{"id":"F2006B06442","name":"AD/R22/38 Amdt 1 - Tail Rotor Gearbox Output Shaft Key","slug":"ad-r22-38-amdt-1-tail-rotor-gearbox-output-shaft-key","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47872,"registerId":"commonwealth-F2006B06442-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/R22/38 Amdt 1 - Tail Rotor Gearbox Output Shaft Key","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)  \nRobinson R22 Series Helicopters\n\nAD/R22/38\n\nAmdt 1\n\n  \nTail Rotor Gearbox Output Shaft Key 2/96\n\nApplicability: All R22 helicopters fitted with a tail rotor gearbox that was overhauled or manufactured by Robinson Helicopter Company prior to 8 June 1992.\n\nFAA AD 95-23-05 lists gearbox serial numbers that are exempt from the requirements of this AD.\n\nNote: Copies of FAA AD 95-23-05 are available from CASA Airworthiness District Offices.\n\nRequirement: 1. Unless previously accomplished in accordance with the requirements of the original issue of AD/R22/38, install alignment dots in accordance with the technical requirements of paragraph (a) of FAA AD 95-23-05.\n\n    2. Inspect for misalignment of the “alignment dots” in accordance with the technical requirements of paragraph (b) of FAA AD 95-23-05.\n\n    3. Verify the existence of both the input and output shaft keys in accordance with the technical requirements of paragraph (c) of FAA AD 95-23-05. This is terminating action for the daily preflight checks in Requirement 2.\n\nNote: FAA AD 95-23-05 supersedes FAA AD 94-17-07.\n\nCompliance: Effective date 1 February 1995;\n\n    Unless previously accomplished, before further flight.\n\n    2. Prior to the first flight of each day.\n\nNote: The Pilot in Command may carry out and certify in the Maintenance Release for the daily preflight checks required by this Directive as part of the daily preflight inspection.\n\n    3. Within the next 100 hours time in service (TIS) after the effective date of this Directive or at the next annual inspection, whichever occurs first.\n\nBackground: The manufacturer has received reports of two tail rotor gearboxes which were assembled without the key required to prevent the output gear from rotating on the output shaft. In one case the slippage occurred on the ground while in the other case a forced landing, which damaged the helicopter, resulted.\n\nThis amendment requires the additional action to disassemble the tail rotor gear box assembly in order to verify the installation of the key.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This amendment adds specific actions beyond the original directive: install alignment dots, perform daily inspections for dot misalignment, and verify existence of both input and output shaft keys—verification can require disassembling the tail-rotor gearbox. It targets R22 helicopters with Robinson gearboxes manufactured/overhauled before 8 June 1992, references FAA serial-number exemptions, and sets immediate, daily, and 100-hour/annual compliance deadlines."},"complexity_factors":["References and relies on FAA AD 95-23-05 for technical procedures, creating an external-document dependency","Requires mechanical disassembly to verify shaft key presence, which needs qualified maintenance personnel and workshop time","Imposes recurring daily preflight checks (pilot involvement) plus a separate verification within 100 hours TIS or next annual inspection","Contains applicability limits and serial-number exemptions (FAA list), requiring record checks to determine whether an individual helicopter is covered","Multiple compliance triggers and timing rules (before further flight, prior to first flight each day, within 100 TIS or next annual) add scheduling complexity"],"plain_english_summary":"Mandates alignment marks, daily preflight checks for those marks, and physical verification of the tail-rotor gearbox input and output shaft keys on affected Robinson R22 helicopters. Verification may require disassembly of the gearbox. It applies to R22s with gearboxes manufactured or overhauled by Robinson before 8 June 1992; pilots/operators must perform and certify daily checks and arrange the required inspections because missing keys have led to gear slippage and at least one forced landing."},"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":true,"description":"This is Amendment 1 to the original AD. The original directive required alignment dots and daily checks. This amendment adds a third, more invasive requirement: physically disassembling the gearbox to verify the keys exist. This expands the scope from visual monitoring to mandatory physical verification, effectively making the temporary daily checks permanent until the physical inspection is done."},"complexity_factors":["Short, single-purpose directive with only 3 requirements","Minimal defined terms (only 'time in service' abbreviated as TIS)","Heavy reliance on external document (FAA AD 95-23-05) for technical details — the actual procedure isn't reproduced here","Simple conditional logic (exemptions by serial number, compliance deadlines based on calendar or flight hours)","No nested exceptions or cross-references to other Australian legislation"],"plain_english_summary":"This CASA Airworthiness Directive mandates actions for Robinson R22 helicopters with tail rotor gearboxes overhauled or made before 8 June 1992 (some serials exempt) to prevent output-gear slippage caused by a missing shaft key.  \n\nIt requires painting alignment dots, daily pilot preflight visual checks of those dots, and a licensed mechanic’s teardown inspection within 100 flight hours or at the next annual to verify keys (ending daily checks). Licensed mechanics perform installations/inspections; pilots log daily checks."}},"importantCases":[],"_links":{"self":"/api/acts/ad-r22-38-amdt-1-tail-rotor-gearbox-output-shaft-key","history":"/api/acts/ad-r22-38-amdt-1-tail-rotor-gearbox-output-shaft-key/history","analysis":"/api/acts/ad-r22-38-amdt-1-tail-rotor-gearbox-output-shaft-key/analysis","conflicts":"/api/acts/ad-r22-38-amdt-1-tail-rotor-gearbox-output-shaft-key/conflicts","importantCases":"/api/acts/ad-r22-38-amdt-1-tail-rotor-gearbox-output-shaft-key/important-cases","documents":"/api/acts/ad-r22-38-amdt-1-tail-rotor-gearbox-output-shaft-key/documents"}}