Emergency Operation In Clouds; Vacuum System Failure; Emergency Descent Through Clouds - Cessna T206H Flight Manual

SOLOY TURBINE PAC
POHS CESSNA T206H/206H

EMERGENCY OPERATION IN CLOUDS

VACUUM SYSTEM FAILURE

In the event of a total vacuum system failure, loss of both vacuum
pumps during flight, the directional indicator and attitude indicator will
be disabled, and the pilot will have to rely on the turn coordinator or
the turn and bank indicator if he inadvertently flies into clouds. The
following instructions assume that only the electrically powered turn
coordinator or the turn and bank indicator is operative, and that the
pilot is not completely proficient in instrument flying.
EXECUTING A 180 TURN IN CLOUDS
Upon inadvertently entering the clouds, an immediate plan should be
made to turn back as follows:
1. Note the compass heading.
2. Note the time of the minute hand and observe the position of the
sweep second hand on the clock.
3. When the sweep second hand indicates the nearest half-minute,
initiate a standard rate left turn, holding the turn coordinator
symbolic airplane wing opposite the lower left index mark for 60
seconds. Then roll back to level flight by leveling the miniature
airplane.
4. Check accuracy of the turn by observing the compass heading
which should be the reciprocal of the original heading.
5. If necessary, adjust heading primarily with skidding motions
rather than rolling motions so that the compass will read more
accurately.
6.
Maintain altitude and airspeed by cautious application of elevator
control. Avoid overcontrolling by keeping hands off the control
wheel as much as possible and steering only with rudder.

EMERGENCY DESCENT THROUGH CLOUDS

If conditions preclude re-establishment of VFR flight by a 180 turn, a
descent through a cloud deck to VFR conditions may be appropriate.
If possible, obtain radio clearance for an emergency descent through
clouds. To guard against a spiral dive, choose an easterly or westerly
heading to minimize compass card swings due to changing bank
angles.
In addition, keep hands off the control wheel and steer a straight
course with rudder control by monitoring the turn coordinator.
Occasionally check the compass heading and make minor corrections
to hold an approximate course.
F.A.A. Approved
EMERGENCY PROCEDURES
3-17
SECTION 3
May 23, 2003