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|  CHAPTER FIFTEEN
T-34C AIRCRAFT SYSTEMS FAMILIARIZATION
WORKBOOK
Figure 15-2 Angle of Attack Indicator
AOA Indexer
An AOA indexer is located at the top left side of the glareshield in each cockpit. The AOA
indexer is an illuminated display of symbols. A green "V"-shaped chevron at the top, a yellow
(amber) circle ("doughnut") in the middle, and a red inverted "V"-shaped chevron at the bottom.
During a precise landing approach, the indexer identifies required nose attitude changes to
maintain optimum approach airspeed. The symbols will illuminate individually or as two in
combination, to provide five approach speeds and AOA conditions as shown below.
Airspeed
AOA
Symbol
Green ( V )
Slow
High
Green ( V )
Yellow ( O )
Slightly slow
Slightly high
Yellow ( O )
OK
OK
Yellow ( O )
Slightly fast
Slightly low
Red (Λ)
Red (Λ)
Fast
Low
Except during ground test, the indexer operates only when the aircraft is in flight and the landing
gear is extended. The indexer is activated by the down limit switch on the landing gear gearbox
when the gear is extended, and deactivated on landing by the right landing gear safety switch.
15-4
ANGLE-OF-ATTACK SYSTEM
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