OPERATIONS MANUAL

Fire Protection
Valve Test:
The valve test is a function of the freighter system only.
Test switch
(FIRE/OVHT TEST switch if GE or PW engines are
installed, else ENG/APU/CARGO switch.)
The valve test is disabled when the aircraft is in flight.
Push & hold
(momentary action) Keep the test switch pressed for at
least 20 seconds to initiate the valve test program. The
program will check all main deck cargo shutoff valves
and the pack dump valves. The valves are used when the
main deck fire suppression system reconfigures the air
conditioning and starts depressurizing the cabin.
For valve test EICAS messages refer to the next page.
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