{"id":"F2006B02157","name":"AD/AC/96 Amdt 1 - Nose Landing Gear Bolt","slug":"ad-ac-96-amdt-1-nose-landing-gear-bolt","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41387,"registerId":"commonwealth-F2006B02157-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC/96 Amdt 1 - Nose Landing Gear Bolt","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)  \nTwin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes\n\nAD/AC/96\n\nAmdt 1\n\n  \nNose Landing Gear Bolt 8/98\n\nApplicability: Models and serial numbers of aircraft listed in Twin Commander Service Bulletin 224 Revision C.\n\nRequirement: 1. For all aircraft models except Models 690D and 695A:\n\nReplace the nose landing gear (NLG) drag link bolt, part number (P/N) ED 10055, with a new bolt in accordance with the Instructions section of Twin Commander Service Bulletin 224, Revision C.\n\n2. For aircraft Models 690D and 695A:\n\nReplace the NLG drag link bolt (P/N ED 10055), with a new bolt P/N 750076-1 in accordance with SB 224, Revision C.\n\nThe new replacement bolt must be marked with the manufacturer’s serial number, the date of manufacture, and the last three digits of the drawing number, 055, on the bolt head for all but Models 690D and 695A. Models 690D and 695A bolts must be marked with the manufacturer’s serial number, the date of manufacture, and the last three digits of the drawing number, 76-1, on the bolt head.\n\nNote: FAA AD 98-08-25 Amdt 39-10474 refers.\n\nCompliance: Unless already accomplished, within 75 hours’ time in service after 16 July 1998.\n\nThis amendment becomes effective on 16 July 1998.\n\nBackground: A number of nose landing gear drag link bolts, distributed after 8 August 1994, were improperly heat treated. Failure of an improperly heat treated bolt caused the collapse of the nose landing gear and damage to an engine and fuel tank, resulting in fuel leakage.\n\nAmendment 1 is issued in response to a new FAA AD which retains the requirements of the original AD, adds an additional model and additional serial numbers to the applicability, and requires bolt replacement on certain model aircraft.\n\nThe original issue of this airworthiness directive became effective on 1 May 1996.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"This Amendment 1 expands the original 1996 directive by adding an additional aircraft model (likely 690D or 695A) and more serial numbers to the applicability list. It also introduces a second bolt part number requirement specifically for Models 690D and 695A, whereas the original AD apparently covered only one replacement bolt type. The amendment explicitly states it 'adds an additional model and additional serial numbers' and 'requires bolt replacement on certain model aircraft' — indicating the scope grew from the original 1996 intent."},"complexity_factors":["Very short document (under 300 words)","Only 2 conditional requirements based on aircraft model","Single cross-reference to FAA AD 98-08-25","Minimal defined terms (only standard aviation abbreviations: NLG, P/N, SB)","Clear compliance deadline with simple time-in-service calculation","Straightforward applicability section referencing external service bulletin"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of specified Twin Commander 500/600/700-series aircraft to replace a potentially heat‑treat‑defective nose‑landing‑gear bolt that has caused at least one gear collapse, engine/fuel-tank damage and fuel leakage. Most models must fit a newly marked ED 10055 bolt; models 690D/695A must use part 750076‑1. The replacement deadline is within 75 flight hours after 16 July 1998. Compliance prevents landing‑gear failure, fuel leaks and attendant fire or injury risks."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 retains the original bolt-replacement requirement but expands applicability by adding an additional model and serial numbers, specifies a different replacement part number for Models 690D and 695A, and sets explicit marking requirements for replacement bolts."},"complexity_factors":["Model- and serial-number specific applicability (requires checking service bulletin for affected serials)","Different replacement part number required for Models 690D and 695A","Mandatory bolt-head marking requirements (manufacturer serial number, manufacture date, last drawing digits)","Short compliance deadline (75 flight hours from 16 July 1998)","Compliance relies on following Twin Commander Service Bulletin 224 Revision C","Cross-reference to FAA AD may require coordination or verification against foreign airworthiness directive"],"plain_english_summary":"**What it changes:** This directive requires operators of specified Twin Commander 500/600/700 series aeroplanes to replace the nose landing gear drag‑link bolt (P/N ED 10055) with a new, correctly marked bolt within 75 flight hours of 16 July 1998. \n\n**Who it affects and why it matters:** It responds to improperly heat‑treated bolts that caused a nose‑gear collapse. Aircraft owners/operators pay for replacement and inspection, must verify model‑specific part numbers and head markings, and act quickly to remain legal and safe to fly."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-96-amdt-1-nose-landing-gear-bolt","history":"/api/acts/ad-ac-96-amdt-1-nose-landing-gear-bolt/history","analysis":"/api/acts/ad-ac-96-amdt-1-nose-landing-gear-bolt/analysis","conflicts":"/api/acts/ad-ac-96-amdt-1-nose-landing-gear-bolt/conflicts","importantCases":"/api/acts/ad-ac-96-amdt-1-nose-landing-gear-bolt/important-cases","documents":"/api/acts/ad-ac-96-amdt-1-nose-landing-gear-bolt/documents"}}