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STUDENT GUIDE FOR T-1A AIRCRAFT SYSTEMS
CHAPTER TEN
Supplemental Stall Indication System
A stall warning annunciator, placarded STALL, is located on the outboard P and CP sides of the
shroud panel. Both annunciators receive signals from both AOA computers and illuminate
whenever stall conditions exist. The AOA computers also send a signal to a stall warning horn.
The 1000 Hz, continuous sounding horn operates through the speaker system whenever a stall
condition exists.
AOA Indicator
The AOA indicator is installed on the P instrument panel and provides a continuous display of
AOA. AOA reference settings are always above stall speed. For example, rotating the index
reference pointer to 1.2 V/VS references to 20% above stall speed. A setting of 1.3 V/VS would
provide a 30% stall margin reference. Rotating the bug will also bias the AOA indexer lights to
the indicator reference setting. An optimum on-speed AOA would be to fly the indicator needle
in the center of the reference bug, green donut illuminated.
AOA Indexer
The AOA indexer installed on top of the shroud panel provides a three-color, three-symbol
display of AOA deviation. The indexer correlates the difference between indicated AOA and
reference AOA. The three-color display is used to depict five AOA conditions. When the
aircraft is on-speed, the green donut in the center is illuminated. If the approach is slow, the red
chevron on top and the center green donut are both illuminated. If the speed is very slow, only
the red chevron is illuminated. If the approach is fast, the green donut and the bottom yellow
chevron are both illuminated. When the approach speed is too high, only the yellow chevron is
illuminated.
AVIONICS
10-13


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