Textron Cessna Grand Caravan Ex 208B Pilot's Operating Handbook And Faa Approved Airplane Flight Manual page 184

SECTION 3
ABNORMAL PROCEDURES
AVIONICS/AUTOPILOT
AMBER ALT MISCOMP MESSAGE COMES ON
IF PILOT PFD AND STANDBY ALTIMETER AGREE (COPILOT
PFD STILL DIFFERS)
6. Compare indicated altitude to GPS altitude on MFD AUX-
GPS STATUS page to aid in determining which primary
system is most accurate.
•
When comparing indicated altitude to GPS altitude,
deviations from standard temperature or pressure can
cause indicated altitude to deviate from GPS altitude.
These errors are largest at high altitude and can amount
to over 2,500 feet under some conditions. However,
below 10,000 feet with the correct local altimeter setting
set, GPS altitude will usually be within 600 feet or better
of the correct indicated altitude. Use the following
guidelines to help estimate correct altitude for non-
standard conditions:
•
Temperatures WARMER than standard can cause GPS
altitude to read HIGHER than indicated altitude.
•
Pressures LOWER than standard can cause GPS
altitude to read HIGHER than indicated altitude.
IF ABLE TO IDENTIFY ACCURATE ALTITUDE SOURCE
7. Use SENSOR reversion to select most accurate ADC on
both PFDs.
8. Land as soon as practical.
3-68
(Continued)
NOTE
U.S.
CESSNA
MODEL 208B 867 SHP
GARMIN G1000
(Continued)
FAA APPROVED
208BPHCUS-01