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of the digital readout. If both pilot and copilot are selected to the same radio
altimeter, the RA is shown in amber. (The pilot and copilot can select radio
altimeter data source with options on the DC.)
A reference set option on the DC allows entering a radio altitude reference
for use as a visual indication of Decision Height (DH) during precision
approaches predicated on radio altitude data. A DH must be entered when
the airplane is one hundred (100) feet or more above the desired DH.
Pushing the FLT REF button on the DC displays the menu containing RAD
ALT. A value for radio altitude DH is entered with the rotary set knob and
selected for display with the LSK. The selected DH is displayed on the PFD
outside the lower right corner of the attitude indicator. As the airplane
descends to the selected DH, an empty box symbol is displayed in the
upper right corner of the attitude display when the airplane is within one
hundred (100) feet of the selected DH. When the airplane descends to the
set DH, an amber DH annunciation is displayed in the box. The DH symbol
flashes for five (5) seconds, then remains displayed whenever the airplane
is below DH. The readout of actual radio altitude (displayed at the bottom
of the attitude indicator) changes color from green to amber when the
airplane is one hundred (100) feet or less above the selected DH.
When a valid ILS frequency is received for an approach and the airplane
descends below two hundred (200) feet radio altitude, a yellow runway
symbol is displayed on the PFD, rising from the bottom of the attitude
display up to meet the airplane symbol on runway contact at landing. The
symbol also moves laterally to indicate displacement from localizer
centerline.
An additional reminder of airplane altitude is shown on the altitude tape on
the right side of the PFD. As the airplane descends below six hundred
(600) feet radio altitude, the color of the altitude tape changes to brown,
indicating proximity the ground. The brown altitude tape extends from six
hundred (600) feet down to zero (0) feet radio altitude. A yellow line
appears at the top of the brown portion of the tape. The line flashes for the
first ten (10) seconds after the brown tape is displayed or until the airplane
descends to four hundred (400) feet radio altitude, whichever occurs first.
The yellow line rides in front of the brown altitude tape display, indicating
height above touchdown.
NOTE:
This altitude reminder should not be confused with the
radio altitude display. The brown portion of the altitude
tape corresponds to airplane terrain clearance at a
given height above mean sea level (with barometric
altimeter set to QNH). For instance, if the airplane is
landing on a runway with an elevation of one thousand
twenty (1,020) feet MSL, the altitude tape color will
change from gray to brown as the airplane descends
through one thousand six hundred twenty (1,620) feet
MSL.
OPERATING MANUAL
2A-34-00 PRODUCTION AIRCRAFT SYSTEMS
Page 20
October 11/01
Revision 5
If there is a system malfunction that causes a loss of valid radio altimeter
data, the white digital radio altitude readout (and DH setting if selected) is
replaced by amber dashes (“- - - - “). If the yellow runway symbol is
displayed at the time of the failure, the symbol is removed from the PFD.
3. Controls and Indications:
There are no separate controls or indicators for the radio altimeter system. All
cockpit interface with the system is through the DCs and the EFIS (PFD) display
system. When the airplane is on the ground with full electrical power, the normal
radio altitude readout is -5 (minus five) feet ± 5 feet.
A radio altimeter self-test may be initiated (on-side test only: pilot tests RAD ALT
#1, copilot tests RAD ALT #2) using the LSK labeled RAD ALT on the TEST menu
of the DC. When the test is in progress, a radio altitude of one hundred (100) feet
should be displayed on the PFD:
• Preflight: Entering a DH of 50 feet prior to performing the radio altimeter
self-test will test the DH display on the PFD.
• In-Flight Test: Entering a DH of 200 feet prior to performing the radio
altimeter self-test will test the DH display on the PFD.
NOTE:
The radio altimeter self-test is inhibited with the AFCS
engaged. The self-test is also inhibited by the fault
warning computer during certain flight director modes.
A. Circuit Breakers (CBs):
Circuit Breaker Name CB Panel Location Power Source
RADIO ALT #1 CPO I - 4 L MAIN 28V DC
RADIO ALT #2 CPO J - 4 R MAIN 28V DC
B. Advisory (Blue) CAS Messages:
CAS Message Cause or Meaning
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湾流4操作手册 Gulfstream IV Operating Manual 2(112)
