Airplane Flight Manual Supplement

190-00682-02 Rev. D Hawker Beechcraft C90A and C90GT King Air
Page 51 of 117
FAILED AIRSPEED, ALTITUDE, AND/OR VERTICAL SPEED
(RED "X" ON PFD AIRSPEED, ALTITUDE, AND/OR VERTICAL SPEED
INDICATORS)
This indicates a loss of valid air data computer information to the respective system.
If Both Sides:
1. Airspeed and Attitude...................................................... MONITOR using standby indicators
2. Land as soon as practical
If One Side Only:
1. Autopilot ALT Mode............................................................................................DISENGAGED
2. Affected PFD SENSOR Softkey.....................................................................................PRESS
3. ADC Softkey..............PRESS the ADC softkey to select the functional ADC (ADC1 or ADC2)
4. Both PFDs............................................................................ CONFIRM “BOTH ON ADC1” OR
“BOTH ON ADC 2” annunciated on both PFDs.
5. Autopilot ALT Mode .........................................................................RESELECT AS DESIRED
FAILED ATTITUDE AND/OR HEADING
(ATTITUDE FAIL AND/OR RED "X" OVER HEADING DISPLAY ON PFD)
This indicates a loss of pitch, roll, and/or heading information from AHRS. Refer to GARMIN
G1000 Cockpit Reference Guide and Pilot’s Guide for additional information. Interference from
GPS repeaters operating inside nearby hangars or magnetic anomalies caused by nearby
structures can cause an intermittent loss of attitude and heading displays while the aircraft is on
the ground. This is usually accompanied by a BOTH ON GPS 1, BOTH ON GPS 2, or LOI
annunciation. Moving the aircraft more than 100 yards away from the source of the interference
should alleviate the condition.
Taxiing the aircraft before a valid GPS position has been acquired can cause attitude and/or
heading display to indicate a failed condition. As soon as the aircraft acquires a valid GPS
position, attitude and heading should return to normal.
DO NOT TAKE OFF WITHOUT VALID, NORMAL ATTITUDE AND HEADING
DISPLAYS
In Flight, If Both Sides:
1. Attitude .................................................................................MONITOR using standby attitude gyro.
2. WSHLD ANTI-ICE Switches (Pilot and Copilot)..........................................................................OFF
WARNING