{"id":"F2005L00590","name":"AD/CF34/8 Amdt 1 - B Sump Screen","slug":"ad-cf34-8-amdt-1-b-sump-screen","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":112838,"registerId":"commonwealth-F2005L00590-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"General Electric Turbine Engines - CF34 ","sectionType":"division","heading":"General Electric Turbine Engines - CF34 Series","content":"### General Electric Turbine Engines - CF34 Series\n\n| AD/CF34/8 Amdt 1 | B Sump Screen | 4/2005 |\n| ---------------- | ------------- | ------ |\n\n| Applicability: | General Electric Company (GE) CF34-3Al, -3B and -3B1 turbofan engines with scavenge screens part numbers (P/Ns) 4047T95P01 and 5054T86G02 installed in the B-sump oil scavenge system.Note 1: These engines are installed on, but not limited to, Bombardier Inc. (Canadair) Model CL-600-2A12, CL-600-2B16 and CL-600-2B19 aeroplanes. |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. Initial Inspection and Cleaning of B-Sump ScreensPerform an initial visual inspection and cleaning of scavenge screens, P/Ns 4047T95P01 and 5054T86G02, installed in the B-sump oil scavenge system, in accordance with Paragraphs 3A through 3B of the Accomplishment Instructions of General Electric Aircraft Engines (GE) Alert Service Bulletin (ASB) CF34-AL S/B 79-A0014, Revision 3, dated 31 January 2003; or ASB CF34-BJ S/B 79- A00l5, Revision 3, dated 31 January 2003.2. Repetitive Inspections and CleaningPerform repetitive visual inspections and cleaning of scavenge screens, P/Ns 4047T95P01 and 5054T86G02, installed in the B-sump oil scavenge system, in accordance with Paragraphs 3A through 3B of the Accomplishment instructions of GE ASB CF34-AL S/B 79-A00 14, Revision 3; and ASB CF34-BJ S/B 79-A00l5, Revision 3.3. Terminating ActionsInstall new screenless fittings or fittings that have been reworked to remove the screens, in the B-sump oil scavenge system, in accordance with GE ASB CF34-AL S/B 79-A00l6, dated 17 June 2002; or ASB CF34-BJ S/B 79-A0017, dated 17 June 2002.Completion of Requirement 3 of this Directive provides terminating action to this Directive.Note 2: FAA AD 2003-05-10R1 Amdt 39-13337 refers. |\n\n```html\n

Compliance:

1. Initial Inspection and Cleaning Schedule.

Engine hours time-since-new (TSN) or time-since-last-shop-visit (TSLSV)

Inspect and clean

(1) Fewer than 4,000 hours TSN or fewer than 4,000 hours TSLSV if it can be confirmed that both the B-sump scavenge screens were cleaned and the B-sump and combustor frame (strut tubes) were removed from the engine and cleaned at that prior shop visit.

Before 4,000 hours TSN or TSLSV.

(2) Fewer than 1,000 hours TSLSV if it can NOT be confirmed that both the B sump scavenge screens were cleaned and the B-sump and combustor frame (strut tubes) were removed from the engine and cleaned at that prior shop visit.

Before 1,000 hours TSLSV.

(3) 4,000 hours or greater TSN or 4,000 hours or greater TSLSV if it can be confirmed that both the B-sump scavenge screens were cleaned and the B sump and combustor frame (strut tubes) were removed from the engine and cleaned at that prior shop visit, or 1,000 hours or greater TSLSV if it can NOT be confirmed that both the B-sump and combustor frame (strut tubes) were removed from the engine and cleaned at that prior shop visit.

Within 500 hours time-in-service (TIS) after the effective date of this Directive.

2. Repetitive Inspections and Cleaning.

(a) At intervals not to exceed 200 hours time-since-last-inspection (TSLI), if no coke is found in screens during initial or any prior inspections, or

(b) At intervals not to exceed 100 hours TSLI, if coke is found in screens during initial or any prior inspections.

3. Terminating Actions.

Unless previously accomplished:

(a) For engines with more than 4,000 hours TSN, within 500 hours TIS after the effective date of this AD, or within 1,000 hours TSLSV, whichever occurs first.

(b) For engines with less than or equal to 4,000 hours TSN, prior to 4,500 hours TSN. This constitutes terminating action to the inspections required in paragraph 2 of this AD.

