Aero Chapter 03, High AOA/Stall/Spin
T-45 Aerodynamics Student Workbook
TWO UPRIGHT SPIN MODES
The two upright modes are 30 degrees true angle of attack and 45 degrees true angle of attack
(Figure 60). Both are above 28 units indicated angle of attack indicating the aircraft is stalled. Airspeed
best differentiates between the spin modes. The differences as described in NATOPS are:
UPRIGHT SPIN MODES (true AOA)
TRUE AOA
+30 degrees
+45 degrees
Indicated AOA
Above 28
30
Airspeed
Increasing through 180
Steady 100-110
Altimeter
Decreasing rapidly
Decreasing rapidly
VSI
> 6,000 fpm descent
> 6,000 fpm descent
Turn needle
In direction of the spin
In direction of the spin
Descent rate
12,000 fpm
15,000 fpm
g’s
Positive
Positive
45
28 Units or More AOA
30 Units AOA
60
Positive G
Positive G
Turn Needle in Direction of Spin
Turn Needle in Direction of Spin
180 KIAS
100 to 110 KIAS
45
1,200 Feet / Turn
1,000 Feet / Turn
30
10 Turns / Minute
15 Turns / Minute
30-DEGREE TRUE AOA SPIN INDICATIONS
45-DEGREE TRUE AOA SPIN INDICATIONS
Figure 60: UPRIGHT SPIN MODES
(7-99) Original
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