Quantcast Vertical S-1 Pattern (S-1)

 

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T-34C INSTRUMENTS
CHAPTER THREE
307.
VERTICAL S­1 PATTERN (S­1)
1.
This pattern is flown in VPS and on any numbered heading. It consists of a 1000­FPM
descent for 1000 feet, followed by a 1000 FPM climb for 1000 feet. This series of descents and
climbs is performed twice.
2.
Begin the pattern with the descent using a three­second lead prior to a 6 or 12. Perform the
same transition to a descent utilized in constant­rate maneuvers. Performance checks are also
accomplished as in the constant­rate maneuvers.
3.
The transition from the descent to the climb is started three seconds prior to the end of the
descending minute or 50 feet prior to the end of the 1000 foot descent, whichever occurs first.
Add power toward approximately 850 ft­lbs torque, while smoothly raising the nose toward the
climbing attitude of approximatelynose up; retrim for the 130 KIAS climbing attitude. As
power is added, backpressure must be simultaneously increased in order to prevent acceleration
and delay in climb rate.
NOTE
Because of the "lag" or inherent error in the altimeter, the altitude
will rarely stabilize exactly on a 1000 foot mark during the
transition. Therefore, a 1000­foot altimeter mark on the 6 or 12 is
not an accurate checkpoint and should not be considered. The
transition is performed on the gyro, then reestablish the attitude
scan and finally, check performance at the first 250 feet in the
climb.
4.
The transition from the climb to the descent is started three seconds prior to the end of the
climbing minute or 50 feet prior to reaching the original altitude, whichever occurs first. Reduce
the PCL (applying simultaneous, proportional left rudder pedal control pressure) to
approximately 250 ft­lbs, while simultaneously lowering the nose to the descending attitude,
approximatelynose down. The second transition to a climb is accomplished exactly as was
the first.
5.
In both climb and descent, the final checkpoint (250 feet remaining prior to transition) is
relatively inadequate for actual rate correction, as there is insufficient altitude remaining for a
correction to be effective. The value of these points is for determining whether to transition on
time or altitude. For example, if in the climb, the altimeter reads 250 feet to go (750 in the
climb) and ten seconds prior to a twelve (clock on ten), you are behind in the climb rate, and will
probably transition on the clock.
6.
Complete the pattern by simultaneously reducing torque to VPS level flight power 50 feet
prior to reaching level off altitude, lowering the nose to the VPS level flight attitude. Stabilize in
VPS. Return to normal cruise when directed by your instructor by setting 1015 ft­lbs (695º ITT
max). Two to three knots prior to 150 KIAS, set approximately 650­700 ft­lbs and retrim.
BASIC INSTRUMENTS FLIGHT PROCEDURES 3-19


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