TM 1-1510-218-10
3A-45
Figure 3A-27. Ground Proximity Altitude Advisory System Controls and Indicator
The GPAAS system receives 28 Vdc power
through a 1-ampere circuit breaker, placarded VOICE
ADVSR, located on the instrument panel.
(1) GPAAS
Switch-Indicator
Lights.
A
switch-indicator is located on the instrument panel.
The upper half of the switch-indicator (yellow) is
placarded VOICE OFF. The lower half is an indicator
(red) only and is placarded VA FAIL.
Pressing
the
upper
(VOICE OFF)
switch
indicator disables the GPAAS voice advisory, and
illuminates the VOICE OFF indicator light.
The
VA FAIL annunciator light (red) will
illuminate when the GPAAS fails.
(2) GPAAS Volume Control. A GPAAS
volume
control
placarded VOL, located on the
instrument panel, controls the audio volume of the
GPAAS advisory/warning messages down to a certain
minimum level.
(3) GPAAS Aural Warning Indications. The
following is a list of aural indications. Due to the
possibility of activating more than one condition at a
time, a warning priority has been established. The
highest priority message will be announced first. If a
higher priority item is received after a message is
