Beechcraft C-12C Operator And Technical Reference Manual page 289

4. VA FAIL
Extinguished.
5. Radio altimeter DH SET control – Set
to 200 feet.
6. Radio altimeter TEST switch – Press
and hold.
be annunciated once followed by the
illumination of the VA FAIL light.
7. Radio
Release.
c. GPAAS Modes of Operation. The GPAAS
operates in the following modes of operation.
(1) Aural "Two Thousand" Advisory, Mode 1.
The aural advisory "Two Thousand" indicates that the
aircraft is at a radio altitude of 2000 feet AGL. This
advisory is canceled when valid information from the
radio altimeter is lost, during climb, or whenever the
aircraft is out of the operating altitude range of the
radio altimeter.
(2) Hundred Foot Increment Aural Altitude
Advisories, Mode 2.
Thousand, Nine Hundred, Eight Hundred, Seven
Hundred, Six Hundred, Five Hundred, Four Hundred,
Three Hundred, Two Hundred, One Hundred" indicate
that the aircraft is at the associated radio altitude in
feet above ground level. This advisory is canceled
when valid information from the radio altimeter is lost,
during climb, or whenever the aircraft is out of the
operating altitude range of the radio altimeter.
(3) Aural "Localizer" Advisory, Mode 3. The
aural advisory "Localizer" indicates that the aircraft has
deviated from the center of the localizer beam in
excess of 1.3 to 1.5 dots. The localizer advisory is
armed when a valid localizer 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 localizer course. The localizer advisory is
disabled when a valid localizer signal has been lost,
during climb, below the decision height set on the
radio altimeter, or if the navigation receiver is not
tuned to a localizer frequency.
(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.
annunciator light
"Minimum, minimum" will
Altimeter TEST switch
The aural advisories "One
– (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.
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.
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.
(6) Aural
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
decision height knob. This advisory is canceled 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.
(7) Aural "Altitude, Altitude" Advisory, Mode
7. The aural advisory "Altitude, Altitude" indicates the
approach to a pre-selected 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 selected altitude.
(8) Aural "Check Trim, Check Trim, Check
Trim" Advisory.
Check Trim, Check Trim" indicates that the autopilot
has had a trim failure.
(9) Aural "Autopilot" Advisory.
advisory "Autopilot" indicates that the autopilot has
disengaged.
d. Emergency Procedures. If an emergency
or malfunction makes it necessary to disable the
GPAAS, pull the VOICE ADVSR circuit breaker
located on the instrument panel. Turn off the GPAAS
audio by pressing the VOICE OFF switch.
3A-34. STORMSCOPE.
For information on the Stormscope, refer to
Chapter 3, Paragraph 3-9.
3A-35. TRANSPONDER SET (APX-100).
For information on the transponder set, refer to
Chapter 3, Paragraph 3-10.
TM 1-1510-218-10
The glideslope
Advisory "Minimum,
The aural advisory "Check Trim,
3A-47/(3A-48 blank)
The
Minimum"
The aural