(2)
On airplanes with Delco CIV-31N or CIVA-32C INS, the WAYPT position of the data selector, in conjunction with the waypoint selector, allows waypoint and destination positions to be inserted into the DCU. The data displays will display the inserted latitude and longitude of the waypoint/destination when the data selector is set to WAYPT and the waypoint selector is properly positioned. The WAYPT position of the data selector is also used in conjunction with the waypoint selector, to display unfixed inertial present position and to allow eradication of a position fix from the computer. Latitude and longitude are loaded and displayed in the same units and accuracies as when the data selector is set to POS.
XA XA NOTE:____Waypoints cannot be loaded if HOLD light is illuminated. XA
On airplanes with Delco CIVA-20, CIVA-25, CIVA-28-A or CIVA-28A-2
XA INS, see *[1] and *[2], 34-41-00 page 1; the WAY PT position, in conjunction with the waypoint/DME selector, allows waypoint and DME station data to be inserted and displayed. Prior to the first insertion after turn-on, the data displays will display 0's for all waypoints, but will display the last DME station data which was inserted during the previous flight. The WAY PT position is also used to display inertial present position when the HOLD key is pressed. Latitude and longitude are loaded and displayed in degrees and minutes to the nearest tenth of a minute. DME altitude is in feet and is rounded off to the nearest thousand feet. The range is from sea level (0) to 15,000 feet. DME station frequency ranges from 108.00 to
135.95 MHz and is displayed in the format XX.XX.X. For example, a frequency of 117.50 MHz is displayed as 11.75.0.
NOTE: On airplanes with Delco CIVA-28A-2 INS,
____ the DME station frequency is not displayed.
(3) Present track angle and ground speed are indicated in the data displays when the mode selector is at NAV and the data selector is set to TK/GS. Present track angle is displayed from 0 to 359.9 degrees in the left-hand data display to the nearest tenth of a degree with respect to true north. Ground speed is displayed from 0 to 2400 knots in the right-hand data display to the nearest knot. The displayed value of ground speed is always actual, but actual true heading is displayed in place of present track angle when ground speed is below 75 knots. The INS indicates a malfunction if the displayed ground speed is 910 knots or greater.
EFFECTIVITY
AIRPLANES WITH DELCO INS CONFIG 1 ATG A Page 22 Apr 25/8934-41-00
On airplanes with Delco CIVA-28A-2 INS,
Along Track Acceleration (ATA) will be displayed on the CDU when the
HOLD light is lit and the data selector is in the TR/GS position.
ATA will be displayed in the right CDU display in units of
milli g's. The left CDU display will be blank for a positive ATA,
and display a N for a negative ATA.
(4) Airplane heading and drift angle are indicated in the data displays
when the mode selector is at NAV and the data selector is set to
HDG/DA. Heading is displayed from 0 to 359.9 degrees in the left-
hand data display to the nearest tenth of a degree with respect to
true north. Drift Angle is displayed from 0 to 180 degrees right or
left of the airplane heading in the right-hand data display to the
nearest degree. The displayed value of heading is always actual,
but the displayed drift angle is 0 degrees when ground speed is
below 75 knots. The INS will indicate a malfunction if the
displayed drift angle is 45 degrees or greater.
(5) Cross track distance and track angle error are indicated in the
data displays when the mode selector is at NAV and the data
selector is set to XTK/TKE. Cross track distance is displayed from
0 to 999.9 nautical miles right or left of the desired track in the
left-hand data display to the nearest tenth of a nautical mile.
Track angle error is displayed from 0 to 180 degrees right or left
of the desired track angle in the right-hand data display to the
nearest degree. The displayed value of cross track distance is
always actual, but desired track angle minus heading is displayed
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本文鏈接地址：747飛機維護手冊AMM CHAPTER 34 - NAVIGATION 第34章導航2(87)
