PITOT STATIC SYSTEM OPERATIONAL CHECK (Continued)

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)

P I T O T H E A T C I R C U I T B R E A K E R W I L L N O T S T A Y C L O S ED

TM-55-1520-240-T-2 CH-47D Heilcopter Manual
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TM 55-1520-240-T 8-1.4 PITOT STATIC SYSTEM OPERATIONAL CHECK (Continued) 8 - 1 . 4 T A S K R E S U L T SIDESLIP LEAK TEST 15. 16. 17. 18. 19. 20. 21. 22. Cover holes in sideslip ports (6, 7, 8, and 9). Use barrier material (C67) and secure with masking tape (C337). Disconnect NO. 1 AFCS left and right sideslip tubes from computer. Connect to vacuum port on tester (13). Adjust vacuum at a rate less than 3,000 feet per minute until tester (13) altimeter reads 20.000 feet. Remove tester (13) from NO. 1 AFCS left and right sideslip tubes and connect to their respective fittings on NO. 1 AFCS computer. Disconnect NO. 2 AFCS left and right sideslip tubes from computer. Connect to vacuum port on tester. Adjust vacuum at a rate less than 3,000 feet per minute until tester (13) altimeter reads 20,000 feet. Remove tester (13) from NO. 2 AFCS left and right sideslip tubes and connect to their respective fittings on NO. 2 AFCS computer. Remove tape and barrier material from all four sideslip ports Shut off vacuum pressure. Tester (13) altimeter readings shall not decrease more than 2,000 feet in 5 minutes. If it does, go to task 8-1.14. Shut off vacuum pressure. Tester (13) altimeter readings shall not decrease more than 2,000 feet in 5 minutes. If it does, go to task 8-1.14. FOLLOW-ON MAINTENANCE: TM 55-1520-240-23: Battery Disconnected Electrical Power Off Hydraulic Power Off Electronic Compartment Acoustic Blanket Installed END OF TASK Change 4 8-9

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