Airplane Flight Manual Supplement

Hawker Beechcraft C90A and C90GT King Air 190-00682-02 Rev. D
Page 52 of 117
NOTE
The magnetic compass is erratic when either windshield anti-ice, air conditioner, or electric
heat is on. With windshield anti-ice OFF, windshield may form fog or frost on the inside
surface. The windshield anti-ice should be turned off only long enough to reference magnetic
compass or the pilot should descent to a warmer altitude if terrain, fuel, and endurance
permit.
3. ELEC HEAT ................................................................................................................................OFF
4. CABIN TEMP MODE switch .......................................................................................................OFF
5. Heading.................................................................................... MONITOR using magnetic compass
6. Land as soon as practical
NOTE
• The autopilot will disconnect and will not re-engage.
• Reference the GPS track on MFD/PFD map to improve situational awareness. GPS will
continue to display correct GPS based map, position, and track.
• Magnetic compass is influenced by windshield anti-ice, air conditioner, and electric heat.
These items must be turned OFF prior to referencing magnetic compass heading. Leave
these items OFF when maneuvering the aircraft by reference to the magnetic compass.
In Flight, If One Side Only:
1. Standby Attitude Gyro.......................................................................................................MONITOR
2. Affected PFD SENSOR softkey .............................................................................................PRESS
3. AHRS softkey..........................................................................PRESS Opposite Side AHRS softkey
4. Both PFDs...................................CONFIRM VALID ATTITUDE AND HEADING ARE DISPLAYED
CONFIRM “BOTH ON AHRS1” or
“BOTH ON AHRS2” annunciated on both PFDs
NOTE
The autopilot will disconnect and will not re-engage.