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1 APU BOTTLE DISCHARGE Switch
2 APU FIRE Light
3 APU FIRE BOTTLE ARMED Light
4 APU BOTTLE DISCHARGED Light
5 APU FIRE SHUTDOWN Switch
787 Flight Crew Operations Manual
Fire Protection -
Controls and Indicators
8.10.6 Boeing Proprietary
Intentionally
Blank
787 Flight Crew Operations Manual
Fire Protection Chapter 8
System Description Section 20
Boeing Proprietary 8.20.1
8.20 Fire Protection-System Description Introduction
There are fire detection and extinguishing systems for the:
• APU
• cargo compartments
• engines
• lavatories.
The engines also have overheat detection systems.
The main gear wheel wells have a fire detection system, but no fire extinguishing
system.
Refer to the following chapters for additional information:
• Chapter 2 – Air Systems, for descriptions of equipment smoke
evacuation.
• Chapter 3 – Anti–Ice, Rain, for a description of engine anti–ice system
leak protection.
Engine Fire Protection
Engine fire protection consists of these systems:
• engine fire and overheat detection
• engine fire extinguishing.
Engine Fire and Overheat Detection
There are multiple dual-channel detector assemblies in each engine nacelle. Each
detector channel provides both fire and overheat detection. Normally, at least one
element on each channel must detect a fire or overheat condition to cause an
engine fire warning or overheat caution.
If a fault is detected in one channel, the remaining channel element automatically
switches to single channel operation. If the operating channel senses a fire or
overheat, the system provides the appropriate fire warning or overheat caution.
If both main engine detector elements on a single assembly are faulted, no fire or
overheat detection is provided. The EICAS advisory message DET FIRE ENG (L
or R) is displayed if the engine fire detection system fails.
Turbine overheat detection is provided in addition to engine fire and engine
overheat detection. A turbine overheat event is annunciated with the same flight
deck indications as an engine fire (FIRE ENG L, R).
787 Flight Crew Operations Manual
Fire Protection -
System Description
8.20.2 Boeing Proprietary
Engine Fire Warning
The indications of an engine fire are:
• the fire bell sounds
• the master WARNING lights illuminate
• the EICAS warning message FIRE ENG (L or R) is displayed
• the engine fire switch LEFT or RIGHT fire warning light illuminates
• the engine fire switch unlocks
• the engine FUEL CONTROL (L or R) switch fire warning light
illuminates.
Engine Overheat Caution
The indications of an engine overheat are:
• the caution beeper sounds
• the master CAUTION lights illuminate
• the EICAS caution message OVERHEAT ENG (L or R) is displayed.
Engine Fire Extinguishing
There are two engine fire extinguisher bottles. Either or both bottles can be
discharged into either engine.
1
FIRE
EXT
2
FIRE
SQUIB EXT
DISCH DISCH
1 2 1 2
LEFT
RIGHT
ENG BTL
1 DISCH
ENG BTL
2 DISCH
ENGINE FIRE EXTINGUISHING DIAGRAM
787 Flight Crew Operations Manual
Fire Protection -
System Description
Boeing Proprietary 8.20.3
When the engine fire switch is pulled out, rotating the fire switch in either
direction discharges a single extinguisher bottle into the associated engine.
Rotating the engine fire switch in the other direction discharges the remaining
extinguisher bottle into the same engine.
If an extinguisher bottle is discharged or has low pressure:
• the ENG BTL (1 or 2) DISCH light illuminates
• the EICAS advisory message BOTTLE (1 or 2) DISCH ENG is
displayed.
APU Fire Protection
APU fire protection consists of these systems:
• APU fire detection
• APU fire extinguishing.
APU Fire Detection
The APU compartment has dual fire detector loops. There is no APU overheat
detection.
Normally, both loops must detect a fire to produce a fire warning. An APU fire
warning automatically shuts down the APU.
If a fault is detected in one loop, the system automatically switches to single loop
operation. If the operating loop detects a fire, an APU fire warning occurs and the
APU shuts down.
The EICAS advisory message DET FIRE APU is displayed if the APU fire
detection system fails.
APU Fire Warning
The indications of an APU fire warning are:
• the fire bell sounds
• the master WARNING lights illuminate
　
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