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APU FIDEEX CONTROL SCHEMATIC
"APU FIRE"
AUDIO APU LOOP A CONTROL PANEL
HATCH SENSING ELEMENTS
EDUCTOR SENSING
D
ELEMENTS
A IACAPU FIRE U
STRUT SENSING ELEMENTS
APU LOOP B EICAS
APU COMPARTMENT
APU FIRE
HANDLE
FIDEEX CONTROL UNIT
GF0910_019
When a fire is detected, the APU fire warning handle will illuminate, MASTER WARNING lights will illuminate, a warning message will appear on EICAS and a voice message “APU FIRE”will sound.
The APU fire loop elements send their information to the FIDEEX control unit. The FIDEEX control unit in turn sends information to the DAU. The DAU reports the status of the detection system to the IAC which signal the EICAS and audio control panel of the warning condition.
Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2 CSP 700.5000.6 09.10.15
FIRE PROTECTION
APU FIDEEX/FADEC INTERFACE
The fire loop elements inside the APU compartment detect a fire and send this information to the FIDEEX control unit. The FIDEEX control unit in turn sends information to the APU FADEC which commands an APU shut down.
NOTE
If APU fire is detected on the ground and the fire handle signal (pulled) is not detected within 5 seconds, the FADEC will command an auto shut down of the APU.
During normal APU operation, the APU FADEC signals the fuel management system to open the APU SOV. If an APU fire were detected and the APU fire DISCH handle pulled, the FIDEEX control unit will close the APU SOV.
APU FIDEEX/FADEC CONTROL SCHEMATIC
When the APU DISCH fire handle is turned, a command is send to the FIDEEX control unit to discharge the fire bottle. The EICAS will display the result of the extinguisher discharge.
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005 09.10.16 CSP 700.5000.6
MAIN WHEEL WELL (MWW) OVERHEAT DETECTION
The main landing gear bays can be subjected to overheat conditions due to brake/tire overheat or fire. The MWW overheat detection is provided by a single loop system for each main wheel well (left and right); each loop consists of one sensing element. The sensing elements are mounted in the vicinity of the brakes on the top surface of each MWW bin.
The FIDEEX control unit continuously monitors the heat sensing elements in the main landing gear area. Any overheat condition or system fault detected by the monitoring system is annunciated on EICAS in the form of a main landing gear bay overheat warning message, overheat fail caution message or main landing gear bay overheat fault. The gear bay overheat warning message will be accompanied by an aural warning.
OVERHEAT
DETECTOR
"GEAR BAY OVERHEAT"
LEFT MLG AUDIOLEFT MLG CONTROLLOOP PANEL
MAIN LANDING GEAR (MLG) SENSING ELEMENT D
RIGHT MLG A U IAC
RIGHT MLG LOOP EICAS MAIN LANDING GEAR (MLG) SENSING ELEMENT
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