Aerospool WT9 Dynamic LSA / Club, Pilot Operating Handbook

Page: 60 / 204

Page 3-20 EASA Approved Initial issue
3.10 Inadvertent Icing Encounter
a. CARBUR. PREHEATING OPEN (pull to open)
b. Icing area
Leave - turn back or change altitude to obtain an outside air temperature that is
less conducive to icing
c. CABIN HEATING OPEN (pull to open)
d. THROTTLE
Increase engine speed to minimize ice build-up on the propeller blades;
if excessive vibration is noted, immediately reduce engine speed to idle,
and then rapidly apply full throttle
e.
Manifold pressure
indicator Check - a loss of manifold pressure could be caused by ice blocking the air intake
filter
f. THROTTLE As required to hold manifold pressure
g. Control surfaces Continue move to maintain their movability
h. Landing planning
Plan a landing at the nearest airport; with an extremely rapid ice build-up, select
a suitable off airfield landing site
i. Wing flaps
Leave FLAPS 0 ; 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
j. Windshield
Open left window and, if practical, scrape ice from a portion of the windshield
for visibility in the landing approach
k. Approach Perform approach using a forward slip, if necessary, for improved visibility
l. Airspeed 130 to 140 IAS / 70 to 76 KIAS depending upon the amount of ice accumulation.
m. Landing Perform in level attitude
WARNING
Flights in icing conditions are prohibited!
If icing is formed on the wing leading edge, expect false indication
of the airspeed, altitude, vertical speed and stall warning system!
CAUTION
With an ice accumulation of 6.4 mm / 0.25 inch or more on the
wing leading edges, expect significantly higher power
requirements, higher approach and stall airspeeds, increased
vibration, worse climb characteristics and a longer landing roll.
Missed approaches should be avoided whenever possible!
NOTE
When using the carburetor preheating, engine power will decrease
due to hot air suction from the heat exchanger.