Rate Turns (RT) -Cont.

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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
30º AOB, whichever occurs first."
ANGLE OF BANK REQUIRED FOR A HALF AND FULL STANDARD RATE
TURN: CORRECTED FOR ALTITUDE
TEMP
AOB
IAS
TAS
ALTITUDE
½ SRT
SRT
13ºC
100
101
15º
120
122
18º
1000'
150
152
12º
23º
5ºC
100
108
16º
120
130
10º
20º
5000'
150
162
12º
24º
­5ºC
100
117
18º
120
140
12º
21º
10,000'
150
175
13º
26º
­15ºC
100
127
10º
19º
120
152
12º
23º
15,000'
150
190
15º
29º
­25ºC
100
137
11º
21º
120
154
13º
25º
20,000'
150
205
15º
31º
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 30º 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 15º AOB should initially be established. Double the above
value for bank necessary in a full SRT. However, use 30º 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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