Cargo Compartment Fire Protection
Cargo fire protection consists of these systems:
Cargo Compartment Smoke Detection
The forward and aft cargo compartments each have smoke detectors in a dual
loop configuration. Normally, both detection loops must sense smoke to cause
an alert.These loops function in the same manner as the engine overheat/fire
detection loops.
Cargo Compartment Fire Warning
The indications of a cargo compartment fire are:
Cargo Compartment Fire Extinguishing
Option - Single cargo fire extinguisher bottle
A single fire extinguisher bottle is installed in the air conditioning mix bay on the
forward wing spar. Detection of a fire in either the forward or aft compartment will
cause the FWD or AFT cargo fire warning light to illuminate. The extinguisher is
armed by pushing the appropriate cargo fire ARMED switch. Once armed, the
system is discharged by pushing the cargo fire DISCH switch. This results in the
total discharge of the bottle contents into the selected compartment. The cargo
fire DISCH light illuminates once the bottle is discharged. It may take up to 30
seconds for the light to illuminate.
Cargo fire protection consists of these systems:
- Cargo compartment smoke detection powered by DC bus 1 and DC bus 2
- Cargo compartment fire extinguishing powered by the hot battery bus.
Cargo Compartment Smoke Detection
The forward and aft cargo compartments each have smoke detectors in a dual
loop configuration. Normally, both detection loops must sense smoke to cause
an alert.These loops function in the same manner as the engine overheat/fire
detection loops.
Cargo Compartment Fire Warning
The indications of a cargo compartment fire are:
- The fire warning bell sounds.
- Both master FIRE WARN lights illuminate.
- The FWD/AFT cargo fire warning light(s) illuminates.
Cargo Compartment Fire Extinguishing
Option - Single cargo fire extinguisher bottle
A single fire extinguisher bottle is installed in the air conditioning mix bay on the
forward wing spar. Detection of a fire in either the forward or aft compartment will
cause the FWD or AFT cargo fire warning light to illuminate. The extinguisher is
armed by pushing the appropriate cargo fire ARMED switch. Once armed, the
system is discharged by pushing the cargo fire DISCH switch. This results in the
total discharge of the bottle contents into the selected compartment. The cargo
fire DISCH light illuminates once the bottle is discharged. It may take up to 30
seconds for the light to illuminate.
