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
