{"id":"F2008L04074","name":"AD/P68/32 Amdt 1 - Longitudinal Trim System","slug":"ad-p68-32-amdt-1-longitudinal-trim-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":75946,"registerId":"commonwealth-F2008L04074-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Partenavia P68 Series Aeroplanes","sectionType":"division","heading":"Partenavia P68 Series Aeroplanes","content":"### Partenavia P68 Series Aeroplanes\n\n| AD/P68/32 Amdt 1 | Longitudinal Trim System | 12/2008 |\n| ---------------- | ------------------------ | ------- |\n\n| Applicability: | All models with serial numbers 1 through 404, 407, 408 and 411.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Check the stabilator trim system and adjust as necessary to the requirements specified in the aircraft Maintenance Manual.                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| Compliance:    | At each scheduled inspection for Maintenance Release issue.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n|                | This Amendment becomes effective on 20 November 2008.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n| Background:    | This aircraft has a long history of trim-related problems. Those problems, and a CASA test programme in 1989, have highlighted deficiencies within the trim system. Only a high level of maintenance integrity will ensure continued safe operation of the trim system in its current configuration.Vulcanair has developed an improved trim system and installed it as MOD P68/031 Rev 1. Amendment 1 excludes aircraft with the improved trim system. The compliance period has been extended from 50 hours to each Maintenance Release inspection. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n8 October 2008","sortOrder":0},{"sectionNumber":"AD/P68/32 Amdt 1","sectionType":"part","heading":"AD/P68/32 Amdt 1","content":"## AD/P68/32 Amdt 1","sortOrder":1},{"sectionNumber":"Longitudinal Trim System","sectionType":"part","heading":"Longitudinal Trim System","content":"## Longitudinal Trim System","sortOrder":2},{"sectionNumber":"12/2008","sectionType":"part","heading":"12/2008","content":"## 12/2008","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"The original AD (implied by 'Amendment 1') required checks every 50 flight hours. This amendment relaxes that to 'each scheduled inspection for Maintenance Release issue' (typically annual or 100-hourly) and excludes aircraft with the improved trim system. The scope has narrowed — fewer aircraft affected and less frequent compliance required."},"complexity_factors":["Very short document (under 300 words)","Only 4 defined elements: applicability by serial number, specific modification exclusion (MOD P68/031 Rev 1), compliance timing, and reference to external Maintenance Manual","Single operational requirement with one clear exception","No nested conditional logic or cross-references to other legislation","Straightforward compliance mechanism (scheduled inspection)","Minimal regulatory machinery — essentially a maintenance bulletin with legal force"],"plain_english_summary":"This AD mandates regular inspection and adjustment of the longitudinal trim system on specified Partenavia P68 aeroplanes (s/n 1–404, 407, 408, 411) because of a history of trim failures that can affect flight safety. It exempts aircraft fitted with the improved trim MOD P68/031 Rev 1 and, in this amendment, moves checks to every Maintenance Release inspection rather than every 50 flight hours."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 narrows covered aircraft by excluding those fitted with the improved Vulcanair trim (MOD P68/031 Rev 1) and alters the compliance rhythm by extending the compliance period from a 50‑hour check to inspection at each scheduled Maintenance Release. This reduces scope for modified aircraft while increasing recurring inspection obligations for the remaining fleet (Background; Compliance)."},"complexity_factors":["Narrow applicability: specific serial numbers listed (Applicability).","Technical content: requires maintenance actions to exact procedures in the Maintenance Manual rather than prescribing step‑by‑step in the AD (Requirement).","Operational timing change: compliance interval changed from a 50‑hour check to every Maintenance Release, creating recurring compliance burden (Compliance; Background).","Exemption clause: aircraft with MOD P68/031 Rev 1 (improved trim) are excluded, creating a bifurcated fleet status (Background).","Low regulatory discretion: measure is prescriptive about inspection frequency and references existing manuals rather than new enforcement mechanisms (Requirement; Compliance)."],"plain_english_summary":"This AD requires owners/operators of Partenavia P68 aeroplanes (serial numbers 1–404, 407, 408 and 411) to inspect and, if necessary, adjust the stabilator (longitudinal) trim system per the aircraft Maintenance Manual at each scheduled Maintenance Release inspection. Effective 20 November 2008, aircraft fitted with the improved Vulcanair trim (MOD P68/031 Rev 1) are excluded. The directive shifts recurring inspection and maintenance costs to operators and replaces a prior 50‑hour check with inspection at every Maintenance Release to address CASA‑identified trim deficiencies."}},"importantCases":[],"_links":{"self":"/api/acts/ad-p68-32-amdt-1-longitudinal-trim-system","history":"/api/acts/ad-p68-32-amdt-1-longitudinal-trim-system/history","analysis":"/api/acts/ad-p68-32-amdt-1-longitudinal-trim-system/analysis","conflicts":"/api/acts/ad-p68-32-amdt-1-longitudinal-trim-system/conflicts","importantCases":"/api/acts/ad-p68-32-amdt-1-longitudinal-trim-system/important-cases","documents":"/api/acts/ad-p68-32-amdt-1-longitudinal-trim-system/documents"}}