ICE FORMATION DETERMINATION
Typically, ice will accumulate more efciently on a leading edge with a
small radius than on a leading edge with a large radius. With relatively
small leading edge radii, the wing strut and ap tracks are good locations
to monitor for ice build-up, but may not be as visible to the pilot as the wing
leading edges. It is recommended to monitor for ice build-up in the following
areas:
1. Wing Leading Edge
2. Wing Struts
3. Leading Edge of Flap Tracks (unprotected surface)
4. Lower Portion of Windshield
IN-FLIGHT
IF ICING CONDITIONS EXIST
1. ENG INLET Switch .......................................................................... BYPASS
2. Pitot Heat Switches (L&R)
.........................................................................ON
3. WINDSHIELD Switch
............................................................. AS REQUIRED
4. AUX BUS Switch
.......................................................................................ON
5. ECS
.................................INCREASE SET TEMP TO ABOVE CABIN TEMP
6. Defrost
........................................................................................SELECT ON
7. ICE LIGHT Switch
.................................................................. AS REQUIRED
8. Monitor ice accumulation:
At rst sign of ice accretion:
SURFACE/PROP Switch
........................... NORM or HIGH AS REQUIRED
If ice continues to accrete on wing leading edge:
SURFACE/PROP Switch
............................................................ HIGH/MAX
If ice continues to accrete on wing leading edge or does not shed:
BACKUP PUMP Switch
........................................................................... ON
Perform Ice Protection System Failure checklist.
INADVERTENT ICING ENCOUNTER
1. ENG INLET Switch ............................................................ VERIFY BYPASS
2. Pitot Heat Switches (L&R)
...........................................................VERIFY ON
3. SURFACE/PROP Switch
........................................................................ MAX
To initially dissipate ice accumulation, then:
SURFACE/PROP Switch
.....................................................HIGH or NORM
If ice accumulation occurs, then:
SURFACE/PROP Switch
...................................................................... MAX
4. WINDSHIELD Switch
................................................ON (Momentary Switch)
5. AUX BUS Switch
.......................................................................................ON
6. ECS
.................................INCREASE SET TEMP TO ABOVE CABIN TEMP
7. Defrost
........................................................................................SELECT ON
8. Airspeed......................... MAINTAIN 110-168 KIAS and Less than 190 KTAS
If ice does not shed, perform Ice Protection System Failure checklist.