Selkirk College IATPL Program Manual
Beech 95 POH
Effective September 1, 2005
Appendix 14 - 35
The term Vgo
–
for “Go Speed” is used in the ASD and AGD charts. This is the
speed below which the pilot is expected to reject the takeoff in the event of an engine
failure. At or above Vgo the pilot is assumed to continue the takeoff and perform the
engine failure drill (commonly called the CAPDIF drill.)
It is imperative that pilots recognize that the validity of the Vgo chart depends
upon correct rotation rate on takeoff. It is assumed that the pilot will start a slow, smooth
rotation at Vr so that the airplane accelerates continuously to, but not beyond Vy. If such
a procedure is followed the airplane will be approximately 35 feet agl at 89 KIAS and
will be accelerating. Obviously a pilot may inadvertently or intentionally rotate much
more rapidly than described here. In such a case the airplane may be much more than 35
feet agl upon reaching 89 KIAS. It is possible to
trade altitude for airspeed
, therefore it
may be possible to continue the takeoff below 89 KIAS in such a case, but it is
impossible to provide specific calculated guidance. A pilot facing such a “snap decision”
could easily make the wrong decision. Pilots planning an unusual rotation rate, such as on
a takeoff with a strong crosswind, are advised to consider switching from a planned Vgo
speed to a planned “go altitude” or some other suitable method of deciding when to
continue or reject a takeoff following an engine failure. (Note that the same situation
exists when practicing short field takeoffs on a runway that is long and unobstructed.)
The Accelerate go chart is based on the normal takeoff distance to 35 feet agl
(charts on pages 6-2 and 6-3.) The airplane is assumed to be at 89 KIAS with the gear
down. An engine failure then occurs and the airplane is assumed to perform as per the
Single Engine Emergency Rate of Climb chart (page 6-9) with gear down and propeller
windmilling, for 20 seconds. After 20 seconds it is assumed that the pilot will have
retracted the gear and feathered the propeller and performance is then based on the same
chart for a climb to 50 feet agl. If the calculation shows that the airplane would strike the
ground or descend to within 15 feet of the ground then the chart distance is grayed out,
meaning that Vgo is not a safe concept in that weight and density altitude combination. In
such cases a pilot must chose a minimum safe altitude (“Go Altitude”), rather than a Vgo
speed, to continue the takeoff. In such cases pilots should consult the Single Engine Rate
of Climb chart and consider all relevant factors and options before taking off.
More detailed discussion of the above considerations, including the option to
reject the takeoff and land straight ahead following an engine failure, can be found in the
FTM/IPM section of this Program Manual.
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