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CHAPTER THREE
T-34C INSTRUMENTS
again adjusted to maintain a 1000 FPM descent. Now let us consider the corrections necessary
for a rate of descent greater than the desired rate of 1000 FPM. If, for example, after descending
500 feet, only 25 seconds have elapsed, you are ahead of desired performance; power must be
added and nose attitude adjusted to slow the rate of descent to less than 1000 FPM. As soon as
the altitude change and time agree (500 feet at 30 seconds or 750 at 45 seconds), power and
attitude must then be adjusted to a value between the initial setting, which resulted in a descent
greater than 1000 FPM, and the first adjustment, which gave less than 1000 FPM descent. These
power and attitude adjustments will continue to be made until altitude change and elapsed time
coincide with a 1000 FPM descent. A constant rate cannot be maintained without a constant
airspeed (130 KIAS), therefore prior to making power corrections, crosscheck airspeed.
7.
The same principles apply for 1000 FPM climbs. A 1000 FPM climb will normally be
achieved by using 850 ft­lbs of torque. However, if you determine that the rate is insufficient
and the addition of power to maximum allowable does not yield a 1000 FPM climb, maintain
130 KIAS, regardless of rate of climb.
8.
Common Errors
a.
Starting the maneuver off altitude.
b.
Not using a three­second lead. An incorrect or late transition will adversely affect
your arriving at the first checkpoint at the correct time.
c.
Attempting to fly performance scan and neglecting airspeed. Positive performance
checkpoints occur only once every 250 feet. The common tendency is to allow
airspeed to remain off until a performance check indicates a deviation from the
desired rate. If the airspeed is not 130 KIAS, the attitude is incorrect and the
performance cannot possibly be proper. Make appropriate nose correction for
airspeed as soon as any deviation from 130 KIAS is indicated.
d.
Not retrimming after making a correction. Remember, if you correct for airspeed or
change power and ease the nose to maintain airspeed, you have "set" a new attitude.
You must trim to hold it.
e.
Correcting the rate with nose movement: power controls rate.
f.
Correcting for airspeed with power: nose attitude controls airspeed.
NOTE
(e) and (f) are the most common errors.
g.
Overcorrecting for airspeed (equate nose movement to airspeed correction).
3-18 BASIC INSTRUMENTS FLIGHT PROCEDURES


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