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|  T-34C INSTRUMENTS
CHAPTER THREE
and pilot. To avoid these "G" forces, an FAA rule states, "use either a standardrate turn (SRT) or
30 AOB, whichever occurs first."
ANGLE OF BANK REQUIRED FOR A HALF AND FULL STANDARD RATE
TURN: CORRECTED FOR ALTITUDE
TEMP
AOB
IAS
TAS
ALTITUDE
SRT
SRT
13C
100
101
8
15
120
122
9
18
1000'
150
152
12
23
5C
100
108
8
16
120
130
10
20
5000'
150
162
12
24
5C
100
117
9
18
120
140
12
21
10,000'
150
175
13
26
15C
100
127
10
19
120
152
12
23
15,000'
150
190
15
29
25C
100
137
11
21
120
154
13
25
20,000'
150
205
15
31
NOTE
For BI, use the AOB for 15,000 feet, which is where the "10 percent
and 20 percent" rules originate. Assume standard day for all figures.
The turns are practiced initially in level flight, crosschecking the nose with VSI and altimeter and
the wings on the turn needle. A oneneedle width deflection produces a onehalf SRT and a
twoneedle deflection a full SRT. Checking for 30 in 10 seconds for a SRT will check the
performance of the turns on the RMI. Since the AOB required to produce a constantrate turn
will vary with airspeed, we need some method of determining proper bank for a specific needle
deflection. An accurate rule of thumb is to establish an AOB equal to 10% of the airspeed for a
onehalf SRT, i.e., at 150 KIAS, a 15 AOB should initially be established. Double the above
value for bank necessary in a full SRT. However, use 30 maximum AOB while flying
instruments.
The above rule is known as the "10 percent" rule and is valid only during balanced flight. If
calibrated correctly, the turn needle always shows exact rate of turn even in an unbalanced
condition, but the AOB will vary according to the balance ball's position.
BASIC INSTRUMENTS FLIGHT PROCEDURES 3-13
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