Airplane Flight Manual Supplement

Hawker Beechcraft C90A and C90GT King Air 190-00682-02 Rev. C
Page 40 of 95
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.
¾ IF BOTH SIDES
1. Airspeed and Attitude...................................................... MONITOR using standby indicators
2. Land as soon as practical
¾ IF ONE SIDE ONLY
1. Affected PFD SENSOR Softkey.....................................................................................PRESS
2. ADC Softkey............................................PRESS the ADC softkey to select the opposite ADC
3. Both PFDs............................................................................ CONFIRM “BOTH ON ADC1” OR
“BOTH ON ADC 2” annunciated on both PFDs.
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 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