{"id":"F2006B10866","name":"AD/JBK 117/18 - One Engine Inoperative Performance Check","slug":"ad-jbk-117-18-one-engine-inoperative-performance-check","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56364,"registerId":"commonwealth-F2006B10866-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.002.png)\n\n![](image.002.png)  \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.","sortOrder":0},{"sectionNumber":"AD/JBK 117/18 One Engine Inoperative Per","sectionType":"part","heading":"AD/JBK 117/18 One Engine Inoperative Performance Check 6/2000","content":"# AD/JBK 117/18 One Engine Inoperative Performance Check 6/2000\n\nDM\n\nApplicability: All Model BK 117 B1 or B2 helicopters fitted with LTS101-750B-1 engines equipped with an acceleration schedule biasing system incorporated by field compliance with SB LTS101B-73-10-0133 or, where the engine is identified by suffix “B” after the engine serial number, or engines fitted with FCU P/N 4-301-413-02, -03 or -04.\n\nRequirement: 1. Affix placards in accordance with the instructions contained paragraph 9 (1) of Kawasaki SB KSB-117-161.\n\n    2. Revise the Limitation section of the JCAB approved flight manual to include the following wording.\n\nHeating system/ECS\n\n![](image.003.png)  \n\nThe flight manual amendment action required by this Directive may be accomplished by inserting a copy of this Directive in the Flight Manual Limitation Section facing page 2.20.\n\n    3. Install cap P/N AN929-4J, MS51532B4S or equivalent on pressure ratio switch elbow P/N MS51522B4S as detailed in paragraph 9. (2) of Kawasaki SB KSB- 117-161. Upon installation of the cap remove placard restricting Heater/ECS operation.\n\nNote 1: Altitude Limitation placards must remain in place until further notice. Note 2: JCAB AD TCD-5097A-99 refers.","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":4,"scope_assessment":{"changed":false,"description":"The AD applies to BK117 B1/B2 helicopters with the listed engines or FCU part numbers and prescribes specific modifications and placards. The text provides no indication that the applicability has been expanded or narrowed beyond those aircraft/configurations or that it changes the scope of the referenced Kawasaki service bulletin or JCAB AD."},"complexity_factors":["Technical specificity: exact engine models, engine serial-number suffix and precise FCU and cap part numbers increase identification complexity.","Cross-references: compliance depends on Kawasaki SB KSB-117-161 and JCAB AD TCD-5097A-99 for detailed instructions.","Operational constraint: temporary Heater/ECS restriction until hardware is fitted imposes an operational limitation on operators.","Conditional removal of placard: removal of the restriction placard is contingent on installation of the specified cap, requiring inspection/verification.","Field compliance history: applicability includes engines modified by prior field compliance with an SB, requiring records checks to determine affected aircraft."],"plain_english_summary":"This Airworthiness Directive requires operators of BK117 B1/B2 helicopters with specified LTS101-750B-1 engines (including engines marked with suffix “B”) or particular FCU part numbers to fit a protective cap on a pressure‑ratio switch, add cockpit placards, and amend the flight‑manual limitations. It changes equipment and operating limits to address a one‑engine‑inoperative performance concern.\n\nCASA’s delegate issues the requirement; operators pay for parts, placards and manual changes and must restrict Heater/ECS use until the cap is installed. Compliance follows Kawasaki service bulletin and a referenced JCAB AD."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This appears to be a standard, targeted airworthiness directive addressing a specific unsafe condition in a defined aircraft population. The scope remains tightly focused on the original safety issue regarding one-engine-inoperative performance and heating system interactions."},"complexity_factors":["Highly specific technical applicability criteria involving engine serial number suffixes and part numbers","Three distinct compliance actions with cross-references to external manufacturer service bulletins (Kawasaki SB KSB-117-161)","Conditional logic: removal of one placard is contingent upon completion of the cap installation","Reference to Japanese aviation authority documentation (JCAB AD TCD-5097A-99) indicating international regulatory coordination","Embedded image references that appear to contain technical diagrams or placard text not fully rendered in the source"],"plain_english_summary":"This mandatory CASA Airworthiness Directive affects Kawasaki BK 117 B1/B2 helicopters with certain LTS101-750B-1 engines or fuel control units. It requires placards, a flight manual update and a protective cap to prevent the heating/environmental system from unexpectedly using excessive power during one‑engine‑inoperative flight. The measures reduce loss of available power and ensure pilots know and avoid the associated safety risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jbk-117-18-one-engine-inoperative-performance-check","history":"/api/acts/ad-jbk-117-18-one-engine-inoperative-performance-check/history","analysis":"/api/acts/ad-jbk-117-18-one-engine-inoperative-performance-check/analysis","conflicts":"/api/acts/ad-jbk-117-18-one-engine-inoperative-performance-check/conflicts","importantCases":"/api/acts/ad-jbk-117-18-one-engine-inoperative-performance-check/important-cases","documents":"/api/acts/ad-jbk-117-18-one-engine-inoperative-performance-check/documents"}}