{"id":"F2006B09810","name":"AD/F28/76 - Landing Gear Locking Mechanism","slug":"ad-f28-76-landing-gear-locking-mechanism","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54733,"registerId":"commonwealth-F2006B09810-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F28/76 - Landing Gear Locking Mechanism","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Fokker F28 Series Aeroplanes\n\n \n\nAD/F28/76 Landing Gear Locking Mechanism 3/95\n\nApplicability: All F28 aircraft serial number 11003 through 11241, 11991 and 11992. Requirement:  Unless previously carried out action in accordance with Fokker SB F28/32-153.\n\nNote: RLD BLA AD 94-163 (A) refers.\n\n \n\nCompliance: By 1 November 1995.\n\n \n\nBackground: The manufacturer has advised that a Fokker 100 experienced a main undercarriage collapse during landing. Subsequent investigation confirmed that no undercarriage component had failed but extreme inward side-load conditions during the landing caused the lock toggle link to be pulled out of the overcentre position resulting in a main gear collapse.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive is targeted and incident‑driven: it requires the action in Fokker SB F28/32-153 for a specified list of serial numbers to address the collapse mechanism identified in the investigation (Applicability, Requirement, Background). It does not broaden applicability beyond those serial numbers or add additional categories of aircraft; therefore the scope has not been expanded beyond the instrument’s stated, incident‑specific focus."},"complexity_factors":["Limited and specific applicability to a small set of serial numbers (Applicability)","Remedy is specified by reference to an external manufacturer service bulletin rather than detailed in the AD (Requirement)","Fixed compliance deadline creates scheduling and operational coordination burdens (Compliance)","Cross‑reference to a prior AD that may interact with obligations (Note)","Legal enforcement under Civil Aviation Regulations Part 39 provides regulatory force but does not add technical detail (header)"],"plain_english_summary":"This AD requires owners/operators of Fokker F28 aircraft (s/n 11003–11241, 11991–11992) to carry out the work in Fokker Service Bulletin F28/32‑153 by 1 November 1995 (unless already done). It responds to a risk that extreme side‑loads can pull a lock toggle link out of overcentre, allowing main‑gear collapse. CASA enforces the deadline; compliance costs, downtime, and implementation risk fall on the affected operators."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating a landing gear fix."},"complexity_factors":["Very short document (under 200 words)","Only one substantive requirement (comply with manufacturer service bulletin F28/32-153)","Simple applicability test (specific serial number ranges)","Single compliance deadline with no conditional extensions or exceptions","No defined terms section — uses plain language and references external technical documents","No nested logic or cross-references to other legislation beyond a note about a Dutch aviation authority directive"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) telling aircraft owners and operators they must fix a specific mechanical problem.\n\n**What it does:** Orders owners of certain Fokker F28 series aircraft to inspect and modify the landing gear locking mechanism. The fix involves following instructions in a manufacturer service bulletin (Fokker SB F28/32-153).\n\n**Why it matters:** A Fokker 100 aircraft (similar design) suffered a main landing gear collapse during landing. Investigation found no part actually broke — instead, extreme sideways forces during landing pulled the \"lock toggle link\" out of its locked position. This is a critical safety issue: if your landing gear collapses on touchdown, the aircraft skids along the runway, potentially causing serious damage, injury, or worse.\n\n**Who must comply:** Anyone operating Fokker F28 aircraft with serial numbers 11003 through 11241, plus two additional specific aircraft (11991 and 11992). The work had to be completed by 1 November 1995.\n\n**Key point:** This isn't optional maintenance advice — it's legally enforceable. Operating an aircraft without complying with an AD can ground the aircraft and expose operators to penalties."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f28-76-landing-gear-locking-mechanism","history":"/api/acts/ad-f28-76-landing-gear-locking-mechanism/history","analysis":"/api/acts/ad-f28-76-landing-gear-locking-mechanism/analysis","conflicts":"/api/acts/ad-f28-76-landing-gear-locking-mechanism/conflicts","importantCases":"/api/acts/ad-f28-76-landing-gear-locking-mechanism/important-cases","documents":"/api/acts/ad-f28-76-landing-gear-locking-mechanism/documents"}}