{"id":"F2006B06561","name":"AD/RB211/30 - Thrust Reverser Inspection","slug":"ad-rb211-30-thrust-reverser-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48307,"registerId":"commonwealth-F2006B06561-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\n![](image.001.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.\n\nRolls Royce Turbine Engines \\- RB211 Series","sortOrder":0},{"sectionNumber":"AD/RB211/30 Thrust Reverser Inspection 5","sectionType":"part","heading":"AD/RB211/30 Thrust Reverser Inspection 5/2002","content":"# AD/RB211/30 Thrust Reverser Inspection 5/2002\n\nApplicability: Rolls Royce RB211-524G, \\-524G-T, –524H, and –524H-T series engines as identified in Rolls Royce Mandatory SB RB.211-78-9574 Revision 2.\n\nRequirement: Perform initial and repeat inspections as detailed in Rolls Royce Mandatory SB RB.211-78-9574, Revision 2.\n\nCompliance: Within 700 flight hours after the effective date of this Directive and thereafter at intervals not to exceed 700 flight hours.\n\nThis Airworthiness Directive becomes effective on 16 May 2002.\n\nBackground: The fuel control of the above engines may not cut back thrust in the unlikely event of an in-flight thrust reverser deployment if the Thrust Reverser Cowl Position (TCRP) resolver rigging is less than plus 1 percent on the identified engines. This AD repetitively checks for the correct rigging.\n\n![Signature of Eugene Paul Holzapfel Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 3 April 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 24 April 2002.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The Directive's scope aligns with its stated purpose: it targets specified RB211‑524 engine variants and mandates inspections per the Rolls‑Royce service bulletin within 700 flight‑hour intervals to correct the unsafe condition described. No expansion or narrowing of the applicability or requirements is indicated in the text provided."},"complexity_factors":["Technical specificity: inspection targets TCRP resolver rigging and its interaction with the engine fuel‑control system (Background).","Dependence on an external normative document: inspection procedures are contained in Rolls Royce Mandatory SB RB.211‑78‑9574 Revision 2 (Requirement, Applicability).","Model‑specific applicability: applies only to RB211‑524G, ‑524G‑T, ‑524H and ‑524H‑T engines (Applicability).","Fixed repetitive compliance interval: initial action and repeat inspections mandated within and at intervals not exceeding 700 flight hours (Compliance).","Regulatory basis and timing: issued under CAR 1998 subreg 39.1(1) with a specific effective date (header; Compliance effective date 16 May 2002).","Operational burden: operators must schedule inspections, record compliance, and absorb maintenance downtime and costs.","Safety‑critical consequences: inspection affects engine behaviour during an unlikely in‑flight thrust reverser deployment, raising implementation and oversight importance."],"plain_english_summary":"This Airworthiness Directive requires operators of aircraft with Rolls‑Royce RB211-524G, -524G‑T, -524H and -524H‑T engines to carry out the initial and repeat thrust‑reverser inspections set out in Rolls Royce Mandatory SB RB.211‑78‑9574 Revision 2. Inspections must start within 700 flight hours of the AD’s effective date and recur no more than every 700 flight hours. CASA says the checks address a risk that incorrect Thrust Reverser Cowl Position (TCRP) resolver rigging could prevent the fuel control cutting back thrust after an in‑flight reverser deployment, so operators bear the inspection cost and scheduling burden to mitigate that safety risk."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope — addressing a specific unsafe condition in specific engine models through repetitive inspection. There is no evidence of scope creep; it targets exactly the safety issue identified in the background (TCRP resolver rigging) without expanding to unrelated systems or operational requirements."},"complexity_factors":["Very short document (approximately 250 words)","Only 4 defined engine models in applicability section","Single requirement with clear cross-reference to industry standard (Rolls Royce Service Bulletin)","Simple compliance timeline: initial inspection + recurring 700-hour intervals","No nested exceptions, conditional logic, or alternative compliance methods","Background explanation is straightforward and technical but not legally complex"],"plain_english_summary":"This CASA safety order requires operators of Rolls‑Royce RB211‑524G/524G‑T/524H/524H‑T engines to inspect and verify calibration of the Thrust Reverser Cowl Position (TCRP) resolver per Rolls‑Royce Service Bulletin RB.211‑78‑9574 (Rev 2). \n\nIt matters because a misrigged TCRP could fail to reduce engine power if a thrust reverser deploys in flight, creating dangerous drag and potential loss of control; inspections are required every 700 flight hours."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rb211-30-thrust-reverser-inspection","history":"/api/acts/ad-rb211-30-thrust-reverser-inspection/history","analysis":"/api/acts/ad-rb211-30-thrust-reverser-inspection/analysis","conflicts":"/api/acts/ad-rb211-30-thrust-reverser-inspection/conflicts","importantCases":"/api/acts/ad-rb211-30-thrust-reverser-inspection/important-cases","documents":"/api/acts/ad-rb211-30-thrust-reverser-inspection/documents"}}