Commonwealth legislation

AD/PC-12/10 - Fuel Storage - Vent Valve System

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Commonwealth

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legislative instrument

Plain English Summary

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This directive requires owners/operators of Pilatus PC-12 and PC-12/45 aeroplanes (serials 101–230) to modify the fuel storage vent system: remove inward vent valves and install float valves with flame arrestors per Pilatus Service Bulletin No.28-005. Compliance is mandatory within 60 days and the AD took effect 27 May 1998.

The regulator says the change responds to reports that inward vent valves could fail shut, allowing booster-pump operation to damage wing skin. Owners/operators bear the cost and downtime; the AD replaces an earlier interim measure (AD/PC-12/9 Amdt 1).

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AD/PC-12/10 - Fuel Storage - Vent Valve System

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Pilatus PC-12 Series Aeroplanes

AD/PC-12/10 Fuel Storage - Vent Valve System 8/98 DM

Applicability: Model PC-12 and PC-12/45 airplanes serial numbers 101 - 230 (incl).

Requirement: Modify the fuel storage vent valve system by removing the inward vent valves and installing float valves and flame arrestors in accordance with the requirements of Pilatus Service Bulletin No.28-005 dated 04 May 1998. This Directive supersedes the requirements of AD/PC-12/9 Amdt 1 dated 4 December 1997 which will be cancelled.

Note: FOCA AD HB 98-126 dated 15 May 1998 refers.

Compliance: Within 60 days of the effective date of this AD.

This airworthiness directive becomes effective on 27 May 1998.

Background: Reports of abnormal automatic engagement of the fuel booster pumps during normal aircraft operations revealed that under certain circumstances the inward vent valves could fail shut. In this condition, operation of the boost pumps could cause permanent damage to the wing skin structure. Interim measures introduced under AD/PC-12/9 have since been found to be ineffective and a full modification of the fuel storage vent system has now been introduced. This Directive mandates the incorporation of the vent system modification and advises cancellation of AD/PC- 12/9 Amdt 1 dated 04 December 1997.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/PC-12/10 - Fuel Storage - Vent Valve System