{"id":"F2005L01480","name":"AD/WILGA/4 - Elevator Control System Rotational Control Rod","slug":"ad-wilga-4-elevator-control-system-rotational-control-rod","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":35341,"registerId":"commonwealth-F2005L01480-current","compilationNumber":null,"startDate":"2026-04-01","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/4 | Elevator Control System Rotational Control Rod | 8/2005 TX |\n| ---------- | ---------------------------------------------- | --------- |\n\n| Applicability: | PZL-104 Aeroplanes - All models.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Carry out an inspection of the elevator control system rotational control rod, part number (PN) WM261610 for correct security of the adjustment fork end with a safety nut.2. If the adjustment fork end is secured properly make an entry in the aircraft maintenance log. No further action is required.3. If the adjustment fork end is not appropriately secured (the safety nut loose, not tightened):a. Secure the adjustment fork end by way of pal-nut tightening; andb. Carry out a check of the adjustment of the control system and elevator deflection angles and carry out any subsequent adjustments; andc. Report the findings to the aircraft manufacturer.For aeroplanes fitted with a dual control system, rotational control rods must be checked on both controls.Note: Polish Civil Aviation Office Airworthiness Directive (AD) NumberSP-0004-2005-A dated 17 May 2005 refers. |\n| Compliance:    | 1. Before further flight, after the effective date of this Directive.2. Following the inspection detailed in Requirement 1 of this Directive.3. a. Before further flight, following completion of Requirement 1 of this Directive.b. Before further flight, following completion of Requirement 1 of this Directive.c. Following completion of Requirement 1 of this Directive.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |\n\n|             | This Airworthiness Directive becomes effective on 14 June 2005.                                                                                                                                                                                                          |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Background: | An accident occurred when the adjustment forked end of the rotational control rod in the elevator control system became loose, resulting in decoupling and blockage of the control system.The Requirements specified in this AD address the identified unsafe condition. |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n10 June 2005","sortOrder":0},{"sectionNumber":"AD/WILGA/4","sectionType":"part","heading":"AD/WILGA/4","content":"## AD/WILGA/4","sortOrder":1},{"sectionNumber":"Elevator Control System Rotational Contr","sectionType":"part","heading":"Elevator Control System Rotational Control Rod","content":"## Elevator Control System Rotational Control Rod","sortOrder":2},{"sectionNumber":"8/2005 TX","sectionType":"part","heading":"8/2005 TX","content":"## 8/2005 TX","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":2,"scope_assessment":{"changed":false,"description":"The directive remains narrowly focused on correcting a specific unsafe condition identified after an accident: verifying and, if necessary, securing the adjustment fork end on rotational control rod PN WM261610 and checking control geometry/elevator deflection. It does not broaden regulatory reach beyond that technical remedy (it applies to all PZL-104 models but only to the specified part and checks), so the scope has not grown beyond the original safety purpose described in the Background and the referenced Polish AD."},"complexity_factors":["Short document with a single clear safety focus (rotational control rod PN WM261610)","Three substantive requirements with straightforward conditional logic (secured vs not secured)","Single defined part number to identify affected hardware","Compliance timing is simple: actions required before further flight","One additional administrative step: report findings to manufacturer","A single cross-reference to an originating foreign AD (Polish AD SP-0004-2005-A)","A note about dual-control aeroplanes adding a duplication of the same check"],"plain_english_summary":"**What this directive requires**\n\n- **Who is affected:** Owners and operators of all PZL-104 (Wilga) series aeroplanes, and the maintenance personnel who service them. (Applicability)\n\n- **What you must do:**\n  - Inspect the elevator control system rotational control rod (part number WM261610) to check that the adjustment fork end is secured with a safety nut. (Requirement 1)\n  - If it is secured correctly, record the inspection in the aircraft maintenance log. No further action is required. (Requirement 2)\n  - If it is not secured correctly (for example, the safety nut is loose or not tightened):\n    - Tighten/secure the adjustment fork end using a pal-nut (a self-locking nut),\n    - Check and, if necessary, adjust the control-system geometry and the elevator deflection angles, and\n    - Report the findings to the