MD-11 Flight Crew Operations Manual
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Fire Protection -
Description and Operation
Fire.10.7
The ENG FIRE handles allow the crew to discharge fire agent to an engine from
one of two bottles installed for each engine. Moving the handle to the first position
turns off the generator field. The second position shuts off fuel, hydraulics and
pneumatic supply. The handle can then be rotated clockwise to discharge bottle 1
and counterclockwise for bottle 2. When a fire is extinguished, the handle light
will extinguish, however, the engine FUEL switch will remain illuminated if
FUEL switch is still on.
The APU FIRE handle allows the crew to discharge fire agent to the APU. Pulling
the handle turns off the APU if not already off. The handle can then be rotated
clockwise to activate bottle 1 and counterclockwise for bottle 2. Switches on the
external APU control panel allow discharge from the wheel well area. Normally,
the APU will shutdown automatically if a fire is detected. With the aircraft on the
ground a horn will sound. This horn will stop when the fire signal is no longer
received.
Lower Cargo Fire Detection
The aircraft has class C forward and center/aft lower cargo compartments which
require detection and fire extinguishing provisions. A fabric cargo net separates
the center and aft cargo compartments.
The center and aft compartments are considered a single class C cargo
compartment.
The lower cargo fire detection system consists of photoelectric smoke detectors,
overheat detector, smoke detector annunciation, heat detector annunciation, FWD
and AFT flow DISAG/OFF lights, and CRT displays.
The aircraft has five smoke detectors installed in the forward cargo compartment
and five in the center/aft cargo compartment area.
In addition, one overheat detector is installed in the ventilation exit duct of the
ventilated forward cargo compartment area and two overheat detectors are
installed in the exhaust ducts of the ventilated center/aft cargo compartment area.
Any one of the smoke or overheat detectors will activate the warning system.
Both the forward and aft cargo compartments are ventilated. Ventilation of these
areas is controlled by the FLOW switches on the CARGO FIRE control panel. In
the event of heat or smoke, the HEAT or SMOKE lights on the CARGO FIRE
control panel illuminate and an alert will be displayed.
October 02, 2006
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