{"id":"F2005L01784","name":"AD/TAY/8 Amdt 2 - Engine LP Fuel Tube","slug":"ad-tay-8-amdt-2-engine-lp-fuel-tube","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":35939,"registerId":"commonwealth-F2005L01784-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Rolls Royce Turbine Engines - Tay Series","sectionType":"division","heading":"Rolls Royce Turbine Engines - Tay Series","content":"### Rolls Royce Turbine Engines - Tay Series\n\n| AD/TAY/8 Amdt 2 | Engine LP Fuel Tube | 8/2005 |\n| --------------- | ------------------- | ------ |\n\n| Applicability: | Rolls Royce TAY 611-8, 620-15, 650-15 and 651-54 series engines. |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. Unless the relevant maintenance records certify that compliance in accordance with cancelled AD/F100/57, AD/TAY/8 or AD/TAY/8 Amdt 1, German LBA AD 2002-331 or 2002-358/2 or the Service Bulletin(s) referenced in the LBA AD’s has been carried out, inspect low pressure fuel tube, P/N JR33021, for fretting in accordance with the Accomplishment Instructions of Rolls Royce Service Bulletins TAY-73-1553R3 dated 31 May 2005 or TAY-73-1593R1 dated 31 May 2005.2. Repeat Requirement 1.3. Inspect low pressure fuel tube, P/N JR26955 in accordance with Rolls Royce SB TAY-73-1669 dated 31 May 2005.4. Repeat Requirement 2.5. Replace low pressure fuel tube, P/N JR33021 and P/N JR26955, with new improved low pressure tube P/N JR58112 in accordance with the Accomplishment Instructions in Rolls Royce Service Bulletins TAY-73-1592R1 dated 31 May 2005.Terminating ActionReplacement of low pressure fuel tube, P/N JR33021 and JR26955, with new improved low pressure tube P/N JR58112 in accordance with the Accomplishment Instructions in Rolls Royce Service Bulletins TAY-73-1592R1 dated 30 April 2003, terminates any further repeat inspections required by the Directive.Note: LBA AD D-2002-358/6 (as approved by EASA approval number 2005-4734 dated 31 May 2005) refers. |\n| Compliance: | For TAY 620-15 and 650-15 series engines:For Requirement 1: Prior to further flight after the effective date of this Directive. |\n\n| | For Requirement 2: At intervals not to exceed 1000 hours time-in-service (TIS) since last carrying out the inspection required by Requirement 1.For Requirement 3: Within 1000 flight hours after the effective date of this Directive.For Requirement 4: At intervals not to exceed 1000 TIS since last carrying out the inspection required by Requirement 3.For Requirement 5: By 30 December 2005, except for engines with less than 4000 hours time-since-new (TSN) on 30 December 2005 when replacement must be carried out before reaching 4000 hours TSN.For TAY 611-8 and 651-54 series engines:For Requirement 1: For engines with less than 4000 hours TSN the initial inspection must be carried out before reaching 4000 hours TSN after the effective date of this Directive. For engines with more than 4000 hours TSN the initial inspection must be accomplished before further flight.For Requirement 2: At intervals not to exceed 1000 hours TIS since last carrying out the inspection required by Requirement 1.For Requirement 3: Within 1000 flight hours after the effective date of this Directive.For Requirement 4: At intervals not to exceed 1000 TIS since last carrying out the inspection required by Requirement 3.For Requirement 5: By 30 December 2005, except for engines with less than 4000 hours TSN on 30 December 2005 when replacement must be carried out before reaching 4000 hours TSN. |\n| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | This Amendment becomes effective on 4 August 2005. |\n| Background: | In-service experience of the worldwide TAY 650 fleet has shown the possibility of fuel leakage from the engine low pressure fuel tube connected to the fuel flowmeter and high pressure pump. Originally, AD/F100/57 was raised following a partial disconnect of the fuel tube causing a massive fuel leak which resulted in an in-flight double engine flame-out due to fuel starvation. This Directive cancelled AD/F100/57 and raised a new Directive extending applicability to other RR TAY model/series engines.This amendment now includes inspection requirements for low pressure fuel tube P/N JR26955, reduces the repetitive inspection interval from 2000 to 1000 hours, and increases the period for replacement of the tubes from 30 June 2005 to 31 December 2005. |\n\n| | Amendment 1 of this Directive included an additional fuel tube that is required to be replaced. The compliance times did not change for both the inspection and replacement of the tubes.Amendment 1 of this Directive became effective 8 July 2004.The original issue of this Airworthiness Directive became effective on 16 July 2003. |\n| --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n24 June 2005","sortOrder":0},{"sectionNumber":"AD/TAY/8 Amdt 2","sectionType":"part","heading":"AD/TAY/8 Amdt 2","content":"## AD/TAY/8 Amdt 2","sortOrder":1},{"sectionNumber":"Engine LP Fuel Tube","sectionType":"part","heading":"Engine LP Fuel Tube","content":"## Engine LP Fuel Tube","sortOrder":2},{"sectionNumber":"8/2005","sectionType":"part","heading":"8/2005","content":"## 8/2005","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"This amendment expands and tightens the original Directive: it adds low‑pressure fuel tube P/N JR26955 to the inspection/replacement requirements, reduces the repetitive inspection interval from 2000 to 1000 hours, and extends the replacement deadline from 30 June 2005 to 31 December 2005 (Background; Requirement summary). Amendment 1 earlier added another tube for replacement but kept prior compliance timings (Background)."