{"id":"F2006L03881","name":"AD/TAY/18 - HP Compressor Stator Vane Tip Clearances","slug":"ad-tay-18-hp-compressor-stator-vane-tip-clearances","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":60819,"registerId":"commonwealth-F2006L03881-current","compilationNumber":null,"startDate":"2026-04-02","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/18 | HP Compressor Stator Vane Tip Clearances | 1/2007 |\n| --------- | ---------------------------------------- | ------ |\n\n```html\n

Applicability:

Rolls-Royce Deutschland Ltd & Co. KG and Rolls-Royce plc, Tay 620 / 650 series engine models:

Tay 611-8

Engine Serial Numbers (ESN) prior to 18216; and

Tay 611 -8C

ESN prior to 85055; and

Tay 620-15

All engine serial numbers; and

Tay 650-15

All engine serial numbers; and

Tay 651-54

All engine serial numbers.

Note 1: These engines are installed on, but not limited to, Boeing 727 series, Fokker F28 Mark 0070 and Mark 0100 series, and Gulfstream G-IV and GIV-X series aircraft.

Requirement:

Incorporate revised high pressure (HP) compressor vane setting procedure in accordance with the instructions of Rolls-Royce Deutschland alert service bulletin (ASB) TAY-72-A1653 Revision 1 dated 5 October 2006 or later NAA approved revisions.

Note 2: EASA Airworthiness Directive (AD) number 2006-0336 dated 13 November 2006 refers.

Note 3: This AD supersedes and cancels CASA AD/F100/75 Amendment 1 dated June 2006.

Compliance:

Unless accomplished previously in accordance with AD/F100/75 at any revision status, following compliance schedule applies:

For Tay 611-8 Engines:

- on all engines at the next engine shop visit after the effective date of this directive when the module is disassembled for refurbishment or overhaul.

- if both engines on an aircraft are affected, on at least one engine no later than 5,450 flight hours after the effective date of this directive.

