(4) Aural "Check Gear" Advisory (Mode 4).
The aural "Check Gear" advisory indicates that the
aircraft has descended to 500 feet AGL and the
landing gear is not down. This advisory is repeated
once at 100-foot intervals down to 100 feet AGL.
(5) Aural "Glideslope" Advisory (Mode 5).
The aural advisory "Glideslope" indicates that the
aircraft has exceeded 1.3 to 1.5 dots above or below
the center of the glideslope beam. The glideslope
advisory is armed when a valid glideslope signal is
detected and the aircraft is below 1000 feet AGL. It
will be repeated no more than three times at 4-second
intervals unless the aircraft is returned to less than 1.3
to 1.5 dots from the center of the beam. The
glideslope advisory is disabled upon loss of a valid
glideslope signal, during climb, on a localizer back
course, below the decision height set on the radio
altimeter or if the navigation receiver is not tuned to a
localizer frequency. This advisory is inhibited by the
weight on wheels strut switch.
(Mode 6). The aural advisory "Minimum, Minimum"
indicates that the aircraft is at the radio altitude
selected by the crew with the radio altimeter indicator's
decision height knob. This advisory is cancelled when
valid information from the radio altimeter is lost, during
climb, whenever the aircraft is above 1000 feet AGL,
or whenever the aircraft is out of the operating altitude
range of the radio altimeter.
(Mode 7). The aural advisory "Altitude, Altitude"
indicates the approach to a preselected altitude as the
aircraft reaches a point 1000 feet from the selected
altitude or, after reaching the selected altitude, when
the aircraft deviates more than 250 feet from the
(8) Aural "Check Trim, Check Trim, Check
Trim" Advisory. The aural advisory "Check Trim,
Check Trim, Check Trim" indicates that the autopilot
has had a trim failure.
(9) Aural "Autopilot" Advisory. The aural
advisory "Autopilot" indicates that the autopilot has
d. Emergency Procedures. If an emergency
or malfunction makes it necessary to disable the
GPAAS, pull the GPAAS POWER circuit breaker
located on the instrument panel (GPAAS audio may be
turned off by pressing the VOICE OFF switch).
3B-32. TRANSPONDER SET (AN/APX-100).
For information on the transponder set, refer to
Chapter 3, Paragraph 3-10.