{"id":"F2008L03329","name":"AD/AC-112/17 - Aileron Hinges and Elevator Trim Tab Hinges","slug":"ad-ac-112-17-aileron-hinges-and-elevator-trim-tab-hinges","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":120177,"registerId":"commonwealth-F2008L03329-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Gulfstream (Rockwell) 112 Series Aeropla","sectionType":"division","heading":"Gulfstream (Rockwell) 112 Series Aeroplanes","content":"### Gulfstream (Rockwell) 112 Series Aeroplanes\n\n| AD/AC-112/17 | Aileron Hinges and Elevator Trim Tab Hinges | 10/2008 |\n| ------------ | ------------------------------------------- | ------- |\n\n| Applicability: | Model 112 aircraft, serial numbers 3 through 120.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | (a) Inspect all hinge halves of both ailerons and both elevator trim tabs from underside of aircraft to determine if the hinges are of the formed type made by rolling the edge of a 0.040 inch thick flat sheet, or of the extruded type 0.060 inch thick.(b) If extruded hinge halves are found in all locations, no further action is required.(c) If a formed hinge piece is found, that complete hinge must be replaced with Rockwell Commander Part No. 42251-1 for the aileron hinges or Rockwell Commander Part No. 44020-5 for the elevator trim tab hinges before further flight.If no cracks are visually evident in any formed hinges, the aircraft may be flown to a base where the replacement can be performed.Note: FAA AD 73-24-01 Amdt 39-1743, and Rockwell International Service Bulletin No. SB-112-6 original issue, or later FAA approved revision, refer. |\n| Compliance:    | Unless already accomplished, before 30 September 2008.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n|                | This Airworthiness Directive becomes effective on 25 September 2008.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |\n| Background:    | This Directive requires an inspection to determine whether the hinge halves of both ailerons and both elevator trim tabs are of a formed type or extruded type, and replacement if necessary. This Directive is issued to ensure compliance of future imported aircraft.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n11 August 2008","sortOrder":0},{"sectionNumber":"AD/AC-112/17","sectionType":"part","heading":"AD/AC-112/17","content":"## AD/AC-112/17","sortOrder":1},{"sectionNumber":"Aileron Hinges and Elevator Trim Tab Hin","sectionType":"part","heading":"Aileron Hinges and Elevator Trim Tab Hinges","content":"## Aileron Hinges and Elevator Trim Tab Hinges","sortOrder":2},{"sectionNumber":"10/2008","sectionType":"part","heading":"10/2008","content":"## 10/2008","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":3,"scope_assessment":{"changed":false,"description":"Scope is limited to Gulfstream (Rockwell) Model 112 serial numbers 3–120 and requires inspection and replacement as specified. The Directive’s stated purpose is to ensure compliance of future imported aircraft; it does not expand applicability beyond the listed models/serials (Applicability; Background)."},"complexity_factors":["Narrow applicability (Model 112, S/N 3–120) reduces scope and stakeholder variety (Applicability).","Simple binary identification task (formed 0.040\" vs extruded 0.060\") but requires access under the aircraft and basic inspection skill (Requirement (a)).","Clear mandated remedy: replace formed hinge with specific part numbers for aileron or trim tab before further flight (Requirement (c)).","Permits limited operational flexibility: aircraft may be ferried to a maintenance base if formed hinges show no visible cracks, lowering immediate grounding costs but adding carriage risk (Requirement (c)).","Fixed compliance deadline and effective date create a short administrative timeline for owners/operators (Compliance).","Cross‑references to FAA AD and Rockwell Service Bulletin create a reliance on external documents for procedural details (Note to Requirement).","Costs fall chiefly on aircraft owners/operators (inspection and replacement parts); regulator discretion minimal given prescriptive parts and actions (Requirement, Compliance)."],"plain_english_summary":"Requires inspection, from under the aircraft, of all aileron and elevator trim‑tab hinge halves on Gulfstream (Rockwell) Model 112 aircraft (serial numbers 3–120) to distinguish formed (0.040\") from extruded (0.060\") hinge halves, and mandates replacing any formed hinge with specified Rockwell Commander parts before further flight. Applies to owners/operators of affected aircraft who must pay for inspection and any replacements; aircraft may be ferried to a maintenance base if formed hinges show no visible cracks. Purpose stated: ensure compliance of future imported aircraft."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a straightforward, targeted safety directive focused specifically on identifying and replacing potentially defective hinge components. The scope remains tightly confined to the original safety purpose with no evidence of scope creep or expansion beyond the specific mechanical issue identified."},"complexity_factors":["Very short document (approximately 250 words)","Only 2 defined part numbers (42251-1 and 44020-5)","Simple conditional logic: inspect → identify type → replace if formed, or clear if extruded","Single exception clause for ferry flights to maintenance base","No cross-references to other legislation beyond a note referencing FAA AD and Service Bulletin for information","Clear applicability limited to specific aircraft model and serial number range"],"plain_english_summary":"This AD requires owners/operators of Gulfstream (Rockwell) 112 series (S/N 3–120) to inspect aileron and elevator trim tab hinge halves from beneath, identify whether hinges are thin “formed” (0.040\") or stronger “extruded” (0.060\"), and replace any formed hinge with specified Rockwell Commander parts before further flight (one ferry flight allowed if no cracks). Effective 25 Sep 2008; compliance due 30 Sep 2008. It addresses a safety-critical risk of hinge failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-112-17-aileron-hinges-and-elevator-trim-tab-hinges","history":"/api/acts/ad-ac-112-17-aileron-hinges-and-elevator-trim-tab-hinges/history","analysis":"/api/acts/ad-ac-112-17-aileron-hinges-and-elevator-trim-tab-hinges/analysis","conflicts":"/api/acts/ad-ac-112-17-aileron-hinges-and-elevator-trim-tab-hinges/conflicts","importantCases":"/api/acts/ad-ac-112-17-aileron-hinges-and-elevator-trim-tab-hinges/important-cases","documents":"/api/acts/ad-ac-112-17-aileron-hinges-and-elevator-trim-tab-hinges/documents"}}