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 compartment smoke detection powered by DC bus 1 and DC bus 2
- Cargo compartment fire extinguishing powered by the hot battery bus.
- The fire warning bell sounds.
- Both master FIRE WARN lights illuminate.
- The FWD/AFT cargo fire warning light(s) illuminates.
