{"id":"F2006B05379","name":"AD/P68/51 - Flight Controls","slug":"ad-p68-51-flight-controls","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45970,"registerId":"commonwealth-F2006B05379-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nPartenavia P68 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/P68/51 Flight Controls 6/2002 TX","sectionType":"part","heading":"AD/P68/51 Flight Controls 6/2002 TX","content":"# AD/P68/51 Flight Controls 6/2002 TX\n\nApplicability: All P68 Observer, Observer 2, and P68TC Observer aircraft, with serial numbers up to and including serial number 411.\n\nRequirement: Action in accordance with the requirements of VulcanAir Service Bulletin No. 110, dated 19 March 2002.\n\nNote: ENAC AD 2002-212 refers.\n\nCompliance: For Para. 2.1 Part A \\- Inspection: Before further flight after 24 April 2002, unless already accomplished.\n\nFor Para. 2.2 Part B \\- Modification: Not later than 24 May 2002, unless already accomplished.\n\nThis Airworthiness Directive becomes effective on 24 April 2002.\n\nBackground: Instances of interference between the control column interconnection chain and the engine control pedestal assembly have been reported following application of maximum nose-down pitch. The interference may be caused by incorrect longitudinal pitch control rigging adjustment, or result from application of excessive nose-down pressure after the stabilator torque tube full-travel limit has been reached.\n\n![](image.002.png)  \n\nSteven John Swift\n\nDelegate of the Civil Aviation Safety Authority 23 April 2002\n\n![](image.001.png)","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific mechanical interference issue in a limited fleet of aircraft. No scope creep is evident; it targets exactly the safety problem described in the background."},"complexity_factors":["Single, clearly defined applicability (specific aircraft models and serial number range)","Only two compliance actions required (inspection and modification)","Cross-reference to only one external document (VulcanAir Service Bulletin No. 110)","No defined terms section or interpretation provisions","Simple temporal compliance structure (fixed dates with 'unless already accomplished' exceptions)","Background explanation provided in plain language"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of specified Partenavia P68 Observer aircraft to inspect and modify the flight‑control installation to prevent the control‑column chain from fouling the engine‑control pedestal. Actions must follow VulcanAir Service Bulletin No. 110.\n\nThe inspections are required before the next flight after 24 April 2002 (if not already done) and the modification must be completed by 24 May 2002 to eliminate a potential pitch‑control jam."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The Directive is tightly focused on correcting a specific unsafe condition (interference between the control column interconnection chain and the engine control pedestal assembly) for a defined set of aircraft. It requires an inspection and, if necessary, a modification following a specific service bulletin. It does not broaden the subject matter beyond that original safety purpose, nor does it add unrelated obligations or enlarge the population of affected aircraft beyond the stated serial‑number cutoff."},"complexity_factors":["Short, single-page AD with three model types and a serial-number cutoff (serials ≤ 411).","Two required actions only: one inspection and one modification (Para. 2.1 Part A and Para. 2.2 Part B).","Fixed, short compliance dates (inspection before any further flight after 24 April 2002; modification by 24 May 2002).","Delegates technical detail to a single external document (VulcanAir Service Bulletin No. 110).","Minor cross-reference to another regulator's AD (ENAC AD 2002-212).","No nested exceptions, no multiple alternative compliance methods, and no complex conditional logic."],"plain_english_summary":"**What this instrument does (mechanically)**\n\n- Applies to Partenavia P68 Observer, Observer 2 and P68TC Observer aeroplanes with serial numbers up to and including 411.\n- Requires operators to carry out the actions set out in VulcanAir Service Bulletin No. 110 (dated 19 March 2002).\n- Requires an **inspection** (referred to as Para. 2.1 Part A of the service bulletin) to be completed **before any further flight after 24 April 2002** unless it has already been done.\n- Requires a **modification** (referred to as Para. 2.2 Part B of the service bulletin) to be completed **no later than 24 May 2002** unless it has already been done.\n- Becomes effective 24 April 2002. The AD also notes a related ENAC (Italian regulator) AD 2002-212.\n\n**Who is affected and who decides**\n\n- Aircraft owners/operators of the specified P68 models (serial numbers ≤ 411) must comply. They are the parties who will pay for and arrange the inspection and any modification.\n- The Civil Aviation Safety Authority (CASA) delegate issued the directive; maintenance organisations, licensed engineers and the operator carry out the work in accordance with the specified service bulletin.\n\n**Why it was issued (official rationale and the mechanical risk)**\n\n- The AD records that there have been reports of interference between the control column interconnection chain and the engine control pedestal assembly when maximum nose‑down pitch is applied.\n- The reported interference may be caused by incorrect longitudinal pitch control rigging or by applying excessive nose‑down pressure after the stabilator torque‑tube has reached its full‑travel limit.\n- The AD's stated purpose is to correct that unsafe condition by inspection and, where necessary, modification in accordance with the VulcanAir service bulletin.\n\n**Practical effects, costs and implementation issues**\n\n- Immediate operational effect: each affected aircraft must be inspected before it next flies after 24 April 2002, so operators must arrange inspections promptly; aircraft may be unavailable until inspection is completed.\n- Short compliance window for the modification (by 24 May 2002) creates risk of concentrated demand for qualified maintenance resources and parts, which could increase downtime or costs for operators.\n- Direct costs fall on the aircraft owner/operator (inspection labour, parts and modification work). There is no funding or exemption in the AD itself.\n- The AD delegates the technical detail to VulcanAir Service Bulletin No. 110; the precise scope of the inspection and modification, and any parts or inspection criteria, are found in that external document.\n- Compliance relies on competent maintenance action and accurate rigging; incomplete or incorrect implementation could leave the unsafe condition uncorrected, so oversight and recordkeeping are relevant.\n\n**Trade-offs and risks to note**\n\n- Benefit: reduces risk of mechanical interference that can arise during extreme nose‑down pitch and which could affect flight controls or engine controls.\n- Cost: immediate inspection requirement and a mandated modification within a month impose time and financial costs on operators, and potential scheduling pressure on maintenance providers.\n- Implementation risk: limited supply of parts or qualified technicians and any ambiguities in the service bulletin could prolong downtime or introduce variation in repairs.\n\n(Reference: AD text specifying applicability, requirement to follow VulcanAir Service Bulletin No. 110, compliance dates 24 April 2002 for inspection and 24 May 2002 for modification.)"},"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-p68-51-flight-controls","history":"/api/acts/ad-p68-51-flight-controls/history","analysis":"/api/acts/ad-p68-51-flight-controls/analysis","conflicts":"/api/acts/ad-p68-51-flight-controls/conflicts","importantCases":"/api/acts/ad-p68-51-flight-controls/important-cases","documents":"/api/acts/ad-p68-51-flight-controls/documents"}}