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TM 5-4210-233-14&P-1
Table 4-2 Unit Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
FIREFIGHTING SYSTEM - Continued
11
AIR OPERATED VALVE (FOR AERIAL DISCHARGE) FAILS TO OPEN OR CLOSE
Step 1. Check position of battery switch.
Rotate battery selector switch to 1, 2 or BOTH.
Step 2. Check that air system is pressurized.
Start engine to pressurize system.
Step 3. Check for air leaking from valve or motor connections.
Tighten connections.
Step 4. Refer to electrical system troubleshooting.
If valve fails to operate, replace or repair air operated valve (para 4-199) or pneumatic
actuator (para 4-200).
12
VALVES LEAKING WATER/AGENT
Step 1. Check that valves are closed.
Close valve.
Step 2. Check for internal valve failure.
Refer to Direct support maintenance level.
13
WATER/AGENT REMAINS IN PIPING AFTER DRAIN OPENED
Step 1. Check for clogged drain valve outlet.
Clean dirt/blockage from drain hole.
Step 2. Check for water frozen in piping or drain valve.
Apply heat to piping and drain valve.
Step 3. Check for defective drain valve or linkage.
Refer to Direct support maintenance level.
4-56
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