OPERATIONS MANUAL

Fire Protection
Cargo Fire Control
on Freighter:
Main deck arm switch
ARMED Arms the main deck fire suppression
and reconfigures the air conditioning:
• Shuts down two packs.
• Sets equipment cooling to closed loop.
• Stops all airflow to the main and lower
decks.
• Deactivates all cargo heat.
blank Sets normal configuration.
MAIN
DECK
LIGHT
A fire is detected on the main deck, or
the fire detection test is running and the
detectors are operative.
Discharge switch
If FWD or AFT is armed:
Push (momentary action) Discharges
the A and B bottles into the
armed lower compartment.
After 30 minutes, or upon
touchdown, the other armed
bottles will discharge (normally,
the schedule varies by airline; the
simulator applies this schedule
on all aircraft).
DISCH
LIGHT
Discharge schedule is started.
Depressurize switch
If MAIN is armed:
Push (momentary
action) Raises the
cabin altitude to
25000 ft.
DE-
PRESS
LIGHT
Depressurization
is started.
Forward arm switch
ARMED Arms the lower forward cargo
fire extinguisher squibs and
reconfigures the air conditioning:
• Shuts down two packs.
• Stops all airflow to the lower
deck.
• Sets the equipment cooling
system to override mode.
• Deactivates all cargo heat.
blank Sets normal configuration.
FWD
LIGHT
A fire is detected in the lower
forward cargo compartment, or
the fire detection test is running
and the detectors are operative.
Aft arm switch
ARMED Arms the lower aft cargo
fire extinguisher squibs and
reconfigures the air conditioning:
• Shuts down two packs.
• Stops all airflow to the lower
deck.
• Sets the equipment cooling
system to override mode.
• Deactivates all cargo heat.
blank Sets normal configuration.
AFT
LIGHT
A fire is detected in the lower aft
cargo compartment, or the fire
detection test is running and the
detectors are operative.
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