FAA Approved Airplane Flight Manual Supplement

190-00716-03 Rev. 4 Hawker Beechcraft B300 and B300C King Air
FAA APPROVED Page 71 of 173
VDI MISCOMPARE ON BARO VNAV APPROACHES (VDI MISCOMP on PFD)
If a difference in temperature compensated altitudes from the two air data computers differs by
more than 50 feet, an amber VDI MISCOMP annunciation will be displayed on both PFDs.
If a VDI MISCOMP Annunciation is Observed on the PFDs:
1. Altimeter Settings ................................................................. VERIFY both pilot and copilot have the
correct barometric altimeter setting
If VDI MISCOMP Annunciation Persists and Able to Determine Accurate VDI:
2. XFR Button on GMC 710 ...................................................... PRESS AS REQUIRED TO SELECT
ACCURATE VDI SOURCE
3. APR Mode ............................................................................................... RE-SELECT AS DESIRED
If VDI MISCOMP Annunciation Persists and Unable to Determine Accurate VDI:
2. Do not use the VDI for vertical guidance information. Approach may be continued to LNAV only
minima.
LOSS OF RADIO TUNING FUNCTIONS
1. COM Frequency Toggle Button ........................................... PRESS AND HOLD FOR 2 SECONDS
NOTE
The above procedure will tune the active COM field to the emergency frequency 121.5.
Certain failures of the tuning system will automatically tune 121.5 without pilot action.
If the EMERG FREQ switch is installed, the following alternate procedure may be used:
1. EMERG FREQ switch ............................................................................. LIFT COVER AND PRESS
NOTE
The above procedure will tune the active COM 1 field to the emergency frequency 121.5.
COM 2 operation is not controlled by the EMERG FREQ switch.