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30-
6
REV 56, Jan 31/03
<0039> <0006>
OVBD COOL FAIL status (white)
Comes on duringgroundoperations, if the overboard avionics coolingSOV has failed closedwithpassenger door unlatched(10 secs. time delay).
INBD COOL FAIL status (white)
Inboard avionics coolingSOV not open withthepassenger door closed(10 time delay).
NOTE
The inboard cooling shut-
off valve (INBD COOLSOV) is usedduringflight to flush coolthe avionicssystem equipment. The valve is normally closed on andopenduringflight.
CKPT COOL FAIL status (white)
Avionics coolingSOV not in correct position(closed onground or open duringflight).
COOL EXHAUST FAIL status (white)
Exhaust fan failed or low flow from cooling exhaust (10 secs. time delay).
OVBD COOL caution (amber)
Overboard avionics coolingSOV not closedwith the passenger door and service door closed (10 secs. time delay).
NOTE
The avionics cooling overboard shut-
off valve (OVBDCOOLSOV) is usedduringground operations to flush coolthe avionicssystem and dumphot air overboard.The valve is normally openonthe groundand closedduringflight. The airplanewillnot pressurize to normallevels if the overboard cooling shut-
off valve is failedopen.
DISPLAY COOL caution (amber)
Lowairflowis detectedin cockpit display cooling duct (dueto duct disconnection, duct blockage) or display fan 1or 2, or standby fan has failed (10 secs. time delay).
ARINC COOL caution (amber)
Lowairflowis detectedinARINCunit cooling duct (dueto duct disconnection, duct blockage) or avionics coolingfan 1or 2has failed(10 secs. time delay).
<0039>
<0039>
Status Page
Avionics Cooling ---EICAS Indications <MST>
Figure 08---30---5
Flight Crew Operating Manual MASTER
CSP A-
013
ENVIRONMENTAL CONTROL SYSTEM Vol. 1 08-
30-
7
Avionics Cooling System REV 56, Jan 31/03
Display Overtemperaturewarning (red)
Indicates an approachingthermal shutdown of PFD.
Sky andground raster is
removed(to delay thermal
shutdown).
Display Overtemperaturewarning (red)
Indicates an approachingthermal shutdown of MFD.
Display Overtemperature IndicationsFigure 08---30---6
Flight Crew Operating Manual MASTER
CSP A-
013
ENVIRONMENTAL CONTROL SYSTEM Avionics Cooling System Vol. 1 08-
30-
8
REV 56, Jan 31/03
A. System Circuit Breakers
SYSTEM SUB-
SYSTEM CB NAME BUS BAR CB PANEL CB LOCATION NOTES
Avi niAvio
nic
s
Cooling S g System Display FansDisplay Fans DISPLAY FAN 1 AC ESS 3 C9
DISPLAY FAN 2 AC BUS 1 1 D2
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