{"id":"F2005L02089","name":"AD/A320/181 - Engine - Forward Bolt Mount","slug":"ad-a320-181-engine-forward-bolt-mount","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":36310,"registerId":"commonwealth-F2005L02089-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Airbus Industrie A319, A320 and A321 Ser","sectionType":"division","heading":"Airbus Industrie A319, A320 and A321 Series Aeroplanes","content":"### Airbus Industrie A319, A320 and A321 Series Aeroplanes\n\n| AD/A320/181 | Engine - Forward Bolt Mount | 9/2005 |\n| ----------- | --------------------------- | ------ |\n\n| Applicability: | Airbus A319-131, A319-132, A319-133, A320-232, A320-233, A321-131, A321-231 and A321-232 aircraft models, all aircraft serial numbers that are powered by IAE V2500 series engine with the following engine serial numbers:V10002, V10008, V10009, V10010, V10012, V10013, V10015, V10017, V10019, V10020, V10021, V10023, V10024, V10025, V10027, V10030, V10031, V10032, V10034, V10043, V10044, V10045, V10046, V10048, V10049, V10050, V10051, V10056, V10057, V10058, V10059, V10060, V10063, V10064, V10065, V10066, V10068, V10070, V10072, V10073, V10074, V10076, V10077, V10078, V10081, V10082, V10083, V10085, V10086, V10087, V10090, V10091, V10092, V10094, V10095, V10097, V10098, V10099, V10105, V10106, V10108, V10109, V10110, V10115, V10129, V10133, V10140, V10143, V10144, V10146, V10150, V10153, V10157, V10158, V10159, V10162, V10163, V10165, V10167, V10170, V10171, V10182, V10183, V10189, V10191, V10197, V10212, V10213, V10214, V10215, V10217, V10218, V10222, V10224, V10225, V10226, V10227, V10232, V10233, V10239, V10244, V10248, V10280, V10281, V10288, V10289, V10291, V10292, V10302, V10304, V10305, V10306, V10308, V10311, V10316, V10317, V10319, V10323, V10327, V10333, V10345, V10350, V10351, V10353, V10354, V10357, V10358, V10359, V10365, V10367, V10368, V10372, V10373, V10374, V10376, V10377, V10378, V10388, V10390, V10394, V10395, V10402, V10406, V10409, V10419, V10428, V10444, V10484, V10511, V10545, V10592, V10602, V10640, V10707, V10740, V10747, V10769, V10770, V10842, V10847, V10989, V11111, V11116, V11162, V11181, V11185, V11262, V11307, V11311, V11345, V11346, V11437, V11438,V10022, V10029, V10038, V10041, V10047, V10052, V10053, V10054, V10062, V10067, V10069, V10071, V10075, V10088, V10089, V10104, V10121, V10131, V10133, V10135, V10137, V10138, V10139, V10141, V10142, V10164, V10166, V10186, V10206, V10238, V10240, V10245, V10246, V10283, V10414, V10416, V10443, V10479, V10522, V10598, V10599, V10664, V10665, V10684, V10709, V10755, V10765, V10796. |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. Perform a detailed inspection of the forward engine mount primary load path components and apply all necessary corrective actions in accordance with Airbus All Operator Telex (AOT) A320-71A1036 revision 1. Accomplishment of A320 MPD check reference 712111-03 or engine shop visit are equivalent if already done within less than 2250 flight cycles before the effective date of this AD. |\n\n| | 2. Remove and reinstall the bolts attaching the engine forward mount to the engine, in accordance, with AOT A320-71A1036 revision 1.Note: DGAC AD UF-2005-117 and Airbus AOT A320-71A1036 revision 1 refers. |\n| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Compliance: | 1. a. For aircraft powered by V2530-A5 or V2533-A5 engines - within 5 days from the effective date of this Directive.b. For aircraft powered by V2522-A5, V2524-A5 or V2527-A5 engines - within 10 days from the effective date of this Directive.2. Within 2250 flight cycles from accomplishment of detailed inspection as specified in paragraph 1 of this Directive, or during the next engine shop visit, whichever occurs first. |\n| | This Airworthiness Directive becomes effective on 1 September 2005. |\n| Background: | An engine shop has confessed that during incorporation of Airbus Service Bulletin A320-71-1021, mandated by Airworthiness Directive (AD) 98-293-118(B), they have been applying an incorrect torque to the bolts Part Number 275B0307-7H attaching the engine forward mount to the engine. The effect of the lower torque values used on the bolts is a reduction in fatigue life. The bolts are part of a secondary thrust load path that is only active upon failure of the primary thrust load path. The aim of this AD is to check the integrity of the primary load path and to re-install the forward mount bolts with correct torque level. |\n\n![](image.001.png) \nDavid Villiers \nDelegate of the Civil Aviation Safety Authority\n\n20 July 2005","sortOrder":0},{"sectionNumber":"AD/A320/181","sectionType":"part","heading":"AD/A320/181","content":"## AD/A320/181","sortOrder":1},{"sectionNumber":"Engine - Forward Bolt Mount","sectionType":"part","heading":"Engine - Forward Bolt Mount","content":"## Engine - Forward Bolt Mount","sortOrder":2},{"sectionNumber":"9/2005","sectionType":"part","heading":"9/2005","content":"## 9/2005","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The AD's scope is limited and specific: it targets listed A319/A320/A321 airframes fitted with identified IAE V2500 engine serial numbers and prescribes inspection and bolt reinstallation per Airbus AOT. The text contains no indication the AD broadens or narrows scope from an earlier stated intent; it directly addresses the incorrect torque issue described in the Background and confines action to the named engines and components (Applicability; Requirement; Background)."