{"id":"F2006B10199","name":"AD/GAF-N22/51 - Rudder Pedal Guard Plate","slug":"ad-gaf-n22-51-rudder-pedal-guard-plate","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55857,"registerId":"commonwealth-F2006B10199-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAF-N22/51 - Rudder Pedal Guard Plate","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-N22/51 Rudder Pedal Guard Plate 12/85\n\nApplicability: All models N22 and N24.\n\n \n\nRequirement: Action in accordance with GAF Service Bulletin NMD-27-34.\n\n \n\nCompliance: Within 100 hours time in service, or at the next scheduled inspection for Maintenance Release issued after 31 December 1985, whichever is the later.\n\n \n\nBackground: Jamming of the rudder pedals at full deflection has been reported. This has happened when the pedals are adjusted at or near fully aft, concurrently with landing on rough terrain, or nose wheel shimmy.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive from 1985 addressing a specific mechanical defect. It has not expanded beyond its original purpose of preventing rudder pedal jamming in GAF N22/N24 aircraft."},"complexity_factors":["Single, specific mechanical modification required","Only one defined applicability criterion (aircraft model)","Simple compliance deadline with clear alternative timing (100 hours OR next inspection)","No nested exceptions or conditional logic","Cross-reference to only one external document (manufacturer's service bulletin)","Total length: approximately 150 words"],"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 install a guard plate on the rudder pedals to prevent them from jamming.\n\n**What the problem is:**\nThe rudder pedals (foot controls that steer the aircraft on the ground) can get stuck at full deflection when:\n- The pedals are adjusted to their rearmost position, **and**\n- The aircraft lands on rough ground, **or**\n- The nose wheel experiences \"shimmy\" (rapid side-to-side vibration)\n\n**What must be done:**\n- Install a guard plate following the manufacturer's instructions in **GAF Service Bulletin NMD-27-34**\n- Complete this within **100 hours of flying time**, or at the next scheduled inspection after 31 December 1985 — whichever comes later\n\n**Who this affects:**\nAnyone who owns, operates, or maintains GAF N22 or N24 aircraft (these are Australian-made utility aircraft, often used for agricultural work and regional transport).\n\n**Why it matters:**\nJamming the rudder pedals during landing or takeoff could cause loss of directional control, potentially leading to runway excursions or accidents."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The text does not indicate any change of scope from an earlier version; it applies to all N22 and N24 models, requires action per GAF Service Bulletin NMD-27-34, and prescribes a specific compliance deadline. No expansion or narrowing of applicability or subject-matter is signalled within the document."},"complexity_factors":["Narrow applicability: applies only to GAF N22 and N24 models (Applicability).","Prescriptive but concise requirement: action is simply to follow a specific Service Bulletin (Requirement).","Compliance timing has a small conditional nuance (100 hours TIS or next scheduled inspection after 31/12/1985, whichever is later) (Compliance).","Substantive technical detail is external to the AD and contained in the referenced Service Bulletin, which requires consulting another document to implement (Requirement)."],"plain_english_summary":"Operators of all GAF N22 and N24 aeroplanes must carry out the modification or inspection in GAF Service Bulletin NMD-27-34 to address reports of rudder-pedal jamming. Work is mandatory within 100 hours time-in-service or at the next scheduled inspection for any Maintenance Release issued after 31 December 1985, whichever is later. Owners/operators are responsible for arranging and funding the required maintenance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gaf-n22-51-rudder-pedal-guard-plate","history":"/api/acts/ad-gaf-n22-51-rudder-pedal-guard-plate/history","analysis":"/api/acts/ad-gaf-n22-51-rudder-pedal-guard-plate/analysis","conflicts":"/api/acts/ad-gaf-n22-51-rudder-pedal-guard-plate/conflicts","importantCases":"/api/acts/ad-gaf-n22-51-rudder-pedal-guard-plate/important-cases","documents":"/api/acts/ad-gaf-n22-51-rudder-pedal-guard-plate/documents"}}