{"id":"F2006B03499","name":"AD/BAe 146/48 - Lift Spoiler Jack","slug":"ad-bae-146-48-lift-spoiler-jack","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43053,"registerId":"commonwealth-F2006B03499-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BAe 146/48 - Lift Spoiler Jack","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)  British Aerospace BAe 146 Series Aeroplanes\n\n \n\nAD/BAe 146/48 Lift Spoiler Jack 2/94\n\nApplicability: BAe 146 series aircraft fitted with either lift spoiler jack P/N P308-45-0002 or P308- 45-0102.\n\n \n\nRequirement: Unless previously carried out action in accordance with British Aerospace Mandatory Inspection Service Bulletin 27-137.\n\n \n\nNote: Both UK CAA AD 005-11-92 and FAA AD 93-21-07 amdt 39-8721 refer.\n\n \n\nCompliance: At the next schedule maintenance check of the lift spoilers configuration warning microswitches or by 31 December 1994, whichever occurs first.\n\n \n\nBackground: The manufacturer has advised that the lift spoiler unlocked indication system may suffer from a dormant failure.\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, time-bound safety directive with a narrow, specific scope (particular jack part numbers on one aircraft series). It has not expanded beyond its original purpose of addressing a specific dormant failure in the lift spoiler indication system."},"complexity_factors":["Very short document (approximately 200 words)","Only 2 defined part numbers for applicability","Single requirement referencing an external technical document (Service Bulletin 27-137)","Simple compliance deadline structure (next maintenance check OR fixed date)","No nested exceptions, conditional logic, or cross-references to other legislation","Straightforward background explanation without technical sub-clauses"],"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 British Aerospace BAe 146 aircraft.\n\n**Who it affects:** Owners and operators of BAe 146 series aeroplanes that have specific lift spoiler jack part numbers installed (P/N P308-45-0002 or P308-45-0102).\n\n**What it requires:** Operators must carry out a specific inspection outlined in British Aerospace Mandatory Inspection Service Bulletin 27-137. This inspection addresses a potential hidden fault in the lift spoiler \"unlocked indication system\" — the warning system that tells pilots if the spoilers (flight control surfaces that reduce lift) aren't properly stowed.\n\n**Why it matters:** The manufacturer discovered the warning system could have a \"dormant failure\" — meaning it could fail silently without anyone knowing. If pilots think the spoilers are locked when they're actually not, or vice versa, this creates a serious flight safety risk during takeoff or landing.\n\n**When to comply:** By the next scheduled maintenance check of the lift spoiler configuration warning microswitches, or by 31 December 1994 — whichever comes first.\n\n**International context:** This Australian directive aligns with similar safety notices from the UK Civil Aviation Authority and the US Federal Aviation Administration, showing this was a coordinated international response to a known safety issue."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive applies to a specific subset of BAe 146 aeroplanes and requires a single inspection/action per a manufacturer service bulletin. The instrument’s scope appears aligned with that mechanical objective: it targets aircraft with the listed part numbers and mandates the inspection by a stated maintenance point or date (Applicability; Requirement; Compliance). There is no text in the supplied instrument indicating an expansion or narrowing of that scope beyond the stated applicability and compliance timing."},"complexity_factors":["Narrow applicability limited to BAe 146 aircraft fitted with two specific part numbers (Applicability).","Directive delegates technical procedure to an external manufacturer service bulletin rather than containing technical detail itself (Requirement).","Conditional compliance language: 'unless previously carried out' and 'next scheduled maintenance or by 31 December 1994, whichever occurs first' creates timing conditions to be checked (Requirement; Compliance).","Cross-references to other authorities’ ADs increase traceability checks for operators (Note).","Administrative reliance on operators’ maintenance records to show compliance (implicit in Requirement/Compliance)."],"plain_english_summary":"Operators of BAe 146 aircraft fitted with lift‑spoiler jacks P/N P308‑45‑0002 or P308‑45‑0102 must have the lift‑spoiler “unlocked” indication inspected/serviced per British Aerospace Mandatory Inspection SB 27‑137 by the next scheduled microswitch check or by 31 Dec 1994, unless already done. The AD implements the manufacturer’s fix for a reported dormant failure of the indication system; compliance and costs fall to the aircraft operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-48-lift-spoiler-jack","history":"/api/acts/ad-bae-146-48-lift-spoiler-jack/history","analysis":"/api/acts/ad-bae-146-48-lift-spoiler-jack/analysis","conflicts":"/api/acts/ad-bae-146-48-lift-spoiler-jack/conflicts","importantCases":"/api/acts/ad-bae-146-48-lift-spoiler-jack/important-cases","documents":"/api/acts/ad-bae-146-48-lift-spoiler-jack/documents"}}