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APU
HOLD 5
1
4
5
2
3
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
8.10.6 D6-30151-425
Fire Protection -
Controls and Indicators
Illuminated (red) –
• fire in APU compartment, or
• the Fire/Overheat Test switch is pushed
5 APU FIRE CONTROL Switch
Pull down -
• shuts down APU
• arms APU fire extinguisher
December 01, 1999
747 Operations Manual
Fire Protection Chapter 8
System Description Section 20
Copyright © The Boeing Company. See title page for details.
D6-30151-425 8.20.1
Introduction
There are fire detection and extinguishing systems for the:
• APU
• cargo compartments
• engines
• lavatories
The crew rest compartments and main gear wheel wells have fire detection
systems, but no fire extinguishing systems.
The engines also have overheat detection systems.
Refer to the following chapters for additional information:
• Chapter 2 – Air Systems, for descriptions of equipment smoke evacuation,
and bleed duct leak and overheat detection.
• Chapter 3 – Anti–Ice, Rain, for a description of engine anti–ice system
protection.
Fire Warnings
If a fire is detected, the flight deck warning bell rings one second on, then 10
seconds off. If an APU fire occurs on the ground, the APU fire warning horn also
sounds on the APU ground control panel in the right body gear wheel well.
The fire bell (and wheel well horn for APU fire) can be silenced by any of the
following actions
• extinguishing the fire
• pushing either Master Warning/Caution Reset switch (wheel well horn
continues to sound).
• pulling the APU Fire Control switch in the right wheel well
In addition to the aural warning, an EICAS FIRE message is displayed as long as
the fire condition exists.
The following lights illuminate if a fire is detected and remain illuminated as long
as the fire signal exists:
• both Master Warning lights (may be reset while fire signal exists)
• related Engine, APU, or Cargo Fire Warning lights
• for an engine fire, related Fuel Control switch Fire light.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
8.20.2 D6-30151-425
Fire Protection -
System Description
Overheat Cautions
If an engine overheat condition is detected, the caution beeper sounds, the Master
Caution lights illuminate, and an EICAS overheat message displays.
Fire/Overheat Detection
Engine Fire/Overheat Detection
A dual loop fire detector is installed in each engine nacelle. In addition, each
engine has a dual loop overheat detector. In normal operation, both loops in a
detector must detect a fire or overheat condition to cause an engine fire warning or
overheat caution unless configured for single loop operation.
APU Fire/Overheat Detection
A dual loop fire detector is installed in the APU compartment. There is no
overheat detection in the APU compartment. Either loop detecting a fire activates
an APU fire warning which shuts down the APU and, on the ground, discharges
the APU fire extinguisher bottle.
Cargo Compartment Fire Detection
The forward and aft cargo compartments each have two dual loop smoke
detectors. Sample air from throughout each compartment is drawn through the
detectors. Both loops in a detector must sense smoke to activate the cargo fire
warning unless reconfigured for single loop operation.
WheelWell Fire Detection
Each main gear wheel well has a single loop detector.
Crew Rest Smoke Detection
Smoke detectors are installed in crew rest areas. An aural warning sounds in the
crew rest compartment when smoke is detected in that compartment.
Lavatory Smoke Detection
Smoke detectors are installed in the lavatories. An aural warning sounds in a
lavatory when smoke is detected in that lavatory. An automatic fire extinguisher is
located in the waste compartment in each lavatory.
December 01, 1999
747 Operations Manual
Fire Protection -
System Description
Copyright © The Boeing Company. See title page for details.
D6-30151-425 8.20.3
Fire Extinguishing
Engine Fire Extinguishing
There are two fire extinguisher bottles in each wing for the two engines on that
wing. One or both bottles can be discharged in either engine on a wing.
The Engine Fire switches are mechanically locked in. If an engine fire occurs, the
related switch is electrically unlocked and can be pulled out.
　
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