Rudder Pedal Shakers

T-34C AIRCRAFT SYSTEMS FAMILIARIZATION

CHAPTER FIFTEEN

WORKBOOK

AOA Test Switch

The AOA test switch is located on the TEST panel at the bottom of the instrument panel in both

cockpits. It is labeled AOA, APRCH, and STALL and is used to test the AOA and stall warning

systems. Selecting APRCH causes the indicator and indexer in both cockpits to display 20 units

and a yellow circle (yellow doughnut). The STALL position causes the rudder pedal shakers to

activate immediately and both cockpits to display 29 units and a green ( V ) chevron.

Rudder Pedal Shakers

Rudder pedal shakers, located on each aft rudder pedal, provide both pilots with a physical

warning that the aircraft is approaching a stall. An eccentric metal mass is driven by an electric

motor when activated by the AOA system to cause pedal vibrations in both cockpits when the

aircraft is 5-10 KIAS above stall.

ANGLE-OF-ATTACK SYSTEM

15-5