\n```\n\n| | For Tay 611-8C Engines:- on all engines at the next engine shop visit after the effective date of this directive when the module is disassembled for refurbishment or overhaul.- if both engines on an aircraft are affected, on at least one engine no later than 6,800 flight hours since new.For Tay 620-15, Tay 620-15/20, Tay 650-15 and Tay 650-15/10 Engines:- on all engines at the next engine shop visit after the effective date of this directive when the module is disassembled for refurbishment or overhaul, but not later than 1 January 2015.- if both engines on the same aircraft are affected, on at least one engine before 1 January 2011.For Tay 651 -54 Engines:- on all engines at the next shop visit after the effective date of this directive when the module is disassembled for refurbishment or overhaul, but no later than 8,200 flight hours after the effective date of this directive. |\n| ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | This Airworthiness Directive becomes effective on 18 January 2007. |\n| Background: | Some engines have experienced heavy High Pressure (HP) compressor stator vane tip rubs with partial loss of the corresponding HP compressor rotor spacer material on the HP compressor stages 4 to 9. This damage can occur because the minimum vane tip clearance between the HP compressor stator vane tips and the corresponding HP compressor rotor spacers can be potentially too small in adverse operating conditions leading to heavy HP compressor stator vane tip rubs potentially leading to an in-flight shut down (IFSD).This AD introduces a revised HP compressor vane setting procedure to prevent a multiple-engine IFSD. |\n\n| | The AD/F100/75 was applicable to Tay engines installed on Fokker model F100 aircraft only. This AD replaces AD/F100/75 and mandates the requirements on Tay engines irrespective of the aircraft installation. |\n| --- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n23 November 2006","sortOrder":0},{"sectionNumber":"AD/TAY/18","sectionType":"part","heading":"AD/TAY/18","content":"## AD/TAY/18","sortOrder":1},{"sectionNumber":"HP Compressor Stator Vane Tip Clearances","sectionType":"part","heading":"HP Compressor Stator Vane Tip Clearances","content":"## HP Compressor Stator Vane Tip Clearances","sortOrder":2},{"sectionNumber":"1/2007","sectionType":"part","heading":"1/2007","content":"## 1/2007","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"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"The original directive (AD/F100/75) applied only to Tay engines installed on Fokker F100 aircraft. This version expands the scope to cover all aircraft installations using these engine models, including Boeing 727, Gulfstream G-IV, and other Fokker variants. This represents a significant expansion from aircraft-specific to engine-type-wide application."},"complexity_factors":["Multiple engine sub-models with different compliance deadlines (5 distinct variants: Tay 611-8, 611-8C, 620-15, 650-15, 651-54)","Serial number cut-offs for some variants (ESN prior to 18216 for 611-8, prior to 85055 for 611-8C)","Dual-path compliance structure: 'next shop visit' OR specific flight hour limits","Conditional logic for aircraft with 'both engines affected' requiring accelerated compliance on at least one engine","Cross-reference to external technical document (Rolls-Royce ASB TAY-72-A1653 Rev 1) without reproducing its contents","Supersedes previous directive (AD/F100/75) and expands scope from Fokker F100-only to all aircraft installations","Reference to European aviation safety regulation (EASA AD 2006-0336)"],"plain_english_summary":"This CASA Airworthiness Directive mandates a revised compressor‑vane setting procedure (per a Rolls‑Royce service bulletin) for specific Rolls‑Royce Tay 620/650‑series engines to stop compressor blade rub that can lead to in‑flight engine failure. It applies to operators and maintenance organisations of affected engines (e.g., Boeing 727, Fokker F100, Gulfstream G‑IV) and sets model‑specific compliance deadlines.\n\nThe AD expands a prior Fokker‑only order to all aircraft using these engines to reduce the risk of dual‑engine shutdown."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This AD broadens scope compared with the prior AD/F100/75. The source states: 'The AD/F100/75 was applicable to Tay engines installed on Fokker model F100 aircraft only. This AD replaces AD/F100/75 and mandates the requirements on Tay engines irrespective of the aircraft installation.' That change increases the set of operators and aircraft subject to the requirement and supersedes the earlier, aircraft‑limited directive."},"complexity_factors":["Multiple engine models and ESN cut‑offs (Tay 611, 611‑8C, 620‑15, 650‑15, 651‑54) create varied applicability across fleets.","Different compliance triggers and deadlines by model: next shop visit when module disassembled, or specific flight‑hour limits (e.g. 5,450; 6,800; 8,200 FH) and calendar deadlines (by 1 Jan 2011/2015).","Conditional 'if both engines on an aircraft are affected' clauses require at least one engine's compliance within tighter windows, adding scheduling coordination.","Mandates following an external manufacturer Alert Service Bulletin (ASB TAY‑72‑A1653 Rev 1) and references EASA AD 2006‑0336 — enforcible only when NAA/CASA approve later revisions.","Supersedes an earlier AD (AD/F100/75) and expands applicability beyond a single aircraft type, affecting more operators.","Operational compliance tied to shop visit/overhaul events, imposing potential opportunity costs and planning burdens for operators and MROs."],"plain_english_summary":"Requires specified Rolls‑Royce Tay engines to adopt a revised high‑pressure (HP) compressor vane setting procedure (per Rolls‑Royce ASB TAY‑72‑A1653 Rev 1) at the next engine shop visit or within model‑specific flight‑hour/date limits. Affects engine owners, operators and maintainers who must perform the adjustment during overhaul or within the stated hours/dates and bear the maintenance cost and scheduling burden.\n\nThe stated aim is to reduce HP stator vane tip rubs that can damage compressor stages and risk in‑flight shutdowns."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tay-18-hp-compressor-stator-vane-tip-clearances","history":"/api/acts/ad-tay-18-hp-compressor-stator-vane-tip-clearances/history","analysis":"/api/acts/ad-tay-18-hp-compressor-stator-vane-tip-clearances/analysis","conflicts":"/api/acts/ad-tay-18-hp-compressor-stator-vane-tip-clearances/conflicts","importantCases":"/api/acts/ad-tay-18-hp-compressor-stator-vane-tip-clearances/important-cases","documents":"/api/acts/ad-tay-18-hp-compressor-stator-vane-tip-clearances/documents"}}