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menu appears on the screen of the DC with the available data display
options. Pushing the appropriate Line Select Key (LSK) adjacent to the
menu item will select that sensor data for display on the PFD. When Radio
Altitude (RAD ALT) is displayed, it is shown in digital format just outside the
lower right corner of the attitude display. The white digital readout is in ten
(10) foot increments between twenty-five hundred (2,500) feet and two
hundred (200) feet, and five (5) foot increments below two hundred (200)
feet.
If the dual radio altimeters are paired on-side (pilot selected to radio
altimeter #1 and copilot selected to radio altimeter #2) the source of the
altimeter data is not shown. If the pilot and copilot have selected off-side
radio altimeters (pilot to #2 and copilot to #1) the letters RA, and the
numbers 1 or 2 as appropriate, are shown in white immediately to the right
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.)
OPERATING MANUAL
2A-34-00 PRODUCTION AIRCRAFT SYSTEMS
Page 18
October 11/01
Revision 5
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. 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 just above the readout of
current radio altitude. As the airplane descends to the selected DH, a
flashing white box is displayed around the current radio altitude when it is
equal to the selected DH. The white box flashes for five (5) seconds after
reaching DH, and remains displayed as long as airplane radio altitude is
less than the 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.
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 blue to brown as the airplane descends
through one thousand six hundred twenty (1,620) feet
MSL.
If there is a system malfunction that causes a loss of valid radio altimeter
data, the white digital radio altitude readout 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.
B. SPZ-8400 Radio Altitude Display:
The display of radio altitude on the PFD is selected using the SENSOR
function on the Display Controller (DC). When the SENSOR button is
selected, a menu appears on the screen of the DC with the available data
display options. Pushing the appropriate Line Select Key (LSK) adjacent to
the menu item will select that sensor data for display on the PFD. When
radio altitude (RAD ALT) is displayed, it is shown in digital format at the
bottom of the attitude display. The digital readout is in green, indicated in
ten (10) foot increments between twenty-five hundred (2,500) feet and two
hundred (200) feet, and five (5) foot increments below two hundred (200)
feet.
If the dual radio altimeters are paired on-side (pilot selected to radio
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-34-00
Page 19
October 11/01
Revision 5
altimeter #1 and copilot selected to radio altimeter #2) the source of the
altimeter data is not shown. If the pilot and copilot have selected off-side
radio altimeters (pilot to #2 and copilot to #1) the letters RA, and the
numbers 1 or 2 as appropriate, are shown in white immediately to the right
　
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