{"id":"F2006B10201","name":"AD/GAF-N22/53 - Taper Pins - Control Systems","slug":"ad-gaf-n22-53-taper-pins-control-systems","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55859,"registerId":"commonwealth-F2006B10201-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAF-N22/53 - Taper Pins - Control Systems","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nGAF N22 and N24 Series Aeroplanes\n\nAD/GAF-N22/53 Taper Pins \\- Control Systems 11/88 T\n\nApplicability: All Nomad N22, N22B, N22C, N22S, N24 and N24A aircraft.\n\nRequirement: 1. For L.H and R.H control column universal joints fitted with taper pins, not incorporating modification N428, action in accordance with Nomad Alert SB ANMD-27-39.\n\n2. For taper pins fitted to all other control systems carry out inspection for looseness or evidence of looseness.\n\nCompliance: 1. Within 10 hours time in service after 22 August 1988 and thereafter at intervals not exceeding 100 hours time in service until modification has been carried out in accordance with Part B of Nomad Alert S.B. ANMD-27-39, but not later than 300 hours time in service after 22 August 1988 or by 22 November 1988 whichever occurs first.\n\nNote: If taper pins are found loose or with evidence of looseness, modification must be carried out before further flight.\n\n2. Within 100 hours time in service after 22 August 1988 or at the next scheduled inspection for Maintenance Release issue after 22 August 1988, whichever occurs first. Thereafter at each inspection for Maintenance Release, unless modified in accordance with a scheme approved by the Authority.\n\nBackground: Excessive free movement of control column in service was caused by taper pin working loose at universal joint with the possibility of falling free.","sortOrder":0}],"analysis":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a defined aircraft fleet. It has not expanded beyond its original purpose of mandating inspection and modification of taper pins in Nomad aircraft control systems."},"complexity_factors":["Multiple applicability categories requiring different actions (control column joints vs. other control systems)","Layered compliance deadlines with 'whichever occurs first' conditional logic (10 hours/100 hours/300 hours/calendar date combinations)","Cross-reference to external technical document (Nomad Alert SB ANMD-27-39) without reproducing its contents","Defined technical terms assumed (e.g., 'time in service', 'Maintenance Release', 'L.H/R.H' for left hand/right hand)","Exception to the inspection schedule (modified aircraft exempted from ongoing inspections)"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspections and modification of taper pins in control-system joints on GAF Nomad N22/N24 series aircraft. It responds to reports of taper pins working loose in flight, which can lead to loss of control. Operators and maintenance organisations must inspect within the specified short intervals and carry out the required modification; any aircraft found with a loose pin is grounded until corrected."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive's scope is self-contained: it applies to all listed Nomad N22/N24 variants and prescribes inspections and a specific modification. The text shows no amendment or expansion beyond the stated applicability."},"complexity_factors":["Multiple aircraft variants listed in applicability (N22, N22B, N22C, N22S, N24, N24A) (Applicability).","Two-tiered requirements: specific action for L.H./R.H. control column universal joints versus other control‑system taper pins (Requirement 1–2).","Short initial compliance window for certain joints (within 10 hours TIS after 22 August 1988) and immediate grounding if pins found loose (Compliance para 1; Note).","Recurring inspection intervals until modification is performed (every ≤100 hours TIS until modification) (Compliance para 1–2).","Final compliance cutoff expressed as either flight hours or calendar date (300 hours TIS after 22 Aug 1988 or by 22 Nov 1988) (Compliance para 1).","Dependence on an external service bulletin for the mandated modification and parts of the inspection procedure (Nomad Alert SB ANMD‑27‑39) (Requirement 1).","Provision for approved alternative modification schemes subject to Authority approval (Compliance para 2: 'unless modified in accordance with a scheme approved by the Authority').","Safety‑critical context (control systems) increases operational urgency and liability risk (Background)."],"plain_english_summary":"**What it does:** Requires owners/operators of Nomad N22/N24 series aeroplanes to inspect taper pins in control‑system universal joints and, for certain column joints, to carry out a specified modification in Nomad Alert SB ANMD‑27‑39. It sets short initial inspection times, recurring checks until modification, and a final deadline. \n\n**Who it affects and why it matters:** Aircraft operators and maintenance organisations must inspect and modify parts to prevent taper pins working loose and potentially allowing control columns to fall free. Operators bear the inspection and modification costs; the Civil Aviation Safety Authority oversees compliance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gaf-n22-53-taper-pins-control-systems","history":"/api/acts/ad-gaf-n22-53-taper-pins-control-systems/history","analysis":"/api/acts/ad-gaf-n22-53-taper-pins-control-systems/analysis","conflicts":"/api/acts/ad-gaf-n22-53-taper-pins-control-systems/conflicts","importantCases":"/api/acts/ad-gaf-n22-53-taper-pins-control-systems/important-cases","documents":"/api/acts/ad-gaf-n22-53-taper-pins-control-systems/documents"}}