\n```\n\n| | This Amendment becomes effective on 14 April 2005. |\n| ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Background: | This Directive was issued requiring the inspection and cleaning of the B-sump oil scavenge screen. The requirement is in response to five in-flight shut down events resulting from the loss of B-sump oil scavenging. In two of the events, there was turbine stage separation and in two of the other events, there was separation of the fan drive shaft.This amendment includes terminating action to the initial and repetitive inspections detailed.The original issue of this Directive became effective 16 May 2002. |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n3 March 2005","sortOrder":0},{"sectionNumber":"AD/CF34/8 Amdt 1","sectionType":"part","heading":"AD/CF34/8 Amdt 1","content":"## AD/CF34/8 Amdt 1","sortOrder":1},{"sectionNumber":"B Sump Screen","sectionType":"part","heading":"B Sump Screen","content":"## B Sump Screen","sortOrder":2},{"sectionNumber":"4/2005","sectionType":"part","heading":"4/2005","content":"## 4/2005","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"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"The original 2002 directive only required ongoing inspections and cleaning. This 2005 amendment significantly expanded the scope by adding 'terminating actions' — a permanent hardware modification that eliminates the need for repetitive inspections. This transformed the directive from an open-ended maintenance burden into a time-limited compliance pathway with a defined endpoint."},"complexity_factors":["Multiple cross-references to external technical documents (GE Alert Service Bulletins CF34-AL S/B 79-A0014, 79-A0015, 79-A0016, 79-A0017)","Conditional compliance schedule based on three different engine hour thresholds (TSN/TSLSV) and maintenance history confirmation","Nested conditional logic for repetitive inspection intervals (200 hours vs 100 hours depending on coke findings)","Dual terminating action deadlines depending on engine hours (500 hours TIS vs 1,000 hours TSLSV vs 4,500 hours TSN)","Technical aviation terminology requiring specialised knowledge (B-sump, scavenge screens, TSN, TSLSV, TIS, TSLI, coke deposits)","Reference to corresponding FAA AD (2003-05-10R1) indicating harmonised international regulatory framework"],"plain_english_summary":"CASA has issued an Airworthiness Directive for GE CF34-3A1/-3B/-3B1 engines on certain Bombardier CL-600 series aircraft requiring inspection and cleaning of B‑sump oil scavenge screens because carbon (“coke”) buildup has caused multiple in‑flight engine shutdowns and component failures. \n\nOperators and maintenance organisations must perform initial and repetitive inspections (with increased frequency if deposits are found) and ultimately install screenless or modified fittings as the terminating safety action."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"This amendment adds a clear terminating action to the original directive: installing screenless or reworked fittings per specified GE ASBs (Requirement 3). The original directive required inspection and cleaning; the amendment preserves those inspections (Requirement 1–2) but makes installation of the fittings a compliance pathway and sets deadlines for that terminating action (Compliance: Terminating Actions)."},"complexity_factors":["Multiple conditional timing rules based on engine hours TSN and time‑since‑last‑shop‑visit (TSLSV) with different triggers for initial inspection (Compliance table: items (1)–(3)).","Two-tier repetitive inspection intervals depending on whether 'coke' is found (200 hours TSLI if clean; 100 hours TSLI if contaminated) (Compliance: paragraph 2(a)–(b)).","Termination path requires installation of new screenless or reworked fittings in accordance with specific GE Alert Service Bulletins (ASBs) (Requirement: paragraph 3; ASBs cited).","Dependence on confirmation of prior shop work to determine inspection timing creates record‑verification burden (Compliance table: references to confirmation that screens and B‑sump/combustor frame were removed and cleaned).","Cross‑references to multiple GE ASBs (different part numbers and revisions) and to FAA AD create procedural complexity for maintenance planning and approvals (Requirement and Note 2).","Hard compliance deadlines for terminating action (within 500 hours TIS after effective date or prior to 4,500 TSN, and alternative TSLSV limits) produce operational scheduling constraints (Compliance: Terminating Actions (a)–(b)).","Costs and downtime for operators and MROs from recurring inspections, cleaning, possible part replacement or rework, and shop visits (implied by Requirement 1–3 and Compliance timing).","Risk of inconsistent implementation if records are incomplete or if ASB revisions differ from those cited (Requirement cites specific ASB revisions/dates)."],"plain_english_summary":"This directive requires operators of General Electric CF34-3A/3B/3B1 engines to inspect and clean B‑sump oil scavenge screens on a schedule tied to engine hours and prior shop work, with repeat inspections every 100–200 hours depending on contamination. It provides a terminating option: install screenless or reworked fittings per specified GE service bulletins to end the inspection cycle. It affects aircraft operators and maintenance organisations, who bear inspection, cleaning, parts and downtime costs after several in‑flight shutdowns linked to scavenge loss."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cf34-8-amdt-1-b-sump-screen","history":"/api/acts/ad-cf34-8-amdt-1-b-sump-screen/history","analysis":"/api/acts/ad-cf34-8-amdt-1-b-sump-screen/analysis","conflicts":"/api/acts/ad-cf34-8-amdt-1-b-sump-screen/conflicts","importantCases":"/api/acts/ad-cf34-8-amdt-1-b-sump-screen/important-cases","documents":"/api/acts/ad-cf34-8-amdt-1-b-sump-screen/documents"}}