{"id":"F2006B06388","name":"AD/PW100/9 - Fuel Heater","slug":"ad-pw100-9-fuel-heater","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47684,"registerId":"commonwealth-F2006B06388-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 - PW 100 Series","sortOrder":0},{"sectionNumber":"AD/PW 100/9 Fuel Heater 4/2001","sectionType":"part","heading":"AD/PW 100/9 Fuel Heater 4/2001","content":"# AD/PW 100/9 Fuel Heater 4/2001\n\nApplicability: All PW100 Series engines not incorporating the improved fuel heater introduced by Pratt and Whitney Canada Service Bulletin PW100-72-21100.\n\nRequirement: 1. Replace Stewart Warner fuel heaters, P/No 10718 (all series numbers), with improved heaters in accordance with Pratt and Whitney Canada (PWC) Service Bulletin PW100-72-21100, Revision 2 and PWC Service Information Letter (SIL) PW100-074.\n\n2. No person shall install a pre-SB PW100-72-21100 configuration fuel heater on an Australian registered aircraft.\n\nNote 1: Transport Canada AD CF-2000-34 refers.\n\nNote 2: Compliance with previous issues of SB PW100-72-21100 satisfies the intent of this Airworthiness Directive.\n\nCompliance: 1.(a) For fuel heaters listed in Tables 1 and 2 of SIL PW100-074, replace the fuel heater at the next scheduled low pressure fuel filter removal after the effective date of this Directive, or 31 August 2002, whichever occurs first.\n\n1.(b) For fuel heaters not listed in Tables 1 and 2 of SIL PW100-074, replace the fuel heater no later than 31 August 2002.\n\n2. After 19 May 2001.\n\nThis Airworthiness Directive becomes effective on 19 April 2001.","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, specific safety purpose—replacing a defective fuel heater component. The scope remains tightly focused on the identified unsafe condition in PW100 engines and has not expanded beyond this original technical safety mandate."},"complexity_factors":["Short, single-purpose directive with clear applicability and requirement sections","Only 2 main requirements with straightforward compliance dates","Cross-references to 2 external manufacturer documents (Service Bulletin and Service Information Letter) that contain the actual technical procedures","Simple conditional logic: two compliance paths based on whether the heater appears in specific tables of the referenced SIL","Minimal defined terms (only standard aviation terminology like 'P/No' for part number)","No nested exceptions or complex legislative cross-referencing"],"plain_english_summary":"This CASA safety order requires owners/operators of PW100-series engines fitted with Stewart Warner fuel heaters (PN 10718) to replace them with the redesigned heater per Pratt & Whitney Canada Service Bulletin PW100-72-21100 Rev 2. It affects Australian airlines, maintenance organisations and engineers. The action prevents an identified unsafe condition (risk of engine failure/fire); installation of the old heater was banned from 19 May 2001 and all affected units had to be replaced by 31 August 2002."},"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":4,"scope_assessment":{"changed":false,"description":"The AD explicitly applies to \"All PW100 Series engines not incorporating the improved fuel heater\" and prescribes replacement and installation prohibition. The text contains no indication that the AD's stated applicability or scope was altered from an earlier version within this instrument."},"complexity_factors":["Technical specificity: identifies engine family (PW100), exact heater part number (Stewart Warner P/No 10718) and referenced service documents (SB PW100-72-21100 Rev 2; SIL PW100-074).","Multiple compliance paths: different deadlines depending on whether a heater appears in Tables 1–2 of the SIL versus not (Compliance 1.(a)–1.(b)).","Operational scheduling interaction: allows replacement at the next scheduled low-pressure fuel filter removal, linking airworthiness action to maintenance cycles (Compliance 1.(a)).","Absolute prohibition: a post-effective-date installation ban on pre-SB heaters requires supply-chain controls and maintenance discipline (Requirement 2; Compliance 2).","Cross-references to external instruments: refers to Transport Canada AD CF-2000-34 and multiple PWC documents, requiring access to external material to confirm applicability and parts lists (Notes; Requirement).","Date-driven enforcement: separate effective date (19 April 2001) and installation prohibition start (after 19 May 2001) create temporal compliance monitoring needs (Compliance)."],"plain_english_summary":"This Airworthiness Directive requires replacement of pre-improved Stewart Warner fuel heaters (P/No 10718) in Pratt & Whitney Canada PW100-series engines with the improved unit using PWC Service Bulletin PW100-72-21100 (Revision 2) and SIL PW100-074, and bans reinstalling the pre-SB heater on Australian aircraft (Requirement 1–2). Operators must complete replacements by either the next scheduled low-pressure fuel filter removal or by 31 August 2002 depending on heater listing; the AD is effective 19 April 2001 (Compliance)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pw100-9-fuel-heater","history":"/api/acts/ad-pw100-9-fuel-heater/history","analysis":"/api/acts/ad-pw100-9-fuel-heater/analysis","conflicts":"/api/acts/ad-pw100-9-fuel-heater/conflicts","importantCases":"/api/acts/ad-pw100-9-fuel-heater/important-cases","documents":"/api/acts/ad-pw100-9-fuel-heater/documents"}}