{"id":"F2006B03385","name":"AD/B767/3 - Pneumatic Air Supply PRSOV Actuator Linkage - Inspection and Modification","slug":"ad-b767-3-pneumatic-air-supply-prsov-actuator-linkage-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42887,"registerId":"commonwealth-F2006B03385-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B767/3 - Pneumatic Air Supply PRSOV Actuator Linkage - Inspection and Modification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Boeing 767 Series Aeroplanes\n\n \n\nAD/B767/3 Pneumatic Air Supply PRSOV Actuator\n\nLinkage - Inspection and Modification\n\n\n7/85\n\nTX\n\n \n\nApplicability: All models equipped with Pressure Regulating and shut off Valves Part Nos. 773288- 4 and 773288-5.\n\n \n\nRequirement: Boeing Alert Service Bulletin 767-36A0015. Compliance:  As detailed in the requirement document.\n\nBackground: The manufacturer has reported an incident where a failure of the PRSOV caused the pneumatic ducting to be subjected to high pressure air. Considerable damage resulted and jamming of the flap and breakage of the throttle control occurred.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive defines a targeted safety requirement rather than changing the set of aircraft or systems subject to regulation. It applies to all Boeing 767 models that have the specified PRSOV part numbers (Applicability) and requires work specified in Boeing Alert Service Bulletin 767-36A0015 (Requirement). There is no text in the instrument that expands or narrows the population beyond the stated applicability or that alters regulatory authority; it simply imposes the inspection/modification obligation for the identified parts in response to the reported incident (Background)."},"complexity_factors":["Narrow technical applicability (specific PRSOV part numbers 773288-4 and 773288-5) (Applicability).","Primary obligation is to follow an external document (Boeing Alert Service Bulletin 767-36A0015), creating dependency on that bulletin for specifics (Requirement).","Compliance timing and procedural detail are not stated in the directive itself, requiring consultation of the service bulletin to determine deadlines and steps (Compliance).","Operational impacts (maintenance labour, parts, aircraft downtime) are implied but not quantified, requiring operators to estimate and manage these burdens (Requirement; Compliance).","Enforcement and verification rest with the aviation regulator, while technical execution rests with maintenance organisations—two different actors with distinct responsibilities (Requirement; Compliance)."],"plain_english_summary":"This directive requires operators of Boeing 767s fitted with PRSOV part numbers 773288‑4 or 773288‑5 to carry out inspections and modifications specified in Boeing Alert Service Bulletin 767‑36A0015. It responds to a reported PRSOV failure that damaged pneumatic ducting, jammed flaps and broke throttle controls, so compliance by operators and maintenance organisations is needed to restore airworthiness. Operators bear the costs; the CAA enforces the requirement."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in specific aircraft models. It has not expanded beyond its original purpose of mandating inspection/modification of the PRSOV actuator linkage."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 2 defined part numbers in the applicability section","Single requirement referencing an external technical document (Boeing Service Bulletin)","No nested exceptions, conditional logic, or cross-references to other legislation","Straightforward command structure: identify affected aircraft → reference technical standard → mandate compliance","Background section provides clear safety rationale without legal caveats"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nIt requires owners and operators of **Boeing 767 aircraft** to inspect and modify a specific part called the **PRSOV (Pressure Regulating and Shut-Off Valve)** actuator linkage. This valve controls high-pressure air in the plane's pneumatic system.\n\n**Who it affects:**\nAnyone who owns or operates Boeing 767 models fitted with specific valve part numbers: **773288-4 and 773288-5**.\n\n**Why it matters:**\nThe manufacturer (Boeing) reported a serious incident where one of these valves failed. The failure caused:\n- High-pressure air to damage the pneumatic ducting (the pipes that carry pressurised air)\n- The aircraft flaps to jam (flaps are the movable surfaces on wings that help with lift and control)\n- The throttle control to break (the throttle controls engine power)\n\nThis could obviously lead to loss of control or an accident. The directive mandates following **Boeing Alert Service Bulletin 767-36A0015** to fix the problem before it causes an accident.\n\n**What must be done:**\nOperators must comply with the specific inspection and modification instructions in the referenced Boeing service bulletin. The exact deadlines and procedures are set out in that document rather than in this directive itself."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-3-pneumatic-air-supply-prsov-actuator-linkage-inspection-and-modification","history":"/api/acts/ad-b767-3-pneumatic-air-supply-prsov-actuator-linkage-inspection-and-modification/history","analysis":"/api/acts/ad-b767-3-pneumatic-air-supply-prsov-actuator-linkage-inspection-and-modification/analysis","conflicts":"/api/acts/ad-b767-3-pneumatic-air-supply-prsov-actuator-linkage-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-b767-3-pneumatic-air-supply-prsov-actuator-linkage-inspection-and-modification/important-cases","documents":"/api/acts/ad-b767-3-pneumatic-air-supply-prsov-actuator-linkage-inspection-and-modification/documents"}}