Altitude Miscompare (Amber Alt Miscomp Indication Pfd) - Cessna Grand Caravan 208B G1000 Manual

SECTION 3
ABNORMAL PROCEDURES
ALTITUDE MISCOMPARE
INDICATION PFD)
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
5. Use SENSOR REVERSION to select most accurate ADC on
both PFDs.
6. Land as soon as practical.
IF UNABLE TO IDENTIFY ACCURATE ALTITUDE SOURCE
5. Land as soon as practical. Consider diversion to visual
conditions.
6. Maintain altitudes based on LOWEST indicated altitude.
7. ATC . . . . . . . . . . . ADVISE (of inability to verify correct altitude)
8. If unable to descend into visual conditions, plan ILS approach
with course intercept well outside the Final Approach Fix (FAF).
9. Once glideslope is captured, determine most accurate altitude
source when crossing FAF.
3-54
(Amber
(Continued)
NOTE
(Continued Next Page)
U.S.
CESSNA
MODEL 208B G1000
ALT MISCOMP
FAA APPROVED
208BPHBUS-01