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PILATUS AIRCRAFT LTD. CH-6371 STANS, SWITZERLAND SERVICE LETTER SUBJECT: FLIGHT CONTROLS GUST LOCK To all Customers, Operators and Service Centers: Date: Apr 23/09 This Service Letter is issued to draw attention to the following information: Reports of damage to the rudder have been received after the aircraft has been parked in very gusty conditions. The damage is caused by interference of the rudder balance weight (when the rudder is fully deflected) with the vertical stabilizer skin. A flight control gust lock has now been identified and is supplied by: York Gust Locks, P.O. Box 871, Franconia, NH 03580 www.gustlock.com Part Number: 526W Pilatus recommends the use of the above gust lock for all aircraft being parked outside. CAUTION: DO NOT TOW OR TAXI THE AIRCRAFT WHEN THE GUST LOCK IS INSTALLED. THE GUST LOCK COULD SLIP OFF THE RUDDER PEDALS AND THEN NOT LOCK THE CONTROLS CORRECTLY. NOTE: The field reports resulted in a configuration change to the PC-12 NG, introducing a new rudder balance weight to avoid possible interference between the rudder and the vertical stabilizer. This improvement has also now been included into the technical manuals for the PC-12. Operators requiring further information on this subject, please contact one of the addresses given below: PILATUS AIRCRAFT LTD., PILATUS BUSINESS AIRCRAFT LTD., PILATUS AUSTRALIA (Pty.) LTD., CUSTOMER SUPPORT MANAGER, PRODUCT SUPPORT DEPARTMENT, 17 James Schofield Drive, CH-6371 STANS, 11755 AIRPORT WAY, Adelaide Airport SA 5950, SWITZERLAND. BROOMFIELD, CO 80021. AUSTRALIA USA General Aviation Tel : +61 (08) 8234 4433 Tel : + 41 41 619 6208 Tel : 303 465 9099 Fax: +61 (08) 8234 4499 Fax: + 41 41 619 7311 Fax: 303 465 6040 Free Call: 1800 445 007 eMail: [email protected] eMail: [email protected] eMail: [email protected] Attachments: None SERVICE LETTER 138 PAGE 1 of 1 .

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