{"id":"F2006L00671","name":"AD/JETSTREAM/94 Amdt 2 - Frame 199 Wing Spigot Post Assembly Bolts","slug":"ad-jetstream-94-amdt-2-frame-199-wing-spigot-post-assembly-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":136674,"registerId":"commonwealth-F2006L00671-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"British Aerospace BAe 3100 (Jetstream) S","sectionType":"division","heading":"British Aerospace BAe 3100 (Jetstream) Series Aeroplanes","content":"### British Aerospace BAe 3100 (Jetstream) Series Aeroplanes\n\n| AD/JETSTREAM/94 Amdt 2 | Frame 199 Wing SpigotPost Assembly Bolts | 4/2006 TX |\n| ---------------------- | ---------------------------------------- | --------- |\n\n| Applicability: | All Jetstream Series 3100 and 3200 aircraft.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with BAE Systems Service Bulletin 57-JA020740 Revision 2, or later EASA approved revision.Note: UK CAA AD G-2006-0003 refers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |\n| Compliance:    | Before 31 March 2006, unless already accomplished. Inspect thereafter as specified in the Requirement document.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n|                | This Amendment becomes effective on 6 March 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |\n| Background:    | The manufacturer received reports of failed bolts fitted to frame 199 wing spigot post assembly on in-service aircraft. Investigation revealed fatigue failure, resulting from either incorrect bolts installed or bolt tightening torque being too low. Failure of these bolts severely compromises the structural integrity of the wing to fuselage attachment.Amendment 1 added an alternative bolt part number and a compliance note, and excluded run-down torque in the torque figures.Amendment 2 is issued in response to a new UK CAA AD, which relates to the need by Revision 2 of the Requirement document to check for correct washer installation. Incorrect installation could lead to fretting and fatigue crack initiation in the fitting followed by failure or bending loads in the bolt leading to failure of the affected bolts. If left uncorrected, failure of these bolts or a wing fitting will severely compromise the structural integrity of the wing to fuselage attachment. |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n3 March 2006","sortOrder":0},{"sectionNumber":"AD/JETSTREAM/94 Amdt 2","sectionType":"part","heading":"AD/JETSTREAM/94 Amdt 2","content":"## AD/JETSTREAM/94 Amdt 2","sortOrder":1},{"sectionNumber":"Frame 199 Wing SpigotPost Assembly Bolts","sectionType":"part","heading":"Frame 199 Wing SpigotPost Assembly Bolts","content":"## Frame 199 Wing Spigot  \nPost Assembly Bolts","sortOrder":2},{"sectionNumber":"4/2006 TX","sectionType":"part","heading":"4/2006 TX","content":"## 4/2006 TX","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original scope — addressing structural integrity of wing-to-fuselage attachment bolts on Jetstream aircraft. Amendment 2 adds a specific check for washer installation but does not expand beyond the original safety concern. The amendments have refined and expanded the inspection requirements within the original safety purpose rather than growing into unrelated areas."},"complexity_factors":["Short, single-purpose directive (approximately 300 words of substantive text)","Only 2 defined applicability categories (Series 3100 and 3200)","Single primary requirement referencing an external technical document (Service Bulletin 57-JA020740)","Simple compliance deadline structure (fixed date with ongoing inspection requirement)","Limited conditional logic (only 'unless already accomplished' exception)","No nested definitions or extensive cross-referencing to other legislation","Technical aviation terminology requires domain knowledge but is standard for the industry"],"plain_english_summary":"This AD requires operators of British Aerospace Jetstream 3100/3200 aircraft to inspect and, if necessary, replace the bolts securing the wings at frame 199 and verify correct washer installation and torque per BAE Service Bulletin 57-JA020740 Rev 2.  \n\nIssued by CASA (effective 6 Mar 2006, compliance by 31 Mar 2006) and aligned with the UK CAA, it responds to fatigue failures from incorrect bolts, torque or washers—risking catastrophic wing separation—so recurring inspections must be continued."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The directive's scope was expanded through amendments. Amendment 1 added an alternative bolt part number, a compliance note, and excluded run‑down torque from torque figures. Amendment 2 (this change) responds to a UK CAA AD by adding a requirement to check correct washer installation to prevent fretting and fatigue crack initiation. These amendments increase the procedural checks operators must perform and clarify acceptable parts/torque practices (Background)."},"complexity_factors":["Technical specificity: requires assessment of bolt part numbers, torque values and washer installation to detect fatigue and fretting (Background; Requirement).","Cross-references to external documents and regulators: mandatory compliance via a BAE service bulletin and later EASA‑approved revisions, plus linkage to a UK CAA AD (Requirement; Background).","Time-critical compliance plus ongoing inspections: fixed initial deadline (before 31 March 2006) and continuing inspection regime thereafter (Compliance).","Fleet-wide applicability but narrow scope: applies to all Jetstream 3100 and 3200 aircraft, limiting affected parties but raising uniform maintenance action (Applicability).","Amendment history and evolving technical checks: earlier Amendment 1 changed part‑number options and torque notes; Amendment 2 adds washer installation checks, increasing procedural detail (Background).","Safety-critical consequences concentrate enforcement and liability on operators and maintenance organisations responsible for corrective work (Background; Compliance)."],"plain_english_summary":"This airworthiness directive requires operators of Jetstream 3100/3200 aircraft to inspect and, if necessary, replace or correct frame 199 wing spigot post assembly bolts and washers in line with BAE Systems Service Bulletin 57-JA020740 Revision 2 (or a later EASA‑approved revision). It sets a mandatory compliance date (by 31 March 2006) and ongoing inspection requirements. The rule responds to reports of incorrect parts, low bolt torque or wrong washer installation that can cause fatigue and compromise the wing‑to‑fuselage attachment."},"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-jetstream-94-amdt-2-frame-199-wing-spigot-post-assembly-bolts","history":"/api/acts/ad-jetstream-94-amdt-2-frame-199-wing-spigot-post-assembly-bolts/history","analysis":"/api/acts/ad-jetstream-94-amdt-2-frame-199-wing-spigot-post-assembly-bolts/analysis","conflicts":"/api/acts/ad-jetstream-94-amdt-2-frame-199-wing-spigot-post-assembly-bolts/conflicts","importantCases":"/api/acts/ad-jetstream-94-amdt-2-frame-199-wing-spigot-post-assembly-bolts/important-cases","documents":"/api/acts/ad-jetstream-94-amdt-2-frame-199-wing-spigot-post-assembly-bolts/documents"}}