{"id":"F2006B09693","name":"AD/F27/126 - Wing Attachment Fitting Bolts","slug":"ad-f27-126-wing-attachment-fitting-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115849,"registerId":"commonwealth-F2006B09693-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F27/126 - Wing Attachment Fitting Bolts","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 F27 Series Aeroplanes\n\n \n\nAD/F27/126 Wing Attachment Fitting Bolts 12/91\n\nApplicability: Model F27 S/No 10102 thru 10259, if in pre-SB F27/53-60 (Part II) - config. Requirement:               Action in accordance with the Technical Requirements of RLD AD 91-067.\n\nNote: Fokker SB F27/53-115 refers.\n\n \n\nCompliance: As specified in the Requirement Document with a revised effective date of 12 December 1991 for Australian registered aircraft.\n\n \n\nBackground: Report of loose or sheared bolts and screws which connect fuselage main frame STA 7961 and STA 9439.5 to the outboard wing attachment fittings. The effective date required by the RLD is extended by approximately four months.\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\n \n","sortOrder":0}],"analysis":{"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 model. It has not expanded beyond its original purpose of mandating inspection/replacement of wing attachment bolts."},"complexity_factors":["Very short document (under 200 words)","Only 3 defined elements: applicability range, compliance date, and reference document","Single technical requirement with direct reference to external standard (RLD AD 91-067)","No nested conditions or exceptions — straightforward applicability test (serial number range + configuration status)","No cross-references to other legislation or regulations beyond the cited service bulletins","Simple linear structure: applicability → requirement → compliance → background"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** It orders owners and operators of certain Fokker F27 aircraft to inspect and fix a dangerous problem with bolts that attach the wings to the fuselage (the main body of the plane). Some of these bolts were found to be loose or broken, which could cause the wing to separate from the aircraft — obviously catastrophic.\n\n**Who it affects:**\n- **Aircraft:** Fokker F27 model aircraft with serial numbers 10102 through 10259\n- **Specific configuration:** Only those that haven't been modified according to a specific Fokker service bulletin (SB F27/53-60 Part II)\n- **Operators:** Anyone flying these specific Australian-registered planes\n\n**What must be done:** Operators must follow the technical instructions in a Dutch aviation safety document (RLD AD 91-067) — the Netherlands is where Fokker was based. There's also a newer Fokker service bulletin (SB F27/53-115) that provides relevant guidance.\n\n**When:** The work must be completed by 12 December 1991 for Australian-registered aircraft. This deadline is about four months later than what the Dutch authorities required, giving Australian operators extra time.\n\n**Why it matters:** Broken or loose wing attachment bolts could lead to structural failure and potentially cause a crash. This directive ensures the problem is identified and fixed before it becomes deadly."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The AD does not change which aircraft or parts are covered; it modifies the compliance timing for Australian-registered aircraft by specifying a revised effective date of 12 December 1991 (the instrument states the RLD effective date is extended by approximately four months). (Background; Compliance)"},"complexity_factors":["Short text but multiple external cross-references (RLD AD 91-067 and Fokker SB F27/53-115) which require consulting other technical documents.","Applicability is narrowly delimited by serial number range and a specific pre-service-bulletin configuration, requiring per-aircraft assessment.","Compliance timing altered (revised effective date), adding a scheduling/administrative element.","Technical work is not described in this AD; the substantive technical complexity resides in the referenced documents rather than in this instrument itself.","Low legal complexity within the AD text itself (clear obligation by reference), so limited statutory interpretation is required."],"plain_english_summary":"This AD requires owners/operators of Fokker F27 airframes S/No 10102–10259 in the pre‑SB F27/53‑60 (Part II) configuration to carry out the technical actions specified in RLD AD 91‑067 (with Fokker SB F27/53‑115 referenced). It was issued after reports of loose/sheared bolts at fuselage stations that attach the outboard wing fittings; Australian operators get a revised compliance effective date of 12 December 1991."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f27-126-wing-attachment-fitting-bolts","history":"/api/acts/ad-f27-126-wing-attachment-fitting-bolts/history","analysis":"/api/acts/ad-f27-126-wing-attachment-fitting-bolts/analysis","conflicts":"/api/acts/ad-f27-126-wing-attachment-fitting-bolts/conflicts","importantCases":"/api/acts/ad-f27-126-wing-attachment-fitting-bolts/important-cases","documents":"/api/acts/ad-f27-126-wing-attachment-fitting-bolts/documents"}}