{"id":"F2006B09694","name":"AD/F27/127 - Fuselage Bracket Attachment Fasteners","slug":"ad-f27-127-fuselage-bracket-attachment-fasteners","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115850,"registerId":"commonwealth-F2006B09694-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F27/127 - Fuselage Bracket Attachment Fasteners","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/F27/127 Fuselage Bracket Attachment Fasteners 12/91\n\nApplicability: Model F27 S/No’s 10102 thru 10433, 10435 thru 10443, & 10446 thru 10450. Requirement:               Action in accordance with the Technical Requirements of RLD AD 91-112.\n\nNote: Fokker SB F27/57-23 Revision 6 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: Reports of loose bolts and hi-shear pins in the brackets on the front and rear spars. The effective date required by the RLD is extended by approximately two 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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The directive modifies the timing of when the referenced technical requirements apply to Australian-registered aircraft by revising the effective date to 12 December 1991 and states that this extends the RLD effective date by approximately two months for Australian aircraft (Compliance; Background). The applicability (the listed F27 serial numbers) and the substantive requirement (to follow RLD AD 91-112 and refer to Fokker SB F27/57-23 Revision 6) remain as in the referenced material; the change is limited to the effective date for Australian-registered aircraft."},"complexity_factors":["Cross-references to external technical documents (RLD AD 91-112 and Fokker SB F27/57-23 Rev 6) rather than including procedure text in the AD (Requirement; Note).","Applicability limited to a specific list of serial numbers, requiring operators to check serial-number status (Applicability).","Revised effective date for a subset of aircraft (Australian-registered), introducing a timing variation from the referenced RLD (Compliance; Background).","Technical subject matter (fasteners on front and rear spars) implies specialized maintenance actions that are not detailed in the AD itself (Background; Requirement)."],"plain_english_summary":"This airworthiness directive requires owners/operators of the listed Fokker F27 serial numbers to comply with the Technical Requirements of RLD AD 91‑112 (related to fuselage bracket attachment fasteners) after reports of loose bolts and hi‑shear pins.  \n\nThe Civil Aviation Safety Authority issues the AD, sets a revised compliance date of 12 December 1991 for Australian‑registered aircraft, and compliance costs and implementation fall to the aircraft owners/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 defined aircraft population. It has not expanded beyond its original purpose of ensuring fastener integrity in Fokker F27 fuselage brackets."},"complexity_factors":["Very short document (approximately 150 words)","Only 1 defined applicability range (specific serial numbers)","Single technical requirement referencing an external document (RLD AD 91-112)","No nested conditional logic or exceptions","No cross-references to other legislation beyond the note about Fokker Service Bulletin F27/57-23","Straightforward compliance deadline with simple extension"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it like a compulsory recall notice, but for aircraft instead of cars.\n\n**What it does:** It requires owners and operators of specific Fokker F27 aircraft to inspect and fix a problem with **fuselage bracket attachment fasteners** — essentially, the bolts and pins that hold critical structural brackets to the front and rear spars (the main structural beams of the wing). The directive mandates that Australian operators follow the technical instructions from a Dutch aviation authority document (RLD AD 91-112), with a specific Australian compliance deadline of **12 December 1991**.\n\n**Who it affects:** Owners and operators of Fokker F27 aircraft with serial numbers 10102 through 10433, 10435 through 10443, and 10446 through 10450.\n\n**Why it matters:** Loose bolts and \"hi-shear pins\" in these brackets could compromise the structural integrity of the aircraft. This directive prevents potential in-flight structural failures by ensuring these fasteners are properly secured. The Australian deadline was extended by about two months from the original Dutch requirement to give local operators reasonable time to comply."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f27-127-fuselage-bracket-attachment-fasteners","history":"/api/acts/ad-f27-127-fuselage-bracket-attachment-fasteners/history","analysis":"/api/acts/ad-f27-127-fuselage-bracket-attachment-fasteners/analysis","conflicts":"/api/acts/ad-f27-127-fuselage-bracket-attachment-fasteners/conflicts","importantCases":"/api/acts/ad-f27-127-fuselage-bracket-attachment-fasteners/important-cases","documents":"/api/acts/ad-f27-127-fuselage-bracket-attachment-fasteners/documents"}}