{"id":"F2008L01513","name":"AD/B737/320 - Krueger Flap Actuator Support Fitting","slug":"ad-b737-320-krueger-flap-actuator-support-fitting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":119903,"registerId":"commonwealth-F2008L01513-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 737 Series Aeroplanes","sectionType":"division","heading":"Boeing 737 Series Aeroplanes","content":"### Boeing 737 Series Aeroplanes\n\n| AD/B737/320 | Krueger Flap Actuator Support Fitting | 6/2008 |\n| ----------- | ------------------------------------- | ------ |\n\n| Applicability: | Model 737-200 series aircraft, line numbers 814 through 826.                                                                                                                                                                                                                                                                                                                                                          |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2008-06-09 Amdt 39-15421.Note: Boeing Special Attention Service Bulletin 737-57-1129 Revision 3, or later FAA approved revision, refers.                                                                                                                                                                                                               |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of5 June 2008.                                                                                                                                                                                                                                                                                                                                |\n|                | This Airworthiness Directive becomes effective on 5 June 2008.                                                                                                                                                                                                                                                                                                                                                        |\n| Background:    | The FAA received reports of cracking due to fatigue and stress corrosion of the support fittings of the Kreuger flap actuator. Undetected cracking of the support fittings could result in fracturing of the actuator attach lugs, separation of the actuator from the support fittings, severing of the hydraulic lines, resultant loss of hydraulic fluids, and consequent reduced controllability of the aircraft. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n16 April 2008","sortOrder":0},{"sectionNumber":"AD/B737/320","sectionType":"part","heading":"AD/B737/320","content":"## AD/B737/320","sortOrder":1},{"sectionNumber":"Krueger Flap Actuator Support Fitting","sectionType":"part","heading":"Krueger Flap Actuator Support Fitting","content":"## Krueger Flap Actuator Support Fitting","sortOrder":2},{"sectionNumber":"6/2008","sectionType":"part","heading":"6/2008","content":"## 6/2008","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive targeting a specific mechanical defect in a limited subset of aircraft. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 200 words of substantive content)","Only 1 defined term implicitly referenced (line numbers)","No nested conditional logic or exceptions","Single cross-reference to external FAA directive and Boeing service bulletin","Straightforward applicability criteria (specific model range)","No internal definitions section or interpretation clauses"],"plain_english_summary":"This mandatory Airworthiness Directive requires operators of Boeing 737-200 airplanes (line numbers 814–826) to inspect and repair the Krueger flap actuator fittings. Cracks from fatigue and stress corrosion could lead to actuator detachment, cut hydraulic lines, fluid loss, and degraded controllability. Affected operators must follow the referenced FAA AD and Boeing Service Bulletin procedures; this Australian AD took effect 5 June 2008."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"No substantive change to the directive's operational scope. The instrument enforces the FAA AD requirements for the specified aircraft; the only stated modification in this text is a revised effective date of 5 June 2008."},"complexity_factors":["Narrow applicability — applies only to Model 737-200, line numbers 814–826 (reduces operational scope).","Reliance on external documents — compliance requires following FAA AD 2008-06-09 and Boeing SB 737-57-1129 Rev 3 or later (cross-referencing increases administrative complexity).","Technical tasks — inspections and potential repairs for fatigue and stress-corrosion cracking require specialised maintenance skills and parts.","Safety-critical consequences — failure modes include actuator separation and loss of hydraulic fluid, creating strict compliance urgency and potential groundings.","Compliance timing — revised effective date (5 June 2008) imposes a concrete schedule for operators to act."],"plain_english_summary":"Requires operators of Boeing 737-200 aircraft (line numbers 814–826) to carry out the inspections and corrective actions specified in FAA AD 2008-06-09 and Boeing Service Bulletin 737-57-1129 Rev 3 (or a later FAA-approved revision). The directive addresses reported fatigue and stress-corrosion cracking of Krueger flap actuator support fittings; undetected cracking could fracture attach lugs, separate the actuator, sever hydraulic lines, cause hydraulic fluid loss and reduce aircraft controllability. Compliance is mandatory from 5 June 2008."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-320-krueger-flap-actuator-support-fitting","history":"/api/acts/ad-b737-320-krueger-flap-actuator-support-fitting/history","analysis":"/api/acts/ad-b737-320-krueger-flap-actuator-support-fitting/analysis","conflicts":"/api/acts/ad-b737-320-krueger-flap-actuator-support-fitting/conflicts","importantCases":"/api/acts/ad-b737-320-krueger-flap-actuator-support-fitting/important-cases","documents":"/api/acts/ad-b737-320-krueger-flap-actuator-support-fitting/documents"}}