Pilot’s alternate static air source

TM 1-1510-225-MTF PROCEDURE CRUISE (CONT) TROUBLESHOOTING REFERENCE air noise in the cabin from around the perimeter of doors and windows. Check for undue noise in the cabin due to vibrating and rattling articles or oil canning of skins. *11. Pilot’s alternate static air source - Check as follows: (a) Maintain level flight and note air- speed and altitude. (b) Pilot’s alternate static air source switch - ALTERNATE. Verify that airspeed indicator, altimeter, and vertical speed indicator read- ings increase. (c) Pilot’s alternate static air source switch - NORMAL. Airspeed indicator, altimeter, and vertical speed indicator indications should return to their original readings. *12. Propeller synchrophaser - Check cap- turing ability of the synchrophaser by establishing a small out of synchroni- zation condition, then turning the syn- chrophaser on. Verify that synchroni- zation is established and held within a few seconds. 13. Maximum ITT/N, availability - Per- form as required (Chapter 4). 14. Speed performance at maximum cruise power - Perform as required (Chapter 4). 15. Engine performance at maximum con- tinuous power - Perform as required (Chapter 4). 2-48