aircraft manufacturer. (Requirement 3a–3c)\n  - For aeroplanes fitted with dual controls, perform the rotational control rod checks on both control sets. (Requirement note)\n\n- **When it must be done:**\n  - The inspection (Requirement 1) must be carried out before the next flight after the directive’s effective date. If remedial work is required, that work and the subsequent checks must also be completed before the aeroplane is flown again. Reporting to the manufacturer must be done after the inspection. (Compliance)\n\n- **Why this matters:**\n  - The directive follows an accident in which the adjustment fork end of a rotational control rod came loose, causing decoupling and blockage of the elevator control system. The stated purpose is to remove that unsafe condition by ensuring the adjustment fork end is secured and the control geometry is correct. (Background)\n\n**Practical and compliance consequences (mechanical, economic and administrative)**\n\n- Who pays and who acts: aircraft operators and their maintenance organisations must perform the inspection and any corrective work and make the logbook entry. Maintenance labour, possible minor hardware (pal-nut) and any adjustment time are operator costs. (Requirement & Compliance)\n\n- Operational impact: because the checks and any corrective work must be done before further flight, affected aeroplanes may be grounded until work is completed. The grounding time depends on inspection speed and whether corrective action is required.\n\n- Implementation details and risks: the directive identifies a specific part number (PN WM261610) and a specific failure mode (loose adjustment fork end). The directive requires tightening with a pal-nut and adjustment checks, but does not set a numerical torque or detailed adjustment procedure in the text shown; that detail may be in the aircraft maintenance manual or the referenced Polish AD. Misidentifying the part, inconsistent tightening, or incomplete re-adjustment could reduce effectiveness. Reporting to the manufacturer creates a feedback loop but adds administrative burden. (Requirement 1–3, Note)\n\n- Incentives and trade-offs: operators are incented to inspect and correct quickly to return aircraft to service. The trade-off is between immediate maintenance cost and downtime versus reducing the risk of control failure in flight. The measure imposes a narrowly targeted compliance cost on all owners/operators of the type aircraft, rather than on broader industry actors. (Applicability, Requirement, Compliance)\n\n- Scope and specificity: the directive is narrowly targeted to one component (rotational control rod PN WM261610) and one failure mode (loosened adjustment fork end). It applies to all PZL-104 models but only to that part and procedure, which keeps the compliance burden focused. The directive also explicitly requires checks on both controls where dual controls are fitted. (Applicability, Requirement note)\n\n**Reference material:** the directive refers to a Polish Civil Aviation Office AD (SP-0004-2005-A dated 17 May 2005) for the originating action; operators should consult the aircraft maintenance manual and that AD for any detailed procedures or torque values not reproduced in this directive. (Note / Background)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific mechanical failure mode identified through accident investigation. The scope remains precisely focused on the elevator control system defect that caused the accident, with no expansion into unrelated systems or operational requirements."},"complexity_factors":["Single, specific mechanical component addressed (rotational control rod PN WM261610)","Straightforward conditional logic: check nut → if secure, log it; if loose, tighten, adjust, and report","Only 3 main requirements with clear sequential steps","No cross-references to other legislation beyond a note about the Polish equivalent directive","Minimal defined terms (only standard aviation terminology like 'part number' and 'maintenance log')","Short document (approximately 300 words of substantive content)"],"plain_english_summary":"This AD requires an urgent, mandatory inspection of the PZL-104 Wilga elevator rotational control rod to verify the safety nut is correctly tightened; if loose, it must be tightened, the control system checked/adjusted, and the manufacturer notified. It affects all Wilga owners/operators and maintenance engineers and must be complied with before further flight after 14 June 2005 following an accident caused by a loose nut."}},"importantCases":[],"_links":{"self":"/api/acts/ad-wilga-4-elevator-control-system-rotational-control-rod","history":"/api/acts/ad-wilga-4-elevator-control-system-rotational-control-rod/history","analysis":"/api/acts/ad-wilga-4-elevator-control-system-rotational-control-rod/analysis","conflicts":"/api/acts/ad-wilga-4-elevator-control-system-rotational-control-rod/conflicts","importantCases":"/api/acts/ad-wilga-4-elevator-control-system-rotational-control-rod/important-cases","documents":"/api/acts/ad-wilga-4-elevator-control-system-rotational-control-rod/documents"}}