Descent - P-8670077

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STUDENT GUIDE
T-39 FLIGHT PREPARATION
(3)  Anti-Ice: The operation of anti-ice systems will result in reduced range. The
specific effects on cruise performance will depend on the selected range cruise thrust
setting.
5.
DESCENT
a. Normal Descent
.65 Mach or 300 knots IAS, speed brake closed. Above 22,000 feet establish aircraft rate
of descent at 1100 ft/min. Below 22,000 feet establish aircraft rate of descent at 5500 ft/min
with idle thrust.
b. Emergency Descent
Used idle thrust, speed brake open. Descend at .77 indicated Mach number or 325 knots
IAS, whichever is less.
c. Zero Thrust Descent
Speed brake closed, 170 Knots IAS. At 170 Knots, the glide ratio is about 12.5 to 1
which equates to a glide of about 21 nm for every 10,000 feet of altitude. (Gear down cuts
the range in half)
6.
APPROACH AND LANDING
·
Maximum Landing Weight ­ 17,500 Lbs
·
Single Engine Landing ­ Add 10 Kts to VREF
·
No Flap Landing ­ Add 10 Kts to VREF
·
Slats Inop ­ Add 15 Kts to VREF
·
Landing Distance Considerations (flaps down / optimum braking / speed brake
closed/anti-skid on)
For each 5 Knots above recommended touchdown speed, increase ground roll by
10%.
Speed brake open will decrease distance by 6%
For anti-skid inoperative increase distance by 26%
There is no allowance for thrust reverser operation
RCR is a measure of tire to runway friction coefficient. RCR is given as a whole
number. Values vary from 26 (maximum friction coefficient) to 2 (minimum friction
coefficient). This value is used to define the braking characteristics for various runway
G-7

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