P I T O T S T A T I C S Y S T E M O P E R A T I O N A L C H E C K ( C o n t i n u e d)

PITOT STATIC SYSTEM OPERATIONAL CHECK (Continued) - TM-55-1520-240-T-2_57

PITOT STATIC SYSTEM OPERATIONAL CHECK (Continued) - TM-55-1520-240-T-2_59

TM-55-1520-240-T-2 CH-47D Heilcopter Manual
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TM 55-1520-240-T 8 - 1 . 4 P I T O T S T A T I C S Y S T E M O P E R A T I O N A L C H E C K ( C o n t i n u e d) 8 - 1 . 4 T A S K R E S U LT PITOT SYSTEM CHECK 12. 13. 14. Do not apply vacuum to pitot lines. Damage to airspeed indica- tors can result. At both AFCS computers disconnect and cap off both pitot tube compression sleeve fittings. Connect tester (13) to both pitot masts (4 and Airspeed shall not decrease more than 10 knots in 5 5) and adjust of 150 knots off pressure. pressure for an airspeed indication minutes. If it does leak, go to task 8-1.13. on tester airspeed indicator. Shut NOTE Airspeed must be corrected for tes- ter leak rate. Refer to TM 55-4920- 231-14. If PITOT system does not leak and there is a log book entry indicating a pitot leak, check AFCS computer in suspected system and replace AFCS computer. Disconnect tester (13) from both pitot masts (4 and 5). Remove caps and connect compression sleeve fittings to their respective AFCS com- puters. 8-8 Change 4

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