INTERMEDIATE FLIGHT PREPARATION WORKBOOK
EADI of approximately 3º nose low. Descend at a rate required for the penetration being
performed. At approximately 1000 feet above level off altitude, reduce drag as necessary in
preparation for level-off.
Idle power, speed brakes extended. Above 24,800 feet, establish IMN of 0.78. Below 24,800
feet, establish IAS of 330 KIAS.
Time to descend and fuel to descend increase at temperatures below ISA, and decrease at
temperatures above ISA. For every 10º C below ISA increase time and fuel to descend by 3.5%.
For every 10º C above ISA, decrease time and fuel to descend by 1.5%. The affects of
temperatures on distance to descend are negligible.
When descending with anti-ice, time and distance to descend may increase by as much as 50%
and fuel consumed may increase by as much as 350% depending on ice accumulation. Maintain
approximately 70% N2 when descending with anti-ice systems on.
H106. LANDING WITH WIND GRADIENT OR WIND SHEAR
Wind velocity is generally higher a short distance above the runway than it is on the runway
itself. Entering this wind gradient during the landing approach could result in a change in
airspeed which requires correction.
When landing with a headwind, more thrust is required to maintain a desired glidepath than is
necessary with no wind. Also, the decreasing magnitude of the headwind in the gradient can
cause a decrease in airspeed, which has to be counteracted with the use of additional thrust to
prevent a possible short landing. With a tailwind during the landing approach, the proper
glideslope is maintained with a lower thrust setting and since the magnitude of the tailwind is
decreasing during penetration of the wind gradient, airspeed may have a tendency to increase,
requiring a reduction in thrust. If these corrective measures are not taken, there is a possibility of
overshooting the runway, necessitating a go-around.
The effect of crosswind will also be considered during the landing approach. As the aircraft
approaches the runway, less correction for crosswind may be required to maintain the proper
The degree of corrective action necessary during an approach is dependent upon the severity of
the wind gradient. With a sharp gradient, the change in airspeed could be very rapid, requiring
an immediate correction. The combination of wind gradient, plus wind that is intermittent or
variable in direction and/or speed, requires caution always be exercised during the landing
H-8 T-1A PERFORMANCE MANUAL EXTRACTS