","slug":"ad-f50-94-engine-mount-tubing-and-end-fittings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":58811,"registerId":"commonwealth-F2006L01320-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Fokker F50 (F27 Mk 50) Series Aeroplanes","sectionType":"division","heading":"Fokker F50 (F27 Mk 50) Series Aeroplanes","content":"### Fokker F50 (F27 Mk 50) Series Aeroplanes\n\n| AD/F50/94 | Engine Mount Tubing and End Fittings | 6/2006 |\n| --------- | ------------------------------------ | ------ |\n\n| Applicability: | Model F27 Mk 050, Mk 0502, and Mk 0604 aircraft, all serial numbers, unless the engine mount frames have been inspected previously in accordance with the Fokker 50/60 MRB Document, Task Numbers 712000-00-09 and 712000-00-10.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Perform an X-ray inspection on the engine mount tubing and end fittings in accordance with Section 3. Accomplishment Instructions of Fokker Service Bulletin SBF50-71-047, dated 15 February 2006, or later EASA approved revision.2. Following accomplishment of the Requirement 1 inspection, report all inspection results to Fokker Services in accordance with the procedure described in SBF50-71-047.3. No spare engine mount may be installed on any aircraft as a replacement part, unless it has been X-ray inspected in accordance with Section 3. Accomplishment Instructions of Fokker Component Service Bulletin F8200-035-71-12, dated 15 February 2006, or later EASA approved revision.Note: CAA-NL AD NL-2006-005 refers. |\n| Compliance:    | 1. Within 2 years after 8 June 2006.2. Within 7 days of accomplishment of Requirement 1 inspection.3. After 15 June 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n|                | This Airworthiness Directive becomes effective on 8 June 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n\n| Background: | During scheduled MRB mid-life X-ray inspections of Fokker 50 engine mount frames, severe internal corrosion of the tubes was discovered. In some locations, the depth of the corrosion spots appeared to be more than 50 percent of material thickness. Premature degradation of the synthetic preservation oil film that protects the interior of the tubes and end fittings of the engine mount frames is considered to be the cause of the corrosion. This condition, if not corrected, could ultimately lead to failure of the engine mounting frame in cases where multiple tubes are severely affected. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nRichard Castles  \nDelegate of the Civil Aviation Safety Authority\n\n18 April 2006","sortOrder":0},{"sectionNumber":"AD/F50/94","sectionType":"part","heading":"AD/F50/94","content":"## AD/F50/94","sortOrder":1},{"sectionNumber":"Engine Mount Tubing and End Fittings","sectionType":"part","heading":"Engine Mount Tubing and End Fittings","content":"## Engine Mount Tubing and End Fittings","sortOrder":2},{"sectionNumber":"6/2006","sectionType":"part","heading":"6/2006","content":"## 6/2006","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":4,"scope_assessment":{"changed":false,"description":"The directive’s scope matches its stated purpose: it targets engine‑mount tubing and end fittings on specified Fokker F50 models (all serial numbers except those already inspected per the MRB tasks) and requires X‑ray inspection, reporting, and inspection of spare mounts. There is no expansion beyond those aircraft, parts and inspection actions described in the instrument."},"complexity_factors":["Technical non‑destructive testing requirement (X‑ray) and interpretation of results","Cross‑references to multiple service documents (Fokker Service Bulletin SBF50‑71‑047 and Component Service Bulletin F8200‑035‑71‑12) and any later EASA‑approved revisions","Conditional applicability (exempts aircraft if prior MRB inspections per specific task numbers were done)","Mandatory reporting obligation to manufacturer (timing and procedure requirements)","Compliance deadlines for initial inspection, reporting, and parts fitting","Restriction on installation of spare engine mounts unless inspected","Regulatory enforcement by the Civil Aviation Safety Authority delegate and reference to another AD (CAA‑NL AD NL‑2006‑005)"],"plain_english_summary":"This directive requires operators of Fokker F50 (F27 Mk 050, 0502 and 0604) aircraft to X‑ray the engine‑mount tubing and end fittings to find internal corrosion, to report all results to Fokker Services, and to ensure any replacement engine mounts are X‑ray inspected before fitting. It is designed to prevent possible engine‑mount frame failure caused by internal corrosion. Operators pay inspection and reporting costs, the regulator enforces compliance within set deadlines, and the rule restricts use of uncertified spare mounts."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with a focused, single-purpose scope: addressing a specific safety-critical corrosion issue in Fokker 50 engine mounts. The scope remains tightly constrained to the identified safety risk without expansion into broader regulatory areas."},"complexity_factors":["Single, specific technical requirement (X-ray inspection) with clear reference to external technical document (Fokker Service Bulletin SBF50-71-047)","Three distinct compliance deadlines with straightforward timing (2 years, 7 days, and a fixed date)","Single exemption clause (aircraft already inspected per specific MRB Document task numbers)","Minimal defined terms — relies on external aviation technical standards rather than legislative definitions","No nested exceptions or conditional logic beyond the initial applicability exemption"],"plain_english_summary":"This CASA Airworthiness Directive requires X‑ray inspection of engine‑mount tubing and end fittings on certain Fokker 50 series aircraft after severe internal corrosion was found. Operators must report results to Fokker Services within 7 days and may not install spare mounts unless X‑ray inspected. It targets affected Fokker 50 operators to prevent possible engine‑mount failure (and potential engine separation). Compliance deadlines run from immediate reporting to inspections within two years; AD effective 8 June 2006."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f50-94-engine-mount-tubing-and-end-fittings","history":"/api/acts/ad-f50-94-engine-mount-tubing-and-end-fittings/history","analysis":"/api/acts/ad-f50-94-engine-mount-tubing-and-end-fittings/analysis","conflicts":"/api/acts/ad-f50-94-engine-mount-tubing-and-end-fittings/conflicts","importantCases":"/api/acts/ad-f50-94-engine-mount-tubing-and-end-fittings/important-cases","documents":"/api/acts/ad-f50-94-engine-mount-tubing-and-end-fittings/documents"}}