4-18. PUMP, PIPING, AND VALVES - Continued
4-18.6 Tank Drain Valve (Manually Operated).
This task covers
Tool Kit, Master Mechanic,
22, Appendix E Pipe Sealant
Water (foam) Tank Drained (see para. 2-13)
All Piping Drained
Main Engine Shutdown (see para. 2-10)
APU Shutdown (see para. 2-12)
Batteries Disconnected (see para. 4-24)
Pump Body and Hose Body Heat Shield Removed
(see para. 4-11)
Disconnect the remote handle from the drain
Remove the gear clamp and drain hose from the
Set the tank drain valve handle (1) in the open
Remove the ball valve (2) from the tank outlet
pipe nipple (3).
Clean the threads of the nipple and the ball valve.
Inspect tank outlet pipe nipple (3) and ball valve (2) for stripped or corroded threads. Replace
Apply pipe sealant (item 22, Appendix E) to the tank outlet pipe nipple (3).
Install the ball valve (2) onto the tank outlet pipe nipple (3) Make sure the ball valve handle is in an
easily accessible position.
Close the tank drain valve before filling the water (foam) tank.
Install drain hose onto the nipple and tighten gear clamp.
Install the remote handle on the drain valve.