{"id":"F2009L03364","name":"AD/G164/14 Amdt 1 - Elevator Control Horn Attach Bolts - Inspection and Replacement","slug":"ad-g164-14-amdt-1-elevator-control-horn-attach-bolts-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":140935,"registerId":"commonwealth-F2009L03364-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Schweizer (Grumman) G-164 (Ag-Cat) Serie","sectionType":"division","heading":"Schweizer (Grumman) G-164 (Ag-Cat) Series Aeroplanes","content":"### Schweizer (Grumman) G-164 (Ag-Cat) Series Aeroplanes\n\n| AD/G164/14 Amdt 1 | Elevator Control Horn AttachBolts - Inspection and Replacement | 10/2009 |\n| ----------------- | -------------------------------------------------------------- | ------- |\n\n| Applicability: | All model G-164A and G-164B aircraft not modified to Gulfstream American Service Note No. 23.                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Inspect the bolts attaching the Elevator Control Horn P/No. A1841-3 to the left and right side elevators P/No’s A1201-5A and A1201-4A respectively for looseness, wear and corrosion, and a standard torque rating of 50-70 in. lbs. Replace worn or corroded bolts.Note 1: Refer to revision to Grumman American Service Bulletin (SB) No. 51 for correct part numbers and alternative bolts.2. Replace bolts referenced in Requirement 1.Note 2: FAA AD 73-19-10 refers.                                                            |\n| Compliance:    | 1. At intervals not exceeding 100 hours time in service or 60 days from time of compliance with previous issue if this Directive, whichever occurs first.2. At intervals not exceeding 1000 hours time in service or one year from time of compliance with previous issue if this Directive, whichever occurs first.The repetitive inspection internals required by Requirement 1 may be discontinued upon installation of the modification kit to modify the elevator horn assembly referenced in Grumman American Service Note No. 23. |\n|                | This Amendment becomes effective on 24 September 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |\n| Background:    | This amendment better reflects the requirements of FAA AD 73-19-10, corrects a typographical error, includes a 60 day inspection interval required by the FAA and introduces terminating action for Requirement 1.                                                                                                                                                                                                                                                                                                                       |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n12 August 2009","sortOrder":0},{"sectionNumber":"AD/G164/14 Amdt 1","sectionType":"part","heading":"AD/G164/14 Amdt 1","content":"## AD/G164/14 Amdt 1","sortOrder":1},{"sectionNumber":"Elevator Control Horn AttachBolts - Insp","sectionType":"part","heading":"Elevator Control Horn AttachBolts - Inspection and Replacement","content":"## Elevator Control Horn Attach  \nBolts - Inspection and Replacement","sortOrder":2},{"sectionNumber":"10/2009","sectionType":"part","heading":"10/2009","content":"## 10/2009","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This amendment adjusts the AD to better match FAA AD 73-19-10: it corrects a typographical error, adds a 60‑day inspection interval, and introduces a terminating action (installation of the modification kit referenced in Service Note No. 23) that stops repetitive inspections. Applicability remains focused on all G-164A and G-164B aircraft not already modified per Service Note No. 23 (Background; Applicability; Compliance)."},"complexity_factors":["Technical subject-matter limited to a specific component (elevator control horn attach bolts) which reduces legal breadth but requires technical compliance understanding (Requirement).","Multiple, overlapping compliance intervals: short-term repetitive check (100 hours or 60 days) and longer-term interval (1000 hours or one year) creating scheduling complexity (Compliance).","Applicability carve-out: applies only to G-164A/B not modified per Service Note No. 23, requiring operators to verify modification status (Applicability).","References to external documents and authorities (Grumman American Service Bulletin/Service Note and FAA AD 73-19-10) introduce dependency on other texts for part numbers and terminating action details (Requirement; Background).","Presence of a terminating action (installation of a modification kit) shifts long‑run compliance costs and creates an operational decision point for owners/operators (Compliance; Requirement).","Explicit part numbers and torque specification elevate precision requirements for maintenance personnel and record-keeping (Requirement)."],"plain_english_summary":"This airworthiness directive requires operators of Schweizer (Grumman) G‑164A and G‑164B Ag‑Cat aircraft (unless already modified per Gulfstream American Service Note No. 23) to inspect the bolts that attach the elevator control horns for looseness, wear and corrosion, and to replace any damaged bolts and meet the specified torque. Inspections repeat at specified short and long intervals until a modification kit is installed to terminate the inspections; aircraft owners/operators pay for inspections, repairs and any modification. (Background: aligns with FAA AD 73-19-10.)"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment remains tightly scoped to its original purpose: ensuring elevator control horn bolt integrity on G-164 aircraft. The amendment makes minor corrections (typo fix, alignment with FAA requirements, adding terminating action) without expanding the aircraft covered or introducing new systems. The scope has not grown beyond the original safety intent."},"complexity_factors":["Short, single-purpose directive with only 2 substantive requirements","Clear applicability statement limiting scope to specific aircraft models","Simple conditional logic (intervals based on 'whichever occurs first')","Single cross-reference to FAA AD 73-19-10 and manufacturer service documents","Minimal defined terms (only standard aviation part numbers referenced)","Straightforward terminating action (modification kit installation ends inspection requirement)","Some formatting inconsistencies and repetition in the source document (appears to be PDF conversion artifacts) but does not affect legal substance"],"plain_english_summary":"Owners/operators of Schweizer (Grumman) G‑164 Ag‑Cat (G‑164A/B) aircraft must inspect the bolts attaching the elevator control horns for looseness, wear or corrosion and torque them correctly, and replace any worn/corroded bolts. Inspections are required every 100 flight hours or 60 days; bolt replacement every 1,000 hours or annually. Installing Gulfstream American Service Note No. 23 modification ends the repetitive inspections. This prevents elevator failure and potential loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-g164-14-amdt-1-elevator-control-horn-attach-bolts-inspection-and-replacement","history":"/api/acts/ad-g164-14-amdt-1-elevator-control-horn-attach-bolts-inspection-and-replacement/history","analysis":"/api/acts/ad-g164-14-amdt-1-elevator-control-horn-attach-bolts-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-g164-14-amdt-1-elevator-control-horn-attach-bolts-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-g164-14-amdt-1-elevator-control-horn-attach-bolts-inspection-and-replacement/important-cases","documents":"/api/acts/ad-g164-14-amdt-1-elevator-control-horn-attach-bolts-inspection-and-replacement/documents"}}