{"id":"F2006L00417","name":"AD/F100/76 - Main Landing Gear Outboard Door","slug":"ad-f100-76-main-landing-gear-outboard-door","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":117081,"registerId":"commonwealth-F2006L00417-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Fokker F100 (F28 Mk 100) Series Aeroplan","sectionType":"division","heading":"Fokker F100 (F28 Mk 100) Series Aeroplanes","content":"### Fokker F100 (F28 Mk 100) Series Aeroplanes\n\n| AD/F100/76 | Main Landing Gear Outboard Door | 3/2006 |\n| ---------- | ------------------------------- | ------ |\n\n| Applicability: | Model F28 Mark 0070 and Mark 0100 aircraft, all serial numbers, if equipped with Carbon-Fibre Reinforced Plastic (CFRP) Main Landing Gear Doors, Part Number D13312-401 through -410, including units held as spares. |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. Inspect the main landing gear (MLG) outboard doors for cracks in the CFRP outer skin at the countersunk heads of the operating rod bracket attachment bolts in accordance with Part 1 of Section 3, Accomplishment Instructions, of Fokker Service Bulletin SBF100-52-080, dated 12 December 2005, or later CAA-NL approved revision.2. If cracks are found, modify the MLG outboard door operating rod bracket attachment by the installation of reinforcement plates in accordance with Part 2 of Section 3, Accomplishment Instructions, of Fokker SBF100-52-080, or later CAA-NL approved revision.3. If no cracks are found, modify the MLG outboard door operating rod bracket attachment by the installation of reinforcement plates in accordance with Part 2 of Section 3, Accomplishment Instructions, of Fokker SBF100-52-080, or later CAA-NL approved revision.4. For CFRP MLG Outboard Door units held as spares, part number D13312-401 through -410, all serial numbers, modify the MLG outboard door operating rod bracket attachment by the installation of reinforcement plates in accordance with Section 3, Accomplishment Instructions, of Fokker Component Service Bulletin D13312-52-09, dated 12 December 2005, or later CAA-NL approved revision.Note: CAA-NL AD NL-2006-001 refers. |\n| Compliance: | 1. Within 9 months after 16 March 2006.2. Before further flight.3. Within 12 months after 16 March 2006.4. Within 12 months after 16 March 2006. |\n| | This Airworthiness Directive becomes effective on 16 March 2006. |\n\n| Background: | The manufacturer received a recent report of a Fokker 100 MLG outboard door rod bracket in-flight detachment. Investigation revealed that the operating rod between the MLG outboard door and the MLG fitting was broken and the rod’s bracket was detached from the outboard door. The affected parts subsequently became jammed between the MLG and the outboard door hinge. As a result, two of three adjacent hydraulic lines were damaged. Several more operators have reported finding partly detached operating rod brackets. This condition, if not corrected, could result in further events of MLG operating rod brackets breaking loose from the CFRP MLG outboard door, including the possibility of blocking the proper functioning of the main landing gear. |\n| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png) \nDavid Villiers \nDelegate of the Civil Aviation Safety Authority\n\n2 February 2006","sortOrder":0},{"sectionNumber":"AD/F100/76","sectionType":"part","heading":"AD/F100/76","content":"## AD/F100/76","sortOrder":1},{"sectionNumber":"Main Landing Gear Outboard Door","sectionType":"part","heading":"Main Landing Gear Outboard Door","content":"## Main Landing Gear Outboard Door","sortOrder":2},{"sectionNumber":"3/2006","sectionType":"part","heading":"3/2006","content":"## 3/2006","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with focused, original scope. It addresses one specific safety defect in one aircraft type without expansion into broader regulatory areas."},"complexity_factors":["Short, single-purpose document (one specific mechanical defect)","Only 4 compliance requirements with clear timelines","Minimal defined terms (only standard aviation abbreviations: MLG, CFRP, CAA-NL)","No nested exceptions or conditional logic — requirements are sequential and apply uniformly","Single external reference (Fokker Service Bulletin SBF100-52-080) with clear incorporation by reference","Simple applicability test (specific aircraft models with specific part numbers)"],"plain_english_summary":"CASA’s AD mandates owners/operators of Fokker F28 Mark 0070/0100 (F100) aircraft with CFRP main landing‑gear doors — including spares — to address a design flaw where rod‑bracket cracks can detach, jam the gear and damage hydraulics. It requires prompt inspection and installation of reinforcement plates (repairs before next flight if cracks found), with specified short compliance deadlines to eliminate the risk of gear malfunction on landing."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive targets F28 Mk 0070/0100 aircraft equipped with specific CFRP outboard doors (P/N D13312‑401 to ‑410), including spares, to prevent bracket detachment. This matches the stated aim in the Background and does not expand scope beyond the identified parts and models."},"complexity_factors":["Technical specificity: applies only to CFRP MLG outboard doors, part numbers D13312‑401 through ‑410 (Applicability).","Dependency on external documents: work must follow Fokker Service Bulletin SBF100‑52‑080 and Component Service Bulletin D13312‑52‑09 or later CAA‑NL approved revisions (Requirement).","Multiple, staggered compliance deadlines (9 months, before further flight, 12 months) increase scheduling complexity (Compliance: items 1–4).","Immediate operational impact where cracks are found—repairs required before further flight—creating potential unscheduled downtime (Compliance item 2).","Includes spares inventory in scope, imposing modification or quarantine decisions for stored parts (Requirement 4; Applicability).","Safety‑critical failure mode: bracket detachment can jam landing gear and damage hydraulic lines, elevating urgency and inspection thoroughness (Background).","Regulatory discretion: allows later CAA‑NL approved revisions of the service bulletins, creating reliance on regulator approvals for exact procedures (Requirement).","Compliance burden and cost fall to aircraft operators who must inspect, modify, and potentially ground aircraft to complete work (implied by Requirement and Compliance)."],"plain_english_summary":"Requires inspection and reinforcement of the carbon-fibre main landing‑gear outboard door operating‑rod bracket on Fokker F100 (F28 Mk 0070/0100) aeroplanes fitted with specified CFRP doors (including spares). Operators must follow the cited Fokker service bulletins (CAA‑NL approved revisions) and meet staged deadlines; if cracks are found, repair is required before further flight. The measure is aimed at preventing bracket detachment that has damaged hydraulic lines and could jam the main landing gear."},"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-f100-76-main-landing-gear-outboard-door","history":"/api/acts/ad-f100-76-main-landing-gear-outboard-door/history","analysis":"/api/acts/ad-f100-76-main-landing-gear-outboard-door/analysis","conflicts":"/api/acts/ad-f100-76-main-landing-gear-outboard-door/conflicts","importantCases":"/api/acts/ad-f100-76-main-landing-gear-outboard-door/important-cases","documents":"/api/acts/ad-f100-76-main-landing-gear-outboard-door/documents"}}