{"id":"F2006B10099","name":"AD/G164/14 - Elevator Control Horn Attach Bolts - Inspection and Replacement","slug":"ad-g164-14-elevator-control-horn-attach-bolts-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55597,"registerId":"commonwealth-F2006B10099-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/G164/14 - Elevator Control Horn Attach Bolts - Inspection and Replacement","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)  \nSchweizer (Grumman) G-164 (Ag-Cat) Series Aeroplanes\n\nAD/G164/14 Elevator Control Horn Attach Bolts \\- Inspection\n\nand Replacement\n\n  \n8/83\n\nApplicability: All models.\n\nRequirement: 1. Inspect the AN4-12A bolts attaching the elevator control horn, P/N A1841-3, to the left and right side elevator P/N A1201-5A and A1801-4A respectively for a standard torque rating of 50-70 in. lbs. and for corrosion. If looseness is detected remove bolts and inspect for wear. Replace worn or corroded bolts.\n\n2. Replace the AN4-12A bolts attaching the elevator control horn, P/N A1841-3, to the left and right side elevator P/N A1201-5A and A1201-4A respectively.\n\nCompliance: 1. Within the next 25 hours time in service after 1 October 1973 and thereafter at intervals not exceeding 100 hours time in service.\n\n2. At intervals not exceeding 1000 hours time in service, or 1 year whichever occurs first.\n\nBackground: This reprint is to correct a typographical error in compliance para. 2 : hourly intervals.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1816},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This version is a reprint correcting a typographical error in paragraph 2 regarding hourly intervals. The substantive safety requirements, applicability to aircraft models, and compliance timeframes remain unchanged from the original directive."},"complexity_factors":["Technical aviation part numbers and specifications (AN4-12A bolts, P/N A1841-3)","Specific torque measurement requirements (50-70 in. lbs.)","Multiple recurring compliance intervals (25/100 hours for inspection, 1000 hours/1 year for replacement)","Narrow applicability limited to single aircraft type"],"plain_english_summary":"This airworthiness directive requires owners/operators of Schweizer (Grumman) G‑164 \"Ag‑Cat\" agricultural aircraft to inspect and routinely replace the AN4‑12A bolts that attach the elevator control horn to the elevator. Corrosion or wear of these bolts can cause loss of pitch control, so the rule aims to prevent catastrophic elevator failure.\n\nInitial inspection is required within 25 flight hours and then every 100 hours; bolts must be replaced every 1,000 flight hours or 12 months (torque spec 50–70 in‑lb)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-g164-14-elevator-control-horn-attach-bolts-inspection-and-replacement","history":"/api/acts/ad-g164-14-elevator-control-horn-attach-bolts-inspection-and-replacement/history","analysis":"/api/acts/ad-g164-14-elevator-control-horn-attach-bolts-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-g164-14-elevator-control-horn-attach-bolts-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-g164-14-elevator-control-horn-attach-bolts-inspection-and-replacement/important-cases","documents":"/api/acts/ad-g164-14-elevator-control-horn-attach-bolts-inspection-and-replacement/documents"}}