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GRUMMAN AMERICAN
FOR TRAINING USE ONLY – SECTION 3
MODEL GA-7/COUGAR
EMERGENCY PROCEDURES
3-30
Issued: April 10, 1978
Maintain a level attitude when landing, using power as required to control rate-of-descent before touchdown. If a
go-around is mandatory, apply maximum power while retracting the flaps in small increments. Retract the landing
gear after any obstacles have been cleared.
CARBURETOR ICING
The formation of ice in the carburetor throat may result at temperatures well above freezing due to the added
cooling caused by evaporation of fuel in the induction system. The formation of carburetor ice causes a gradual
loss of engine power, and my result in eventual engine roughness. To clear the ice, pull the carburetor heat
control full ON. This may cause additional roughness from the melting ice and the richer fuel mixture. After
approximately one minute, return the carburetor heat control to OFF.
If conditions require the continued use of carburetor heat in flight, pull the carburetor heat control full ON and
lean the mixture slightly for smoothest engine operation.
Partial carburetor heat may not clear the ice completely, allowing it to refreeze further down in the induction
system. Always pull the carburetor heat control full ON when icing is encountered.
STATIC SOURCE BLOCKAGE
(ERRONEOUS INSTRUMENT READING SUSPECTED)
If static source blockage is suspected due to erroneous altimeter, airspeed, or vertical velocity indicator, the
alternate static air source should be used.
If an auto pilot is in use, turn the altitude hold function OFF momentarily to avoid abrupt climb or descent as the
static source is changed. Pull the alternate static air source. When using the alternate static air source, make the
following corrections. If the DV window is closed and in cruise flight, subtract 10 KIAS from the indicated airspeed
and 130 feet from the indicated altitude. No correction is needed for climbs or flight with landing gear extended.
If the DV window is open and in cruise flight, subtract 15 KIAS from the indicated airspeed and 210 feet from the
indicated altitude. Subtract 10 KIAS and 100 feet for climbs and flight with landing gear extended. Remember that
opening or closing windows and vents will cause changes in pitch if the autopilot is used.