{"id":"F2009L00140","name":"AD/PA-23/92 - Stabilator Outboard Nose Rib - Installation","slug":"ad-pa-23-92-stabilator-outboard-nose-rib-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":76575,"registerId":"commonwealth-F2009L00140-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-23 (Apache and Aztec) Series Ae","sectionType":"division","heading":"Piper PA-23 (Apache and Aztec) Series Aeroplanes","content":"### Piper PA-23 (Apache and Aztec) Series Aeroplanes\n\n| AD/PA-23/92 | Stabilator Outboard Nose Rib - Installation | 2/2009 |\n| ----------- | ------------------------------------------- | ------ |\n\n| Applicability: | All model PA-23-250 with serial numbers 27-7654001 to 27-7754041 equipped with stabilators Piper part number 15658-2, -3, -22, or -23.                                                                                                                      |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Reinforce the mounting of the stabilator tube and weight assemblies by installing additional nose ribs by means of Piper Kit 761 141 or equivalent kit in accordance with Piper SL No. 807A.Note 1: USA AD 78-02-03 (Amdt 39-3128) paragraph (d) refers. |\n|                | 2. Balance the stabilator in accordance with paragraph 4-65 of the Piper PA-23-250 “Aztec” Service Manual when the above modification is incorporated.Note 2: USA AD 78-02-03 (Amdt 39-3128) paragraph (e) refers.                                          |\n| Compliance:    | Unless already accomplished, within 100 hours time in service following the date of effectivity of this Amendment.                                                                                                                                          |\n|                | This Airworthiness Directive becomes effective on 12 February 2009.                                                                                                                                                                                         |\n| Background:    | USA AD 78-02-03 paragraphs (a) and (c) are mandated in Australia by AD/PA-23/70 and AD/PA-23/73 respectively. Paragraph (b) specifies once-only action and was previously mandated by AD/PA-23/70 Amendment 1. Paragraph (d) is mandated by this AD.        |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n24 December 2008","sortOrder":0},{"sectionNumber":"AD/PA-23/92","sectionType":"part","heading":"AD/PA-23/92","content":"## AD/PA-23/92","sortOrder":1},{"sectionNumber":"Stabilator Outboard Nose Rib - Installat","sectionType":"part","heading":"Stabilator Outboard Nose Rib - Installation","content":"## Stabilator Outboard Nose Rib - Installation","sortOrder":2},{"sectionNumber":"2/2009","sectionType":"part","heading":"2/2009","content":"## 2/2009","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":false,"description":"This is a standard, narrow Airworthiness Directive focused on a specific technical modification to a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 250 words)","Only 4 defined/applicable terms (specific aircraft model, serial number range, and 4 part numbers)","Two straightforward mechanical requirements with clear reference to manufacturer documentation","Single compliance deadline with one simple exception (\"unless already accomplished\")","No nested conditions, cross-references to other legislation, or interpretive provisions","Background section provides context but does not create additional legal obligations"],"plain_english_summary":"This AD requires owners/operators of certain Piper PA-23-250 “Aztec” aeroplanes to fit reinforcement (nose) ribs to the stabilator using Piper Kit 761141 (or approved equivalent) and rebalance the stabilator. It applies only to specified serial-numbered aircraft fitted with particular stabilator part numbers and must be done within 100 flying hours of the AD.\n\nThe action corrects a stabilator mounting weakness that could impair pitch control and aligns Australia with related U.S. safety requirements."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This AD explicitly mandates the action corresponding to paragraph (d) of USA AD 78-02-03 (installing additional stabilator outboard nose ribs) for the listed PA-23-250 serials and requires subsequent stabilator balancing. Earlier Australian ADs had mandated other paragraphs of the USA AD; this instrument extends mandatory scope to include this specific installation and balance requirement, with a 100-hour compliance window."},"complexity_factors":["Narrow applicability by make/model/serial-number and specific stabilator part numbers (requires precise aircraft identification).","Technical maintenance action: installation of a parts kit (Piper Kit 761141 or equivalent) and rebalancing to a service-manual procedure (requires certified maintenance personnel and shop time).","Compliance timing: a hard 100 hours time-in-service deadline from the AD effective date (creates scheduling pressure).","Supply and equivalence risk: allowance for an “equivalent kit” creates potential for approval differences and sourcing costs.","Cross-references to prior USA AD paragraphs and earlier Australian ADs increase regulatory traceability requirements for operators and maintainers."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Piper PA-23-250 aircraft (serial numbers 27-7654001 to 27-7754041) with stabilators P/N 15658-2, -3, -22 or -23 to fit additional outboard nose ribs using Piper Kit 761141 (or an equivalent) and to rebalance the stabilator per the Aztec service manual. Compliance must be completed within 100 hours time-in-service from the effective date (12 February 2009). The stated purpose is to reinforce the stabilator tube and weight assembly mounting; meeting it incurs parts, labour and certified-maintenance costs for owners."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-23-92-stabilator-outboard-nose-rib-installation","history":"/api/acts/ad-pa-23-92-stabilator-outboard-nose-rib-installation/history","analysis":"/api/acts/ad-pa-23-92-stabilator-outboard-nose-rib-installation/analysis","conflicts":"/api/acts/ad-pa-23-92-stabilator-outboard-nose-rib-installation/conflicts","importantCases":"/api/acts/ad-pa-23-92-stabilator-outboard-nose-rib-installation/important-cases","documents":"/api/acts/ad-pa-23-92-stabilator-outboard-nose-rib-installation/documents"}}