{"id":"F2006B10971","name":"AD/JT15D/9 - Borescope Inspection of Impeller Rear Face","slug":"ad-jt15d-9-borescope-inspection-of-impeller-rear-face","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56549,"registerId":"commonwealth-F2006B10971-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png) \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png) \n\nPratt and Whitney Canada Turbine Engines \\- JT15D Series","sortOrder":0},{"sectionNumber":"AD/JT15D/9 Borescope Inspection of Impel","sectionType":"part","heading":"AD/JT15D/9 Borescope Inspection of Impeller Rear Face 10/2003","content":"# AD/JT15D/9 Borescope Inspection of Impeller Rear Face 10/2003\n\nApplicability: Pratt and Whitney Canada (PWC) JT15D-1, JT15D-1A, and JT15D-1B engines which incorporate impeller Part Number (P/N) 3020365; and\n\n```html\n

1.

Which were not previously inspected per Overhaul Manual Revision 14; or later revisions; or

2.

Which have Serial Numbers (S/N) not listed in Table 1 of PWC Service Bulletin (S/B) 7590.

Requirement:

1.

Perform an inspection of the impeller in accordance with PWC S/B 7590 dated 23 May 2003.

2.

Repair or replace impellers that do not meet the inspection requirements of PWC S/B7590 dated 23 May 2003, or later revisions.

\n```\n\nNote: Canadian AD CF-2003-17 refers.\n\nCompliance: For Requirement 1:\n\nAt the next engine shop visit; or\n\nWithin 250 flight cycles for engines that have impellers with a Total Cycles Since New (TCSN) equal to, or greater than, 5000 flight cycles, whichever occurs first.\n\nFor Requirement 2:\n\nPrior to further flight following completion of Requirement 1 of this Directive. This Airworthiness Directive becomes effective on 2 October 2003.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with a narrow, well-defined scope targeting a specific unsafe condition in a specific engine model. The scope remains tightly focused on the impeller defect issue without expansion into broader operational or maintenance requirements."},"complexity_factors":["Short, single-purpose directive with clear applicability criteria","Only 2 requirements with straightforward conditional logic (whichever occurs first)","Heavy reliance on external documents (PWC Service Bulletin 7590, Overhaul Manual Revision 14) — the actual technical instructions are not reproduced in the AD itself","Simple compliance timeline with only two triggering conditions (shop visit vs. flight cycle threshold)","No defined terms section — relies on standard aviation terminology (TCSN, P/N, S/N, S/B)","Single cross-reference to Canadian AD CF-2003-17 for additional context"],"plain_english_summary":"This safety order requires operators of Pratt & Whitney Canada JT15D‑1, ‑1A and ‑1B engines fitted with impeller P/N 3020365 to perform a borescope inspection of the impeller rear face per Service Bulletin 7590, and to repair or replace any impeller that fails before the engine returns to service. \n\nInspections must occur at the next shop visit or within 250 flight cycles if the impeller has ≥5,000 cycles. It prevents catastrophic engine/aircraft damage from impeller failure."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive confines action to the specified JT15D engine models and impeller P/N and requires inspection and corrective action per the referenced service bulletin. It does not broaden applicability beyond those engines/parts or add new maintenance authorities; it sets timing and corrective requirements consistent with the stated unsafe‑condition remediation."},"complexity_factors":["Narrow technical scope: applies to specific engine models and a single impeller part number (P/N 3020365).","Dependency on external technical document: mandates procedures in PWC Service Bulletin 7590 (dated 23 May 2003).","Conditional applicability: excludes impellers already inspected per Overhaul Manual Revision 14 or listed S/Ns in S/B 7590 (adds screening complexity).","Timing rule complexity: compliance tied to either 'next engine shop visit' or a 250‑cycle threshold for TCSN ≥ 5,000, requiring operators to track cycles and maintenance events.","Operational consequence: failures must be repaired or replaced prior to further flight, creating immediate grounding/repair costs for affected aircraft."],"plain_english_summary":"Requires a borescope inspection of the rear face of impeller P/N 3020365 on Pratt & Whitney Canada JT15D‑1/1A/1B engines in line with PWC Service Bulletin 7590 (23 May 2003). Impellers that fail the inspection must be repaired or replaced. Owners/operators must arrange the inspection at the next engine shop visit or within 250 flight cycles if the impeller has 5,000 or more cycles; any required repair or replacement must be completed before further flight. The AD takes effect 2 October 2003."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jt15d-9-borescope-inspection-of-impeller-rear-face","history":"/api/acts/ad-jt15d-9-borescope-inspection-of-impeller-rear-face/history","analysis":"/api/acts/ad-jt15d-9-borescope-inspection-of-impeller-rear-face/analysis","conflicts":"/api/acts/ad-jt15d-9-borescope-inspection-of-impeller-rear-face/conflicts","importantCases":"/api/acts/ad-jt15d-9-borescope-inspection-of-impeller-rear-face/important-cases","documents":"/api/acts/ad-jt15d-9-borescope-inspection-of-impeller-rear-face/documents"}}