{"id":"F2007L00750","name":"AD/BAe 146/54 Amdt 1 - Elevator Drain Holes","slug":"ad-bae-146-54-amdt-1-elevator-drain-holes","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":64435,"registerId":"commonwealth-F2007L00750-current","compilationNumber":null,"startDate":"2026-04-02","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 146/54 Amdt 1 | Elevator Drain Holes | 4/2007 |\n| -------------------- | -------------------- | ------ |\n\n| Applicability: | Model BAe 146 and AVRO 146-RJ series aircraft, all serial numbers, unless previously modified in accordance with HCM01490A or HCM01490B or HCM0149C.                                                                                                                                                                                                                                                                                                                                    |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the requirements of EASA AD 2007-0058.Note: BAE Systems (Operations) Ltd Service Bulletin 55-013-01490B Revision 3 refers.                                                                                                                                                                                                                                                                                                                                    |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of12 April 2007.                                                                                                                                                                                                                                                                                                                                                                                                |\n|                | This Amendment becomes effective on 12 April 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n| Background:    | Reports were received of water accumulation in the elevators following steep climbs. Un-drained accumulated water could upset the balance of the elevator.Amendment 1 is issued in response to a new EASA AD, which retains the requirements of the previous issues of the related service bulletin, and additionally, requires confirmation that accomplishment of the elevator drain hole modification is acceptable in accordance with Revision 3 of Service Bulletin 55-013-01490B. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n2 March 2007","sortOrder":0},{"sectionNumber":"AD/BAe 146/54 Amdt 1","sectionType":"part","heading":"AD/BAe 146/54 Amdt 1","content":"## AD/BAe 146/54 Amdt 1","sortOrder":1},{"sectionNumber":"Elevator Drain Holes","sectionType":"part","heading":"Elevator Drain Holes","content":"## Elevator Drain Holes","sortOrder":2},{"sectionNumber":"4/2007","sectionType":"part","heading":"4/2007","content":"## 4/2007","sortOrder":3}],"analysis":{"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 retains the previous service-bulletin requirements and adds an explicit requirement to confirm that the elevator drain‑hole modification is acceptable in accordance with BAE Systems Service Bulletin 55-013-01490B Revision 3. The amendment therefore narrows the technical acceptance standard (requires Rev 3 confirmation) while keeping the original corrective intent (Background; Requirement)."},"complexity_factors":["Cross-reference to an external regulator's directive (EASA AD 2007-0058) creates dependency on another instrument for the exact technical and compliance steps (Requirement).","Mandate refers to a specific manufacturer service bulletin and its Revision 3, requiring operators to use the latest revision and seek confirmation that work meets that revision (Requirement; Background).","Applicability excludes aircraft already modified in accordance with three specific modification references (HCM01490A, HCM01490B, HCM0149C), so operators must check modification history per-aircraft (Applicability).","Fixed effective/compliance date (12 April 2007) imposes a time-bound obligation on operators to schedule work and record compliance (Compliance).","Technical work is carried out under a service bulletin; this creates a compliance and maintenance-burden on operators and maintenance organisations to follow and document those procedures (Requirement).","Regulatory acceptance/confirmation of the Revision 3 modification is required, which may involve administrative submission and regulator or delegated acceptance (Background; Requirement).","Limited scope: affects a defined fleet rather than broad classes, which concentrates compliance costs on that operator group (Applicability).","Delegation and enforcement are exercised by the Civil Aviation Safety Authority (signature by delegate), implying administrative discretion in implementation and oversight (document header/signature)."],"plain_english_summary":"This airworthiness directive requires BAe 146 and Avro 146‑RJ operators (all serial numbers, unless already modified) to install or confirm an elevator drain‑hole modification to prevent water collecting in the elevators and upsetting control balance. Operators must follow EASA AD 2007‑0058 and the referenced BAE Systems Service Bulletin (55‑013‑01490B Rev 3) and comply by the stated effective date (12 April 2007)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, technical safety directive focused specifically on elevator drain holes for one aircraft family. The amendment simply updates the reference to a revised service bulletin (Revision 3) and aligns with a new EASA directive, without expanding beyond the original safety purpose of preventing water accumulation in control surfaces."},"complexity_factors":["Very short document (under 300 words)","Only 3 defined technical references (HCM01490A/B/C, EASA AD 2007-0058, Service Bulletin 55-013-01490B)","Single requirement with straightforward applicability test (serial numbers + modification history check)","No nested conditional logic or exceptions beyond the initial exemption clause","Cross-references only to external technical documents, not to other legislation"],"plain_english_summary":"This AD mandates BAe 146 / AVRO 146‑RJ operators to modify or confirm elevator drain holes to prevent water pooling that can unbalance the elevator and threaten pitch control. Compliance follows EASA AD 2007‑0058 using Service Bulletin 55‑013‑01490B Rev 3; aircraft already modified under earlier SB revisions are exempt. Issued by CASA, effective 12 April 2007."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-54-amdt-1-elevator-drain-holes","history":"/api/acts/ad-bae-146-54-amdt-1-elevator-drain-holes/history","analysis":"/api/acts/ad-bae-146-54-amdt-1-elevator-drain-holes/analysis","conflicts":"/api/acts/ad-bae-146-54-amdt-1-elevator-drain-holes/conflicts","importantCases":"/api/acts/ad-bae-146-54-amdt-1-elevator-drain-holes/important-cases","documents":"/api/acts/ad-bae-146-54-amdt-1-elevator-drain-holes/documents"}}