SAIB ACE-96-08 —

No. ACE-96-08 November 8, 1996 Published by: FAA, AFS-610, P.O. Box 26460, Oklahoma City, OK 73125 This is issued for informational purposes only and any recommendation for corrective action is not mandatory.

INTRODUCTION:

The purpose of this Special Airworthiness Information Bulletin is to advise operators of Pilatus PC-6 and PC-12 airplanes of the need to review the service letter and bulletins listed below.

BACKGROUND:

The Small Airplane Directorate, Aircraft Certification Service, of the Federal Aviation Administration (FAA) conducted a review of specified Pilatus airplane service letters and bulletins. The purpose of the review was to evaluate each service letter and bulletin to determine the continued airworthiness safety aspect. The options considered by the FAA included: mandated compliance by initiation of an FAA Airworthiness Directive (AD), various forms of notices, or no further action required.

RECOMMENDATIONS:

The service letter and bulletins identified in this document were not considered appropriate for AD action at this time, however, the FAA strongly suggests that all operators of the specified Pilatus Model PC-6 and PC-12 airplanes review their compliance of the service letter and bulletins listed below.

Service Letter No. Date Title (Model Affected) SL - 079 March 11, 1996 Model PC-6, Hartzell Service Letter HC-SL-61- 165 (Dec 7/95) Propeller Abnormal/Vibration or Grease Leakage SL - 080 August 28, 1996 Model PC-6, Configuration of Flight Control Cables 24-003 June 20, 1996 Model PC-12, Rewiring of the Automatic Disconnect Circuit for the Non-Essential Bus and Check of the Navigation Converter (KN 40) for Correct Wiring 28-002 July 19, 1996 Model PC-12, Installation of a New Fuel Emergency Shut-Off Lever 21-001 July 1, l996 Model PC-12, Pressure Control System Installation-Solenoid Valve 29-001 July 1, 1996 Model PC-12, Modification of the Hydraulic Hand- Pump Handle

PC-6-168 June 6, l995 Model PC-6, EPU Over-Voltage Protection Device PC-6-169 June 20, 1995 Model PC-6, Improved Tail Wheel Assembly (P/N: 114.45.06.050) for H4 Configuration

The service letter and bulletins can be obtained from:

Pilatus Aircraft LTD.

CH-6370 STANS,

SWITZERLAND

FOR FURTHER INFORMATION CONTACT: Roman T. Gabrys, Aerospace Engineer, FAA, Project Support Branch (ACE-112), Small Airplane Directorate, 1201 Walnut, Suite 900, Kansas City, Missouri 64106, telephone (816) 426-6934.