4-18. PUMP, PIPING, AND VALVES-Continued
4-18.14 Foam Check Valve.
This task covers
Tool Kit, Master Mechanic,
All Piping Drained
Main Engine Shutdown (see para. 2-10)
APU Shutdown (see para. 2-12)
Batteries Disconnected (see para. 4-24)
Pump Body Heat Shield Removed (see para. 4-11.2)
22, Appendix E Pipe Sealant
92-105" Check Valve
Open compartment door (A) and remove all equipment.
Remove the box rear plate (B).
Remove the foam supply hose (1) and nipple (2).
Remove the check valve (3) from the elbow (4).
Apply pipe sealant (item 22, Appendix E) to threads and
install check valve (3) onto elbow (4). Ensure the check
valve is installed so the flap is vertical and the flap pivot
Apply pipe sealant (item 22, Appendix E) to the
threads and install nipple (2).
Install and tighten foam supply hose (1) to the nipple
Replace box rear plate (B).
Install equipment in compartment box.
Start firefighting foam system as detailed in para. 2-
11. Tighten/remake any leaking connections.