Beechcraft C-12C Operator And Technical Reference Manual page 353

12. "Check gear" will be announced
immediately
announcement if gear is not down.
13. "Two hundred" at 200 feet AGL.
14. "Check gear" will be announced
immediately
announcement if gear is not down.
15. "One hundred" at 100 feet AGL.
16. "Check gear" will be announced
immediately
announcement if gear is not down.
17. "Minimum,
height.
18. "Localizer" at 1.3 to 1.5 dots either
side of center of beam.
repeated three times at 4-second
intervals.
19. "Glideslope" at 1.3 to 1.5 dots above
or below center of beam.
repeated three times at 4-second
intervals.
20. "Altitude,
deviation from altitude selected on the
altitude alerter.
21. "Check trim" when trim failure has
occurred.
times at 4-second intervals.
22. "Autopilot"
disconnected.
b. Normal Operation.
(1) Turn-on Procedure.
operable when the following conditions have been
met.
1. Battery switch – ON.
2. Avionics master switch – On.
3. GPAAS POWER circuit breaker – Set.
4. RADIO ALTM circuit breaker – Set.
5. VA FAIL
Extinguished.
(2) GPAAS Ground Check.
after 300-foot
after 200-foot
after 100-foot
minimum" at decision
Will be
Will be
altitude" at excessive
Will be repeated three
when autopilot has
The GPAAS is
annunciator light
1. GPAAS voice advisory VOL control –
Full clockwise.
2. VOICE
Extinguished.
3. Audio control panel – Set audio level.
4. VA
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
(Mode 1). The aural advisory "Two Thousand"
indicates that the aircraft is at a radio altitude of 2000
feet AGL. This advisory is cancelled 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 AGL. This advisory is cancelled 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 above ground level. It will
be repeated no more that 3 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.
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.
TM 1-1510-218-10
OFF switch-indicator
FAIL annunciator
"Minimum, minimum" will
altimeter TEST switch
"Two Thousand"
The aural advisories "One
–
light –
–
Advisory
The
3B-63