{"id":"F2009L03019","name":"AD/WILGA/5 - Fuselage Front Posts","slug":"ad-wilga-5-fuselage-front-posts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":80559,"registerId":"commonwealth-F2009L03019-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"PZL 104 (Wilga) Series Aeroplanes","sectionType":"division","heading":"PZL 104 (Wilga) Series Aeroplanes","content":"### PZL 104 (Wilga) Series Aeroplanes\n\n| AD/WILGA/5 | Fuselage Front Posts | 9/2009 |\n| ---------- | -------------------- | ------ |\n\n| Applicability: | Model PZL-104 Wilga 35, 35A and 80 aircraft, all serial numbers. |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. For aircraft which have accumulated 12 years or more from the last overhaul at the effective date of this Directive:a. Inspect the fuselage front posts for corrosion in accordance with paragraph 6.A. of EADS PZL “Warszawa-Okecie” S.A. Mandatory Bulletin (MB)No. 1109185 initial issue, or later EASA approved revision, for PZL-104 Wilga 35 and 35A aircraft; and MB No. 10409036 initial issue, or later EASA approved revision, for PZL-104 Wilga 80 aircraft.If serious corrosion damage is detected that meets the criteria defined in paragraph 6.A.c of the applicable Requirement document, before further flight, repair in accordance with an approved repair scheme or replace with a serviceable part, as necessary.b. Replace the padding of the rear glass in accordance with paragraph 6.C. of MB No. 1109185 initial issue, or later EASA approved revision, forPZL-104 Wilga 35 and 35A aircraft; and MB No. 10409036 initial issue, or later EASA approved revision, for PZL-104 Wilga 80 aircraft.2. For all aircraft:Amend the approved operator’s aircraft maintenance programme to incorporate the applicable tasks as described in the relevant PZL-104 Wilga 35 or PZL-104 Wilga 80 Maintenance Manuals titled “Maintenance Instructions and Scheduled Inspections”.Note: EASA AD 2009-0072R1 refers. |\n| Compliance: | For Requirement 1 and 2: Within 6 months after 27 August 2009. |\n| | This Airworthiness Directive becomes effective on 27 August 2009. |\n\n| Background: | An inspection of a PZL-104 Wilga aircraft with a long operational background revealed severe corrosion of the steel front fuselage structural elements. Such corrosion, if left uncorrected, could lead to loss of strength of the structural front posts and consequent reduction of the structural integrity of the aircraft. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png) \nDavid Villiers \nDelegate of the Civil Aviation Safety Authority\n\n15 July 2009","sortOrder":0},{"sectionNumber":"AD/WILGA/5","sectionType":"part","heading":"AD/WILGA/5","content":"## AD/WILGA/5","sortOrder":1},{"sectionNumber":"Fuselage Front Posts","sectionType":"part","heading":"Fuselage Front Posts","content":"## Fuselage Front Posts","sortOrder":2},{"sectionNumber":"9/2009","sectionType":"part","heading":"9/2009","content":"## 9/2009","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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive applies to the stated Wilga models (all serial numbers) and requires inspection, repair/replacement, padding replacement and amendment of maintenance programmes to address corrosion. It implements targeted remedial and recurring tasks based on discovered corrosion and does not expand the regulated population or add activities beyond inspection/repair and maintenance‑programme changes as described in the source (Applicability; Requirement; Compliance)."},"complexity_factors":["Applicability to specific models (PZL‑104 Wilga 35, 35A, 80) but to all serial numbers — administrative simplicity in scope but broad population","12‑year since-last‑overhaul threshold creates a time-based applicability test (Requirement 1)","Mandatory reference to external Mandatory Bulletins (MB No. 1109185 and MB No. 10409036) and their paragraph criteria (e.g. paragraph 6.A, 6.A.c, 6.C)","Requirement to repair \"in accordance with an approved repair scheme\" or replace before further flight — dependency on approval processes","Obligation to amend the operator’s approved maintenance programme to add tasks from the manufacturer maintenance manuals (Requirement 2)","Six‑month compliance deadline from 27 August 2009 creates a short implementation window (Compliance)","Cross‑reference to EASA AD 2009‑0072R1 and requirement for EASA‑approved revisions increases regulatory coordination","Safety‑critical ‘before further flight’ precedence increases operational urgency where severe corrosion is found"],"plain_english_summary":"Mechanically: requires operators of PZL‑104 Wilga 35, 35A and 80 aircraft to inspect front fuselage posts for corrosion (aircraft with 12+ years since last overhaul), repair or replace any seriously corroded parts before further flight, replace rear‑glass padding, and incorporate the specified tasks into the maintenance programme. (Requirement; Compliance.)\n\nThe Directive cites discovery of severe corrosion that could weaken front posts and reduce structural integrity. Operators pay for inspections, repairs and administrative changes and must follow the EADS PZL mandatory bulletins and EASA‑approved repair schemes."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, targeted Airworthiness Directive addressing a specific safety-of-flight issue (corrosion in fuselage front posts). The scope remains tightly focused on the original safety concern identified in the background — severe corrosion of steel front fuselage elements in PZL-104 Wilga aircraft. There is no evidence of scope creep; the directive does not expand beyond the specific structural inspection and maintenance program amendment required to address this known defect."},"complexity_factors":["Short, single-purpose directive focused on one specific airframe issue","Only 2 main requirements with clear applicability thresholds (12-year age cutoff)","Heavy reliance on external technical documents (EADS PZL Mandatory Bulletins and Maintenance Manuals) — the actual inspection procedures are not reproduced in the directive itself","Cross-reference to European aviation safety regulation (EASA AD 2009-0072R1) without reproducing its content","Minimal defined terms (only implicit definitions through model numbers and document references)","Simple conditional logic: 'if serious corrosion detected, then repair/replace before further flight'"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of PZL‑104 Wilga (35, 35A, 80) to inspect and, if needed, repair the fuselage front posts (steel structural supports) because severe corrosion was found that could cause structural failure. Owners of aircraft with 12+ years since last overhaul must also replace rear window padding, and all operators must add scheduled inspections to their maintenance programs. Actions were required within 6 months of 27 August 2009."}},"importantCases":[],"_links":{"self":"/api/acts/ad-wilga-5-fuselage-front-posts","history":"/api/acts/ad-wilga-5-fuselage-front-posts/history","analysis":"/api/acts/ad-wilga-5-fuselage-front-posts/analysis","conflicts":"/api/acts/ad-wilga-5-fuselage-front-posts/conflicts","importantCases":"/api/acts/ad-wilga-5-fuselage-front-posts/important-cases","documents":"/api/acts/ad-wilga-5-fuselage-front-posts/documents"}}