Section X
Safety Information
~ft
Twin Engine (Piston)
All Baron and Travel Air Models - 130 KIAS
All other BEECHCRAFT twin-engine models - 140 KIAS
The pilot must remain aware of the fact that if he allows his
airspeed to deteriorate below this minimum speed, he will
increase the angle of attack of his airplane to the point
where ice may build up on the under side of the wings aft of
the area protected by the boots.
The fact or extent of ice build-up in unprotected areas will
not be directly observable from the cockpit. Due to distortion
of the wing airfoil, increased drag and reduced lift, stalling
speeds will increase as ice accumulates on the airplane. For
the same reasons, stall warning devices are not accurate
and cannot be relied upon in icing conditions.
Even though the pilot maintains the prescribed minimum
speeds for operating in icing conditions, ice is still likely to
build up on the unprotected areas (the fuselage and unpro-
tected wing leading edge inboard of the engine nacelle).
Under some atmospheric conditions, it may even build up aft
of the boots despite the maintenance of the prescribed rnlnl-
mum speed. The effect of ice accumulation on
any unpro-
tected surface is aggravated by length of exposure to the
icing conditions. Ice buildup on unprotected surfaces will
increase drag, add weight, reduce lift, and generally,
adversely affect the aerodynamic characteristics and perfor-
mance of the airplane. It can progress to the point where the
airplane is no longer capable of flying. Therefore, the pilot
operating even a fUlly-equipped airplane in sustained icing
conditions must remain sensitive to any indication, such as
observed ice accumulation, loss of airspeed, the need for
increased power, reduced rate of climb, or sluggish
response, that ice is accumulating on unprotected surfaces
and that continued flight in these conditions is extremely
hazardous, regardless of the performance of the deicing!
anti-icing equipment.
10·34
May, 1994
To Next Page
Loading...
