Emergency Descent Through Clouds (Dual Ahrs Failure) - Textron Cessna Grand Caravan Ex 208B Pilot's Operating Handbook And Faa Approved Airplane Flight Manual

CESSNA
MODEL 208B 867 SHP
GARMIN G1000
EMERGENCY OPERATION IN CLOUDS
EMERGENCY DESCENT THROUGH CLOUDS (DUAL
AHRS FAILURE)
When returning to VFR flight after a 180° turn is not practical, a descent
through the clouds to VFR conditions below can be appropriate. If
possible, obtain an ATC clearance for an emergency descent through
the clouds.
DUAL AHRS FAILURE
Choose an easterly or westerly heading to minimize non-stabilized
magnetic compass card sensitivity. Occasionally check the compass
heading and make minor corrections to hold an approximate course.
The autopilot will not operate if the AHRS unit fails. The pilot must
manually fly the airplane without AHRS input.
Before descending into the clouds, prepare for a stabilized descent as
follows:
1. Set rudder trim to neutral position.
2. Turn PITOT HEAT switch to the ON position.
3. Set power for a 500 to 800 feet per minute rate of descent.
4. Set the elevator trim for a stabilized descent at 115 KIAS.
5. Use the standby attitude indicator roll pointer and index to keep
wings level.
6. Check trend of compass card movement and make cautious
corrections with rudder to stop the turn.
7. Upon breaking out of clouds, resume normal cruising flight.
FAA APPROVED
208BPHCUS-00
EMERGENCY PROCEDURES
(Continued)
U.S.
SECTION 3
3-47