{"id":"F2006B06380","name":"AD/PW100/11 - Mechanical Fuel Control - Inspection","slug":"ad-pw100-11-mechanical-fuel-control-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47658,"registerId":"commonwealth-F2006B06380-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\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 CAR 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 \\- PW100 Series","sortOrder":0},{"sectionNumber":"AD/PW100/11 Mechanical Fuel Control - In","sectionType":"part","heading":"AD/PW100/11 Mechanical Fuel Control - Inspection 10/2002","content":"# AD/PW100/11 Mechanical Fuel Control \\- Inspection 10/2002\n\nApplicability: All Pratt and Whitney Canada (P&WC) PW123, PW123B, PW123C, PW123D, PW123E, PW123AF, PW124B, PW125B, PW126, PW126A, PW127, PW127B,\n\nPW127C, PW127E, PW127F, PW127G, PW127J engines fitted with Honeywell Mechanical Fuel Control Units (MFCU) that have not been modified per\n\nP&WC SB 21562.\n\nRequirement: 1. Inspect the MFCU per P&WC SB 21669.\n\n    2. Repeat inspection of the MFCU per P&WC SB 21669.\n\n    3. Replace the MFCU with a unit modified per P&WC SB 21562, Rev 2 or later.\n\nNote: Transport Canada AD CF-2002-34 refers.\n\nCompliance: 1. Requirement 1: Carry out initial inspection within 400 flight hours, or at the next aircraft “A” check which ever occurs later after the effective date of this directive. If the MFCU does not meet the inspection criteria, replace it with a serviceable one before next flight.\n\n    2. Requirement 2: At intervals not to exceed 1200 flight hours or aircraft “3A” check whichever occurs later after the initial inspection. If the MFCU does not meet the inspection criteria, replace it with a serviceable one before next flight.\n    3. Requirement 3: Within 4500 flight hours or 24 months which ever occurs first after the effective date of this directive. This modification constitutes terminating action for repetitive inspection per Requirement 2.\n\nThis Airworthiness Directive becomes effective on 3 October 2002.","sortOrder":1}],"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 directive as published applies to the listed PW100 engine models with Honeywell MFCUs not modified per P&WC SB 21562 and mandates inspection, repeat inspection, and modification/replacement within set flight‑hour/time limits (Requirements and Compliance). The text does not indicate any expansion or narrowing of applicability beyond addressing the unsafe condition, so there is no clear change of scope from the instrument's stated corrective purpose."},"complexity_factors":["Cross-references to manufacturer service bulletins (P&WC SB 21669 for inspection; P&WC SB 21562 Rev 2 for modification) increase implementation dependence on external documents (Requirement 1–3).","Multiple, staggered compliance intervals: initial inspection within 400 flight hours or next A check; repetitive inspections every 1200 flight hours or 3A check; modification within 4500 flight hours or 24 months (Compliance 1–3).","Applicability covers numerous PW100 variants but only units not modified per SB 21562, requiring operators to determine modification status for fleet elements (Applicability).","Replacement/ modification is specified as terminating action for repetitive inspections, creating a trade-off between recurring inspection costs and one-time modification cost (Requirement 3; Compliance 3).","Operational impact: failed inspections require replacement before next flight, imposing potential AOG and scheduling costs (Compliance 1).","Regulatory enforcement delegated to CASA under CAR 1998 subregulation 39.1(1), creating administrative compliance obligation (header).","Note refers to Transport Canada AD CF-2002-34, indicating harmonisation with foreign authority guidance (Note)."],"plain_english_summary":"This Airworthiness Directive requires operators of specified Pratt & Whitney PW100 engines fitted with Honeywell mechanical fuel control units (unless already modified per P&WC SB 21562) to inspect the mechanical fuel control unit per P&WC SB 21669, carry out repeat inspections at set intervals, and replace or modify the unit (P&WC SB 21562 Rev 2+) within specified flight‑hour/time limits to correct an unsafe condition. The certificated operator/maintenance organisation bears the inspection and modification costs; CASA enforces compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive with a narrow, specific scope (particular engine models with specific unmodified fuel control units). It has not expanded beyond its original purpose of addressing a known unsafe condition in these specific components."},"complexity_factors":["Short, single-purpose document (approximately 300 words)","Only 3 main requirements with clear sequential logic","Limited defined terms (relies on external references to manufacturer service bulletins rather than defining technical standards within the text)","Simple conditional structure (if inspection fails → replace before next flight)","Clear compliance deadlines using objective criteria (flight hours, calendar months, maintenance check intervals)","No nested exceptions or complex cross-referencing to other legislation beyond a single reference to Canadian Transport Canada AD"],"plain_english_summary":"This CASA airworthiness directive targets Pratt & Whitney Canada PW100-series turboprop engines fitted with certain Honeywell mechanical fuel control units. It mandates initial and recurring inspections and a mandatory replacement with a modified unit to address an unsafe fuel-control condition.\n\nOperators of affected PW123–PW127 variants not already modified under P&WC SB 21562 must inspect within specified flight-hour/check intervals and complete replacement within the directive’s flight-hour or time limits to prevent engine performance loss or failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pw100-11-mechanical-fuel-control-inspection","history":"/api/acts/ad-pw100-11-mechanical-fuel-control-inspection/history","analysis":"/api/acts/ad-pw100-11-mechanical-fuel-control-inspection/analysis","conflicts":"/api/acts/ad-pw100-11-mechanical-fuel-control-inspection/conflicts","importantCases":"/api/acts/ad-pw100-11-mechanical-fuel-control-inspection/important-cases","documents":"/api/acts/ad-pw100-11-mechanical-fuel-control-inspection/documents"}}