GCA Maneuver

CHAPTER THREE

T-34C INSTRUMENTS

Common Errors

Not entering VPS prior to starting the pattern.

Not transitioning at proper time or altitude. After the last 250 foot checkpoint, you

should anticipate the transition.

Not transitioning entirely on gyro, especially attempting the transition while

watching the altimeter.

Not using rudder during power changes, resulting in heading drift.

308.

GCA MANEUVER

The GCA maneuver closely resembles the procedures used for an instrument Ground

Controlled Approach (GCA).

The GCA maneuver is begun in normal cruise on a cardinal heading and base altitude.

While maintaining heading and altitude, make a level transition to the Basic

Approach Configuration (BAC):

Reduce power to 450 ftlbs torque, applying slight left rudder pressure to

compensate for the power reduction.

ii.

Check airspeed below 150 KIAS and lower the gear. Maintain the level flight

attitude on the attitude gyro and anticipate trim, right rudder up elevator.

iii.

Slowly raise the nose, to maintain altitude while decelerating to 120 KIAS,

toward the BAC level attitude (approximately 2 nose up). Trim right rudder,

nose up.

iv.

As you approach 120 KIAS, readjust power to approximately 700750 ftlbs.

Maintain 120 KIAS and retrim.

Perform the Landing Checklist down to the flaps, reporting each item to your

instructor. Check landing lights on.

Make a StandardRate Turn (twoneedle width turn) in either direction for 90 of

heading change while maintaining altitude. Lead the rollout by onethird the AOB.

Upon rolling out of the turn, stabilize the aircraft on altitude heading, and airspeed.

Make a level flight transition to the Final Approach Configuration (FAC) by

reducing power to 450 ftlbs of torque, checking the airspeed below 120 KIAS, and

lowering full flaps. As the flaps extend, smoothly lower the nose toward the FAC

3-20 BASIC INSTRUMENTS FLIGHT PROCEDURES