Pilots Operating Handbook
21/76
YL-MFG
Revision 7, Issue 1
4/6/2016
INADVERTENT ICING ENCOUNTER DURING FLIGHT
WARNING: Use emergency landing with BRS activation whenever crash is imminent.
1. Turn back or change altitude to exit icing conditions. Consider lateral or vertical flight path
reversal to return to last „known good“ flight conditions (to obtain an outside air temperature that
is less conducive to icing). Maintain VFR flight.
WARNING: Failure to act quickly may result in an unrecoverable icing encounter.
2. CABIN HEAT Control Knob - ON (pull full out)
3. A/P DISC/CWS (if installed) - PRESS (verify autopilot disengages and aural alert is heard)
WARNING: Do not engage autopilot with visible ice on airframe or after encountering
icing conditions.
4. Watch for signs of induction air filter icing. Adjust the throttle as necessary to hold engine RPM.
5. Watch for ice accretion on Pitot tube and signs of pitot-static icing. Airspeed and altimeter
indications may become unreliable.
a. Attitude and Heading information will remain reliable in event of airspeed and altimeter failure.
Use attitude indicator to monitor pitch and bank.
b. Reference GS (ground speed) in conjunction with GPS derived wind information to determine
an approximate airspeed.
c. Navigate using Heading Strip, Lateral Deviation, and GPS moving map.
NOTE: GPS information is not as accurate as barometric data but will provide an approximate
value for comparison to pitot-static instruments or a back-u if barometric instruments become
unreliable.
6.
Plan a landing at the nearest airport. With an extremely rapid ice build-up, select a suitable
off airport landing site.
7.
With an ice accumulation of 5 mm or more on the wing leading edges, be prepared for
significantly higher power requirements, higher approach and stall speeds, and a longer
landing roll. Gently pitch and yaw the airplane periodically to keep ice bridging on the
controls to a minimum.
8.
Leave wing flaps retracted. With a severe ice build-up on the horizontal tail, the change in
wing wake airflow direction caused by wing flap extension could result in a loss of elevator
effectiveness.
9.
Perform a landing approach using a forward slip, if necessary, for improved visibility.
10.
Approach at 65 – 70 Kts (120 - 130 km/h) IAS depending upon the amount of ice
accumulation.
11.
Perform landing in level attitude.
12.
Go around should be avoided whenever possible because of severely reduced climb
Capability.
