TM55-4920-432-13&P
4-21 AIRSPEED SHUT-OFF VALVE
4-21
THIS TASK COVERS: REMOVAL AND INSTALLATION
Initial Set-Up:
68F Aircraft Electrician or
Personnel Required:
35H, Calibration and Repair Specialist.
Tools and Equipment:
Tool kit, (B2) or Shop Set (B4)
Material/Parts:
Airspeed shut-off valve
Equipment Condition:
Power disconnected, control panel open
1.
REMOVAL:
a.
Remove screw (1) from end of knob (2), loosen two allen screws mounted on side of knob, remove
knob from valve (5).
b.
Remove mounting screws (3) from panel (4).
c.
Disconnect hoses from valve fitting (6 & 7).
d.
Remove elbow fittings (6) from valve.
e.
Remove tee fitting (7) from valve.
2.
INSTALLATION:
a.
Apply tape (D9) to elbow & tee fitting threads (6 & 7).
b.
Install fittings into valve.
c.
Install rubber hose to elbow fitting.
d.
Position valve (5) into panel (4) per note and secure with four screws (3).
e.
Place knob (2) on valve stem and orient to panel and stem position. Tighten two allen screws to
valve stem flats.
f.
Install screw (1) through knob to valve stem.
g.
Install rubber hoses back to their respective location, If needed use pneumatic system diagram fig.
C-4.
Performance check (para. 2-5)
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