T-45A UJPT, E2-C2, ADV, & IUT Eng-19
Flight Instruments
2.
Function: provides second visual AOA
display and warning when arresting hook is
not extended during carrier operations
a.
Indexer assembly contains three
independent indexer lights
(1) Upper chevron green light
indicates slow airspeed or high
AOA
(2) Center donut amber light indicates
on-speed or correct AOA
(3) Lower chevron red light indicates
fast airspeed or low AOA
b.
Displayed indexer flashes when hook
is not down with landing gear down
and the HOOK BYPASS switch in
carrier position
3.
Controls/switches/indicators
a.
Dimming control mounted left side of
indexer light display, both cockpits
b.
Press-to-test button located on top of
indexer used for lamp test
4.
Subsystem interfaces
a.
Power: 28 VDC essential services bus
through forward AOA indicator
b.
The indexer flashes when the HOOK
BYPASS switch is in CARRIER mode
and hook is not down; controlled by
AOA flasher unit in lower equipment
compartment and HOOK BYPASS
switch in fwd cockpit
c.
Inoperative NWS caused by a weight-
on-wheels switch failure may be
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(8-03) Original
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