{"id":"F2006L02235","name":"AD/BAe 146/121 - Lift Spoiler Actuator Life Limits","slug":"ad-bae-146-121-lift-spoiler-actuator-life-limits","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":117561,"registerId":"commonwealth-F2006L02235-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"British Aerospace BAe 146 Series Aeropla","sectionType":"division","heading":"British Aerospace BAe 146 Series Aeroplanes","content":"### British Aerospace BAe 146 Series Aeroplanes\n\n| AD/BAe 146/121 | Lift Spoiler Actuator Life Limits | 8/2006 |\n| -------------- | --------------------------------- | ------ |\n\n| Applicability: | BAe 146 and AVRO 146-RJ aeroplanes.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Determine the life of each lift spoiler actuator/jack, part number P308-45-0002, P308-45-0102 or P308-45-0202, in accordance with Paragraph 1.D of Service Bulletin 27-178 Revision 0 or later approved revision.2. Replace each lift spoiler actuator/jack part number P308-45-0002, P308-45-0102 or P308-45-0202, in accordance with Paragraph 2.A of Service Bulletin 27-178 Revision 0 or later approved revision.Note: EASA AD 2006-0138 dated 23 May 2006 refers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n| Compliance:    | 1. Within 30 days after the effective date of this AD.2. Prior to the part accumulating 55,000 flight cycles or before 1 September 2007, whichever occurs later after the effective date of this AD.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n|                | This Airworthiness Directive becomes effective on 3 August 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n| Background:    | The life limitation relating to the P308-45 series of lift spoiler jacks was originally qualified to 55000 flight cycles and there is no new data to support an increase to this figure.The aircraft life is currently defined in Chapter 5 of the aircraft Maintenance Manual as 40,000, 43,000 or 50,000 cycles depending on variant. The life limit of the lift spoiler jack is not defined as this is in excess of the stated aircraft life.The lift spoiler jack life limitation has been reviewed as part of the BAe 146 and AVRO RJ aircraft (systems) Life Extension Programme. The lift spoiler actuator is highly loaded at high flap angles with the aircraft operating near to the maximum permitted speed for that flap angle. The most likely flight phase for this failure to occur is therefore approach or take-off. The low altitude of these flight phases provides less time in which to safely control the increased roll rate. Therefore the unit life must remain at 55,000 cycles. |\n\n|     | A number of aircraft are approaching the applicable life limitation. Also, where accurate records are not available for individual units, the calculated theoretical life may exceed 55,000 cycles. This has been determined as acceptable for the limited period defined within the AD compliance requirement. |\n| --- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n20 June 2006","sortOrder":0},{"sectionNumber":"AD/BAe 146/121","sectionType":"part","heading":"AD/BAe 146/121","content":"## AD/BAe 146/121","sortOrder":1},{"sectionNumber":"Lift Spoiler Actuator Life Limits","sectionType":"part","heading":"Lift Spoiler Actuator Life Limits","content":"## Lift Spoiler Actuator Life Limits","sortOrder":2},{"sectionNumber":"8/2006","sectionType":"part","heading":"8/2006","content":"## 8/2006","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — it addresses a specific safety-critical component on specific aircraft models with a clear life limit. There is no evidence of scope creep; the directive precisely targets the lift spoiler actuator issue identified in the background without expanding into unrelated systems or aircraft types."},"complexity_factors":["Single, specific technical requirement with clear part numbers (P308-45-0002, P308-45-0102, P308-45-0202)","Only two compliance deadlines with straightforward 'whichever is later' logic","References only one external technical document (Service Bulletin 27-178)","No nested exceptions or conditional sub-clauses","Narrow applicability (two specific aircraft models only)","Total length is approximately 300 words"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires operators of BAe 146 and AVRO 146‑RJ aircraft in Australia to verify and replace lift‑spoiler actuators before they reach 55,000 flight cycles to prevent low‑altitude roll control failures.  \n\nOperators must check actuator cycle counts promptly (within 30 days) and ensure replacement by the 55,000‑cycle limit (or by 1 September 2007), as applicable."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The AD explicitly imposes a 55,000 flight‑cycle life limit and mandatory replacement schedule for the P308‑45 series lift‑spoiler actuators, whereas the actuator life was previously not defined in the aircraft Maintenance Manual and aircraft life varied by variant. The directive therefore expands regulatory scope by defining and enforcing a component‑level life limit independent of the aircraft’s stated life (Background; Requirement; Compliance)."},"complexity_factors":["Narrow technical scope: applies only to three specific part numbers of lift‑spoiler actuators (Requirement / Applicability).","Two overlapping deadlines: initial administrative action within 30 days and mandatory replacement before 55,000 cycles or by a calendar date (Compliance).","Dependency on an external document: calls for actions ‘in accordance with’ BAe Service Bulletin 27‑178 Revision 0 or later, requiring operators to obtain and follow that SB (Requirement).","Record‑keeping accuracy: enforcement depends on accurate flight‑cycle counting per individual actuator; the AD notes some units lack precise records (Background).","Interaction with aircraft life definitions: aircraft life varies by variant (40k/43k/50k cycles) while the actuator life is set at 55k, creating a mismatch operators must manage (Background).","Logistical and operational burden: mandatory part replacement entails procurement, maintenance hours and aircraft downtime not quantified in the AD (Requirement / Compliance).","Regulatory cross‑reference: refers to EASA AD 2006‑0138 for context, increasing cross‑jurisdictional compliance monitoring (Requirement note).","Risk timing: the background ties likely failure phase to approach/take‑off, implying urgency and operational safety implications that drive compliance priority (Background)."],"plain_english_summary":"This Airworthiness Directive requires operators of BAe 146 and AVRO 146‑RJ aeroplanes to record the service life of specific lift‑spoiler actuators (P308‑45‑0002 / P308‑45‑0102 / P308‑45‑0202) in line with BAe Service Bulletin 27‑178 and to replace each unit before it reaches 55,000 flight cycles (or by 1 September 2007), with initial compliance within 30 days. The AD enforces a component life limit that the background states was already qualified to 55,000 cycles because of failure risk during high‑speed flap operations."},"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-bae-146-121-lift-spoiler-actuator-life-limits","history":"/api/acts/ad-bae-146-121-lift-spoiler-actuator-life-limits/history","analysis":"/api/acts/ad-bae-146-121-lift-spoiler-actuator-life-limits/analysis","conflicts":"/api/acts/ad-bae-146-121-lift-spoiler-actuator-life-limits/conflicts","importantCases":"/api/acts/ad-bae-146-121-lift-spoiler-actuator-life-limits/important-cases","documents":"/api/acts/ad-bae-146-121-lift-spoiler-actuator-life-limits/documents"}}