{"id":"F2006B06107","name":"AD/PC-12/5 - Hydraulic Hand Pump","slug":"ad-pc-12-5-hydraulic-hand-pump","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46856,"registerId":"commonwealth-F2006B06107-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PC-12/5 - Hydraulic Hand Pump","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nPilatus PC-12 Series Aeroplanes\n\nAD/PC-12/5 Hydraulic Hand Pump 2/97\n\nApplicability: All PC-12 aircraft from S/N 101 up to and including S/N 153.\n\nRequirement: Incorporate Pilatus modification 960341 as detailed in Pilatus PC XII Service Bulletin No 29-001 dated Jul 01, 96.\n\nNote: Swiss FOCA AD HB96-139 dated 18-03-1996 refers.\n\nCompliance: Unless previously carried out action within 300 hours time in service from an effective date of 30 January 1997 or by 30 April 1997, whichever occurs first.\n\nBackground: The manufacturer has advised of a hand pump non return valve failure which resulted in main system hydraulic pressure entering the hand pump. This pressure caused the hand pump handle to come in contact with the top of the nose wheel well which then forced the pump body to move upwards and impact on the PCL quadrant assembly.\n\nThis caused the PCL movement to be stiff during flight.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument sets a targeted scope (Pilatus PC-12 aircraft S/N 101–153) and prescribes a single mandated modification with a defined compliance window. The text contains no indication that the scope has been altered from its stated applicability or that the requirement was expanded or narrowed relative to the directive itself."},"complexity_factors":["Narrow, clearly defined applicability: single, small serial-number range (S/N 101–153) reduces scope complexity. (Applicability)","Single required action: incorporation of one manufacturer modification (960341) keeps the technical requirement focused. (Requirement)","Dependency on external technical document: the AD mandates the service bulletin for procedural detail, requiring operators to source and follow that document. (Requirement)","Dual compliance deadline: requirement is framed as within 300 hours or by a calendar date, creating a scheduling constraint that operators must monitor. (Compliance)","Verification of prior compliance: operators must establish whether the modification has already been carried out to determine obligation, adding a minor administrative step. (Compliance)","Cross-reference to foreign regulator's AD may require checking consistency but does not add procedural complexity within this AD. (Note)"],"plain_english_summary":"This AD mandates incorporation of Pilatus modification 960341 (per Pilatus PC‑12 Service Bulletin No. 29‑001, 1 Jul 1996) on PC‑12 aircraft S/N 101–153, to be done within 300 flight hours after 30 Jan 1997 or by 30 Apr 1997, whichever is earlier.  \n\nIt’s required by the regulator, enforced on owners/operators who pay costs, and was ordered to prevent a hand‑pump non‑return valve failure that can stiffen the power control lever in flight."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific mechanical defect in a defined aircraft population. It has not expanded beyond its original purpose of mandating a manufacturer-recommended safety modification."},"complexity_factors":["Single, specific applicability criterion (serial number range)","One clear compliance action (install specific modification)","Single cross-reference to manufacturer service bulletin","Simple alternative deadline structure (whichever occurs first)","No defined terms section","No nested exceptions or conditional logic","Background provided in plain narrative form"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific repairs or modifications to aircraft.\n\n**What it does:** It orders owners and operators of certain Pilatus PC-12 aircraft (serial numbers 101 through 153) to install a specific factory modification to the hydraulic hand pump system. The modification (Pilatus modification 960341) fixes a dangerous design flaw where a failed valve could let high-pressure hydraulic fluid backflow into the hand pump.\n\n**Why it matters:** Without this fix, hydraulic pressure can force the hand pump handle to hit the nose wheel well, pushing the pump body upward into the Power Control Lever (PCL) quadrant — the controls for engine power. This makes the throttle levers stiff and hard to move during flight, which could prevent pilots from properly controlling engine power, creating a serious flight safety risk.\n\n**Who must comply:** Anyone operating affected PC-12 aircraft must complete the modification within 300 flight hours or by 30 April 1997, whichever comes first (unless already done).\n\n**Key details:**\n- **Applies to:** PC-12 aircraft serial numbers 101–153\n- **Action required:** Install Pilatus modification per Service Bulletin 29-001\n- **Deadline:** 300 flight hours or 30 April 1997 (whichever is sooner)\n- **Root cause:** Faulty non-return valve in hydraulic hand pump"}},"importantCases":[],"_links":{"self":"/api/acts/ad-pc-12-5-hydraulic-hand-pump","history":"/api/acts/ad-pc-12-5-hydraulic-hand-pump/history","analysis":"/api/acts/ad-pc-12-5-hydraulic-hand-pump/analysis","conflicts":"/api/acts/ad-pc-12-5-hydraulic-hand-pump/conflicts","importantCases":"/api/acts/ad-pc-12-5-hydraulic-hand-pump/important-cases","documents":"/api/acts/ad-pc-12-5-hydraulic-hand-pump/documents"}}