},"complexity_factors":["Multiple engine models covered with different timing rules: TAY 611-8, 620-15, 650-15 and 651-54 (Applicability).","Multiple part numbers and actions: inspect P/N JR33021 and JR26955; replace both with P/N JR58112 as terminating action (Requirement 1–5; Terminating Action).","Staggered compliance windows and thresholds by model and hours: initial-inspection-before-further-flight or before 4000 hours TSN, 1000-hour repeat intervals, and a replacement deadline (Compliance: Requirements 1–5).","Cross-references to external documents and approvals: Rolls Royce Service Bulletins and German LBA/EASA ADs are normative for how work is done (Requirement text; Note).","Operational burden on operators: mandatory inspections at short intervals and a fleet-wide replacement deadline impose direct maintenance costs and downtime (Compliance; Requirement 2–5).","Implementation detail dependence: terminating the inspection requirement requires specific accomplishment instructions in Rolls Royce SB TAY-73-1592R1 (Terminating Action).","Evolutionary amendments: this amendment adds P/N JR26955 and shortens intervals (Background), requiring operators to track variant changes and historical compliance (Amendment notes).","Risk-management trade-offs: shortening the inspection interval from 2000 to 1000 hours increases inspection frequency (Background), shifting costs forward to reduce time-to-detection of fretting."],"plain_english_summary":"Mandates inspection and replacement of specific low‑pressure fuel tubes (P/N JR33021 and JR26955) on Rolls‑Royce TAY series engines; replacing them with improved tube P/N JR58112 terminates the inspection requirement. Affects operators of TAY 611‑8, 620‑15, 650‑15 and 651‑54 engines and sets model‑dependent deadlines, repeat inspection intervals and TSN thresholds to detect fretting and prevent fuel leakage that previously caused in‑flight flame‑outs."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"The original directive (July 2003) addressed only one fuel tube type following a specific incident. Amendment 1 (July 2004) added a second tube type. This Amendment 2 (August 2005) further expands scope by: (1) adding inspection requirements for a third tube variant (P/N JR26955), (2) tightening inspection intervals from 2,000 to 1,000 hours, and (3) extending replacement deadlines. The directive has evolved from a targeted emergency response to a comprehensive fleet-wide safety management program covering multiple tube configurations with graduated compliance schedules."},"complexity_factors":["Multiple part numbers referenced (JR33021, JR26955, JR58112) with different requirements for each","Bifurcated compliance schedule — different deadlines for different engine models (620-15/650-15 vs 611-8/651-54)","Nested time calculations: 'time-in-service' (TIS) vs 'time-since-new' (TSN) with conditional thresholds (4,000 hours)","Cross-references to cancelled directives (AD/F100/57, AD/TAY/8, AD/TAY/8 Amdt 1), German LBA ADs, and multiple Rolls Royce Service Bulletins","Terminating action clause that references a different dated version of the same Service Bulletin (30 April 2003 vs 31 May 2005)","Exception-within-exception structure for replacement deadlines (30 December 2005 deadline, except for engines under 4,000 hours TSN)"],"plain_english_summary":"This CASA Airworthiness Directive mandates more frequent inspections and an upgrade for certain Rolls‑Royce TAY 611‑8/620‑15/650‑15/651‑54 engines used on Fokker regional jets. It responds to fretting of low‑pressure fuel tubes that can leak or disconnect — an event that previously caused massive fuel loss and a double engine flame‑out.\n\nAffected operators must inspect specified fuel tubes every 1,000 flight hours and replace older tubes with the improved part by the specified compliance date to prevent catastrophic fuel failure."},"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-tay-8-amdt-2-engine-lp-fuel-tube","history":"/api/acts/ad-tay-8-amdt-2-engine-lp-fuel-tube/history","analysis":"/api/acts/ad-tay-8-amdt-2-engine-lp-fuel-tube/analysis","conflicts":"/api/acts/ad-tay-8-amdt-2-engine-lp-fuel-tube/conflicts","importantCases":"/api/acts/ad-tay-8-amdt-2-engine-lp-fuel-tube/important-cases","documents":"/api/acts/ad-tay-8-amdt-2-engine-lp-fuel-tube/documents"}}