{"id":"F2006B06074","name":"AD/PC-12/11 - Flap System - Alternate Flap Capability Removal","slug":"ad-pc-12-11-flap-system-alternate-flap-capability-removal","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114472,"registerId":"commonwealth-F2006B06074-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PC-12/11 - Flap System - Alternate Flap Capability Removal","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-12/11 Flap System \\- Alternate Flap Capability Removal\n\n  \n13/98 DM\n\nApplicability: Model PC12 and PC12/45 aircraft with Manufacturer’s Serial Numbers (MSN) 101 to 227 (incl) and 232.\n\nRequirement: 1. Remove the ALTERNATE FLAP switch from the centre console in the cockpit and replace with a blanking plate in accordance with Pilatus Service Bulletin No. 27-004 dated 15 September 1998.\n\n    2. Install a FLAP MAINT switch in accordance with Pilatus Service Bulletin No. 27- 004 dated 15 September 1998.\n\n    3. Insert appropriate Pilatus Temporary Revisions into Pilot’s Operating Handbook and Aircraft Maintenance Manual in accordance with Pilatus Service Bulletin No. 27-004 dated 15 September 1998.\n\nNote: FOCA AD HB 98-352 dated 28 September 1998 refers.\n\nCompliance: Within 30 days of the effective date of this directive.\n\nThis Airworthiness Directive becomes effective on 4 November 1998.\n\nBackground: Investigations of accidents and operating techniques around the world have revealed that operating crews are misusing the Alternate Flaps system on the PC12 aircraft.\n\nFOCA has decided to remove the system from the centre console of the cockpit pending the issue of modifications to improve the reliability of the automatic PC12 flap system.","sortOrder":0}],"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific technical issue with a specific aircraft model. The scope remains precisely limited to the identified safety concern regarding the Alternate Flap system."},"complexity_factors":["Very short document (under 300 words)","Only 3 specific technical requirements","Single applicability criterion (specific serial number ranges)","No defined terms section","No cross-references to other legislation (only references to manufacturer service bulletins)","Simple unconditional compliance requirement with fixed deadline"],"plain_english_summary":"Owners/operators of Pilatus PC‑12 and PC‑12/45 (S/N 101–227, 232) must remove the cockpit \"Alternate Flap\" switch, fit a blanking plate, install a new \"FLAP MAINT\" switch, and update manuals. CASA issued this mandatory AD because misuse of the Alternate Flap system poses safety risks; the change is a temporary safety measure until a permanent fix is available. Compliance: within 30 days of 4 Nov 1998."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive implements a temporary removal of alternate flap capability for the listed PC-12 serial numbers and mandates installation and manual updates per the manufacturer’s service bulletin. It aligns with the stated purpose (preventing misuse pending a reliability modification) and does not expand obligations beyond those corrective actions."},"complexity_factors":["Narrow applicability: specific serial numbers only","Clear, prescriptive actions (remove switch, fit blanking plate, install switch, update manuals)","Short compliance period (30 days) increases operational scheduling pressure","Relies on external technical guidance (Pilatus Service Bulletin No. 27-004) for execution details","Work requires certified maintenance labour and parts—costs borne by owners/operators","Low regulatory discretion—directive specifies required modifications","Requires paperwork changes (temporary revisions) and crew awareness/training"],"plain_english_summary":"This airworthiness directive requires Pilatus PC-12 aircraft (MSN 101–227 and 232) to have the ALTERNATE FLAP switch removed, a blanking plate fitted, a FLAP MAINT switch installed, and temporary revisions inserted into the flight and maintenance manuals according to Pilatus Service Bulletin No. 27‑004. Compliance is required within 30 days of 4 November 1998. The cost and work fall to the aircraft owners/operators, and the change removes crew access to the alternate flap control while a reliability fix is developed to address reported misuse."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pc-12-11-flap-system-alternate-flap-capability-removal","history":"/api/acts/ad-pc-12-11-flap-system-alternate-flap-capability-removal/history","analysis":"/api/acts/ad-pc-12-11-flap-system-alternate-flap-capability-removal/analysis","conflicts":"/api/acts/ad-pc-12-11-flap-system-alternate-flap-capability-removal/conflicts","importantCases":"/api/acts/ad-pc-12-11-flap-system-alternate-flap-capability-removal/important-cases","documents":"/api/acts/ad-pc-12-11-flap-system-alternate-flap-capability-removal/documents"}}