},"complexity_factors":["Narrow applicability defined by aircraft models plus a very large, explicit list of engine serial numbers — raises administrative tracking and verification burden (Applicability).","Two distinct initial compliance deadlines depending on engine variant (5 days for V2530-A5/V2533-A5; 10 days for V2522-A5/V2524-A5/V2527-A5) — short windows increase operational disruption risk (Compliance 1.a/1.b).","Mandated inspection and 'apply all necessary corrective actions' per Airbus AOT A320‑71A1036 rev 1 — requires reliance on, and precise interpretation of, an external manufacturer document (Requirement 1).","Equivalence clause permitting recent MPD check 712111-03 or recent engine shop visit (if <2250 flight cycles) — creates conditional compliance paths and record‑checking tasks (Requirement 1 note; Compliance 2).","Physical work includes removal and re‑installation of forward mount bolts to specified torque — involves maintenance shop time, possible engine shop visit and aircraft downtime (Requirement 2).","Background cites a maintenance error (incorrect torque applied previously) — necessitates retrospective records review to identify affected maintenance events (Background).","References to other authorities/documents (DGAC AD UF-2005-117, Airbus AOT) mean operators must reconcile multiple external instruments to implement the AD (Requirement/Background).","Effective date is immediate (1 September 2005) — short lead time for logistics and parts/maintenance scheduling (Compliance/effective date)."],"plain_english_summary":"**This AD requires operators of specified Airbus A319/A320/A321 aircraft fitted with listed IAE V2500 engines to inspect the forward engine‑mount primary load path and to remove and re‑install the forward mount bolts to the correct torque, following Airbus AOT A320‑71A1036 rev 1.** It implements short compliance windows (5–10 days for the initial action, and a 2250‑flight‑cycle or next shop‑visit follow‑up) to address reduced bolt fatigue life caused by previously incorrect torque application."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This AD remains tightly focused on its original safety purpose: addressing a specific maintenance error (incorrect torque application) on a specific component (forward engine mount bolts) on specific aircraft/engine combinations. The extensive serial number list and model variations reflect the precision needed for aviation safety, not scope creep."},"complexity_factors":["Extensive serial number list: Over 200 specific engine serial numbers listed individually rather than by range or pattern","Multiple aircraft models with subtle variations (A319-131 vs A319-132 vs A319-133, etc.)","Dual compliance timelines: Different deadlines for different engine sub-types (V2530-A5/V2533-A5 vs V2522-A5/V2524-A5/V2527-A5)","Conditional compliance: Second action (bolt reinstallation) triggered by completion of first action or engine shop visit, whichever occurs first","Reference to external documents: Requires compliance with Airbus AOT A320-71A1036 revision 1 and references French DGAC AD UF-2005-117","Equivalence provision: Allows alternative compliance if specific maintenance already performed within 2250 flight cycles"],"plain_english_summary":"This AD legally requires operators of specific Airbus A319/A320/A321 aircraft with certain IAE V2500 engines to inspect and correct forward engine-mount bolts after a repair shop admitted they used incorrect (undertight) torque. It mandates near-term inspections and re-torquing/removal at the next shop visit or within a set flight-cycle limit.\n\nIt matters because undertightened backup bolts can fatigue and fail, risking engine separation if the primary mount is compromised."},"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-a320-181-engine-forward-bolt-mount","history":"/api/acts/ad-a320-181-engine-forward-bolt-mount/history","analysis":"/api/acts/ad-a320-181-engine-forward-bolt-mount/analysis","conflicts":"/api/acts/ad-a320-181-engine-forward-bolt-mount/conflicts","importantCases":"/api/acts/ad-a320-181-engine-forward-bolt-mount/important-cases","documents":"/api/acts/ad-a320-181-engine-forward-bolt-mount/documents"}}