{"id":"F2006L01677","name":"AD/AL501/6 - FAA Non-Repetitive AD's","slug":"ad-al501-6-faa-non-repetitive-ad-s","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":59411,"registerId":"commonwealth-F2006L01677-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Rolls Royce (Allison) Turbine Engines - ","sectionType":"division","heading":"Rolls Royce (Allison) Turbine Engines - AL501 Series","content":"### Rolls Royce (Allison) Turbine Engines - AL501 Series\n\n| AD/AL501/6 | FAA Non-Repetitive AD's | 7/2006 |\n| ---------- | ----------------------- | ------ |\n\n```html\n

Applicability:

Rolls Royce (formerly ALLISON) AL 501 series engines.

Requirement:

1. Determine the applicability of the AD’s listed in Table 1 of this AD.

2. If it is determined that an applicable AD has not been accomplished, perform the actions required by the AD.

Table 1.

FAA AD Number

FAA Effective Date

Title

59-21-03

Upon Receipt

Compressor Blade Retention Failures

60-21-01

9 November 1960

Torquemeter Housing

79-25-03

13 December 1979

Second Stage Turbine Wheels

86-17-06

15 September 1986

Unwanted Autofeather

Note: Prior to 1963 FAA AD’s did not have effective dates.

Compliance:

Within 30 days after the effective date of this AD.

This Airworthiness Directive becomes effective on 6 July 2006.

Background:

The AD’s listed in Table 1 of this AD have been evaluated and found to require one-time inspections or modifications as at the effective date of this AD. In addition the compliance period for these AD’s has passed. With the introduction of the aeroplane onto the Australian register, the intention of this AD is to ensure compliance with the AD’s listed in Table 1.

\n```\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n24 May 2006","sortOrder":0},{"sectionNumber":"AD/AL501/6","sectionType":"part","heading":"AD/AL501/6","content":"## AD/AL501/6","sortOrder":1},{"sectionNumber":"FAA Non-Repetitive AD's","sectionType":"part","heading":"FAA Non-Repetitive AD's","content":"## FAA Non-Repetitive AD's","sortOrder":2},{"sectionNumber":"7/2006","sectionType":"part","heading":"7/2006","content":"## 7/2006","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":false,"description":"The AD enforces existing FAA ADs for AL501 series engines at the point of Australian registration; it does not broaden the technical subjects of those FAA ADs but requires one‑time confirmation and completion of any outstanding actions within 30 days (Background; Requirement; Compliance)."},"complexity_factors":["Multiple historical FAA ADs listed in Table 1 (dates range from 'Upon Receipt' to 15 September 1986) — requires checking applicability across decades and differing AD formats.","\"Determine the applicability of the AD’s listed in Table 1\" (Requirement 1) — may require technical review of engine/airframe records and expert judgement.","\"If it is determined that an applicable AD has not been accomplished, perform the actions required by the AD\" (Requirement 2) — operators must execute potentially varied inspections or modifications.","Short compliance window: \"Within 30 days after the effective date of this AD\" (Compliance) — compressed timetable for record checks and work.","Pre‑1963 ADs lacked effective dates (Note) — increases record‑search and verification burden for older ADs.","Scope trigger tied to aircraft entry on Australian register (Background) — creates a one‑time compliance obligation on registration rather than ongoing surveillance."],"plain_english_summary":"This directive requires operators of Rolls Royce (Allison) AL501‑series engines to determine whether the FAA airworthiness directives listed in Table 1 have been complied with and, if not, to carry out the inspections or modifications those FAA ADs require. Compliance must be completed within 30 days of this AD’s effective date (6 July 2006). Operators bear the cost and any operational downtime; CASA enforces the requirement when the aeroplane is entered on the Australian register."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope. It was designed specifically to ensure AL501 series engines entering the Australian register complied with historical FAA safety directives, and it does exactly that without expanding into broader operational or maintenance requirements."},"complexity_factors":["Short, single-purpose directive with only 2 operative requirements","No defined terms section — uses plain technical language","Simple conditional logic: check Table 1 → if not done → do it","Single cross-reference mechanism (Table 1 incorporating four external FAA ADs by reference)","No nested exceptions or complex compliance alternatives","Clear, fixed compliance date (30 days after effective date)","Straightforward applicability test (AL501 series engines only)"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of Rolls Royce (Allison) AL501 series turbine engines on the Australian register to confirm whether four specific FAA-mandated safety fixes (compressor blade retention, torquemeter housing, second-stage turbine wheels, and unwanted autofeather) have been carried out. If any are outstanding, the directive mandates the required inspections or modifications within 30 days of 6 July 2006 to address known safety risks."}},"importantCases":[],"_links":{"self":"/api/acts/ad-al501-6-faa-non-repetitive-ad-s","history":"/api/acts/ad-al501-6-faa-non-repetitive-ad-s/history","analysis":"/api/acts/ad-al501-6-faa-non-repetitive-ad-s/analysis","conflicts":"/api/acts/ad-al501-6-faa-non-repetitive-ad-s/conflicts","importantCases":"/api/acts/ad-al501-6-faa-non-repetitive-ad-s/important-cases","documents":"/api/acts/ad-al501-6-faa-non-repetitive-ad-s/documents"}}