{"id":"F2006B10179","name":"AD/GAF-N22/32 - Trim Tab Hinge to Horizontal Stabiliser Attachment - Inspection","slug":"ad-gaf-n22-32-trim-tab-hinge-to-horizontal-stabiliser-attachment-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55824,"registerId":"commonwealth-F2006B10179-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAF-N22/32 - Trim Tab Hinge to Horizontal Stabiliser Attachment - Inspection","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  GAF N22 and N24 Series Aeroplanes\n\n \n\nAD/GAF-N22/32 Trim Tab Hinge to Horizontal Stabiliser\n\nAttachment - Inspection\n\n\n3/80\n\n \n\nApplicability: All N22 and N24 series which have had replacement trim tab hinge P/N MS20001-4 fitted in service.\n\n \n\nDocument: GAF Telex Alert SB ANMD-27-16.\n\n \n\nCompliance: Unless already accomplished, within 20 hours time in service after 14 February 1980.\n\n \n\nBackground:  An operator has had a replacement hinge fitted in which the rivet holes in the horizontal stabiliser attach section of the hinge were drilled with nil edge distance.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific manufacturing defect in a specific aircraft part. It has not expanded beyond its original purpose of mandating inspection for improperly drilled hinge rivets."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 4 operative provisions: applicability, document reference, compliance deadline, and background","No defined terms section — all terms are either common aviation parlance or explicitly identified (part numbers, aircraft models)","Single condition (replacement hinge P/N MS20001-4 fitted in service)","No cross-references to other legislation or regulatory provisions beyond the parent Civil Aviation Regulations 1998","Simple temporal compliance requirement (20 hours time in service after fixed date)"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific GAF aircraft (the N22 and N24 series) to inspect a particular part on their planes.\n\n**What it does:**\n- **Targets:** All GAF N22 and N24 aircraft that have had a specific replacement hinge installed (part number MS20001-4).\n- **The problem:** An operator discovered that some replacement hinges were drilled incorrectly — the rivet holes were too close to the edge of the metal (\"nil edge distance\"), which weakens the attachment and could cause the trim tab (a small movable surface that helps control the aircraft) to fail.\n- **What must be done:** Aircraft owners must complete an inspection within 20 hours of flying time after 14 February 1980.\n\n**Why it matters:**\nA faulty hinge could cause the trim tab to detach from the horizontal stabiliser (the tail wing that keeps the plane level). This could lead to loss of aircraft control. The directive forces a one-time inspection to catch dangerous repairs before they cause accidents."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope matches its stated intent in the source text: it targets all GAF N22 and N24 series aeroplanes that have had the replacement trim tab hinge P/N MS20001-4 fitted in service and requires inspection within a specified short time window. (Applicability; Compliance; Background)"},"complexity_factors":["Narrow technical scope limited to GAF N22 and N24 aircraft with replacement hinge P/N MS20001-4 (Applicability) — reduces stakeholder complexity.","Short compliance window: inspection within 20 hours time in service after 14 Feb 1980 (Compliance) — creates scheduling/operational urgency.","Reliance on an external technical document (GAF Telex Alert SB ANMD-27-16) for inspection details and likely corrective actions (Document) — adds procedural dependency.","Technical ambiguity in the AD text about the exact inspection method and acceptance criteria (Background + need for telex) — requires consulting the referenced bulletin.","Regulatory mandatory form (Part 39/CASA header) — limits operator discretion but simplifies legal interpretation."],"plain_english_summary":"The AD mandates a one‑time inspection of the trim‑tab hinge attachment on GAF N22/N24 aeroplanes that have had replacement hinge part MS20001‑4 fitted, to detect rivet holes with nil edge distance. It must be done within 20 hours’ time in service after 14 Feb 1980, follows GAF Telex SB ANMD‑27‑16 for procedure, and is a mandatory regulatory cost on affected owners/operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gaf-n22-32-trim-tab-hinge-to-horizontal-stabiliser-attachment-inspection","history":"/api/acts/ad-gaf-n22-32-trim-tab-hinge-to-horizontal-stabiliser-attachment-inspection/history","analysis":"/api/acts/ad-gaf-n22-32-trim-tab-hinge-to-horizontal-stabiliser-attachment-inspection/analysis","conflicts":"/api/acts/ad-gaf-n22-32-trim-tab-hinge-to-horizontal-stabiliser-attachment-inspection/conflicts","importantCases":"/api/acts/ad-gaf-n22-32-trim-tab-hinge-to-horizontal-stabiliser-attachment-inspection/important-cases","documents":"/api/acts/ad-gaf-n22-32-trim-tab-hinge-to-horizontal-stabiliser-attachment-inspection/documents"}}