MD-11 Flight Crew Operations Manual
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Fire Protection -
Description and Operation
Fire.10.5
Fire Indications
A main engine fire or overheat condition is indicated by:
• Illumination of MASTER WARNING lights.
• Sounding of fire bell.
• Illumination of ENG FIRE handle.
• Illumination of engine FUEL switch.
• Alert on the EAD.
The red MASTER WARNING light, located on both the Captain's and First
Officer's glareshield, is actuated by the relays of the FDCU. This light is a
push-to-reset light used to turn the aural warning and MASTER WARNING light
off after a fire warning. This enables the system to indicate another warning if
necessary.
A red light in the ENG FIRE handle and the associated alert on the EAD will
indicate which ENG FIRE handle to pull for fire extinguishing. A red light in the
engine FUEL switch indicates which engine FUEL switch to turn off. With the
ENG FIRE handle pulled and the engine FUEL switch on or off, the FUEL switch
remains illuminated if the fire warning still exists.
With the ENG FIRE handle pulled and the fire warning terminated, the engine
FUEL switch will remain illuminated until the FUEL switch is moved to the OFF
position.
An APU fire or overheat condition is indicated by:
• Illumination of MASTER WARNING lights.
• EAD alert.
• Aural warning in cockpit.
• Illumination of APU FIRE light on the external APU control panel.
• Illumination of APU FIRE handle on the APU control panel.
• Sounding of horn near the external APU control panel.
LOOP A LOOP B ALERT
Fire Fire ENGINE (1,2,3, or APU) FIRE
Fire Normal FIRE DET (1,2,3, or APU) FAULT
Normal Fire FIRE DET (1,2,3, or APU) FAULT
Fire Fault ENGINE (1,2,3, or APU) FIRE
Fault Fire ENGINE (1,2,3, or APU) FIRE
Fault Fault ENGINE (1,2,3, or APU) FIRE (if both loops were good before
control unit detected dual fault within 5 seconds.
Fault Fault FIRE DET (1,2,3,or APU) FAIL (if control unit detects dual fault
occurred outside 5 seconds.
October 02, 2006
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