Recording Accelerometer

CHAPTER THIRTEEN

T-34C AIRCRAFT SYSTEMS FAMILIARIZATION

WORKBOOK

The pointer needle indicates the direction and the rate of turn. The normal rate of turn in

instrument flying conditions, indicated by a two-needle width deflection, is known as a standard

rate turn (SRT) and results in 360 of turn in two minutes. A one-needle width deflection is

known as a one-half-standard rate turn and will result in 360 of turn in four minutes. A red

power failure flag labeled OFF will be displayed on the instrument face if electrical power to the

gyro is lost.

The ball in the inclinometer indicates the relationship between the angle-of-bank and the rate of

turn by its position in relation to two white vertical lines (the center). In a practical aerodynamic

sense, the balance ball shows directly the longitudinal alignment of the aircraft. Uncoordinated

control inputs will cause the aircraft to fly in an unbalanced condition. This will cause the

balance ball to move left or right of center, indicating a slip or skid.

1304. RECORDING ACCELEROMETER

Both cockpits have recording accelerometers which are "powered" by "G" force and are located

at the bottom of the instrument panel. Their purpose is to continuously indicate positive and

negative "G" loads on the aircraft, as well as recording maximum positive and negative Gs.

Each instrument has three pointers. The indicating pointer (the longest) indicates presently

applied "G" load, while the positive and negative pointers follow the indicating pointer to its

maximum travel. These recording pointers remain at the maximum load imposed and can only

be reset by depressing the reset knob in the lower left corner of the instrument. In the Naval Air

Training Command the reset knobs are actuated by authorized maintenance personnel only. The

T-34C limits are +4.5 and -2.3 Gs.

Figure 13-4 Recording Accelerometer

13-4

ATTITUDE, TURN AND SLIP, AND ACCELEROMETER SYSTEMS