System Maintenance Manual

G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air Page 8-5
190-00682-01 Revision F
8.1.4 G1000 Cooling Fan Fail Annunciation Check
Do the following to verify the cooling fans and annunciations are functioning properly
Step Desired Result
Cooling Fan Failure Conditions:
1. Ensure the G1000 is in normal mode and
verify that there are no fan related alert
messages displayed in the PFD 1 or
PFD 2 Alerts Window.
2. Pull the following cooling fan circuit
breakers:
a) PFD/GIA FANS LEFT
b) PFD/GIA FANS RIGHT
c) MFD FAN
Verify that the following alert messages are
displayed:
• AVN FAN 1 FAIL – Avionics cooling fan #1 is
inoperative
• AVN FAN 2 FAIL – Avionics cooling fan #2 is
inoperative
• PFD 1 FAN FAIL – PFD #1 cooling fan is
inoperative
• PFD 2 FAN FAIL – PFD #2 cooling fan is
inoperative
• MFD FAN FAIL – MFD cooling fan is inoperative
Fan Failure reset and acknowledgement:
1. Reset all cooling fan circuit breakers.
2. Acknowledge alerts by pressing the
ALERTS softkey on PFD1.
Verify the above alerts extinguish.
8.1.5 Standby Instrument Electrical Power Checks
This section tests the standby electrical power for the standby attitude indicator, the standby altimeter and
the standby airspeed indicator. The magnetic compass is tested in each Phase inspection during the
cockpit lights check, (item 33 of the operational inspections) in the King Air Model 90 Series
Maintenance Manual, listed in Table 1-2.
Step Desired Result
1. Remove or ensure external aircraft power
is removed. Set main battery switch to
OFF.
2. Ensure the STBY ATT and STBY ALTM
circuit breakers are closed.
3. Ensure the MASTER PANEL LIGHTS
rocker switch in the overhead panel is in
the ON position.
4. Ensure the STBY INSTR knob is turned to
full bright.
Verify the STANDBY BATTERY annunciator/switch
is not illuminated