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A 737-300/400/500MAINTENANCE MANUAL
28 V DC IRU 1
28 V DC IRU 1
5V AC
5V AC
IRU 1 DATA
IRU 2 DATA
DAA 1 VALID
DAA 2 VALID
MASTER TEST GROUND
ISDU Schematic
Figure 9
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A 737-300/400/500MAINTENANCE MANUAL
(2) The DSPL SEL switch selects the type of data to be displayed on the ISDU numeric displays. The IRU, as selected on the SYS DSPL switch, supplies the data. The five switch positions and the data displayed for each position is as follows:
(a)
TEST - The test position provides a remote test signal to the selected IRU. When held in the TEST position, fixed outputs from the IRU selected by the SYS DSPL switch are displayed on the ISDU and the associated pilot's instruments. The test switch is inhibited during the navigational mode when the airplane ground speed is greater than twenty knots and during the attitude mode. During the first 2 seconds, all display segments and lighted pushbuttons, except the lightplate lamps, illuminate simultaneously and the highlighter bars on the ENT and CLR keys illuminate. Then, for 8 seconds fault messages are generated which are followed by test value displays.
(b)
TK/GS (Track Angle/Ground Speed) - True track angle from 0 to
359.9 degrees is displayed in the left display with a resolution of 0.1 degree. Ground speed from 0 to 2000 knots is displayed in the right display with a resolution of 1 knot.
(c)
PPOS (Present Position) - Latitude from 90°S to 90°N is displayed in the left display and longitude from 180°E to 180°W is displayed in the right display. Resolution is 0.1 minute. The display is used when inserting present position during initialization of the two IRUs or when monitoring present position from an IRU during flight.
(d)
WIND (Wind speed and Direction) - Wind speed from 0 to 256 knots is displayed in the left display with a resolution of 1 knot. Wind direction from 0 to 359 degrees is displayed in the right display with a resolution of 1 degree. When the airplane is on the ground, the wind speed display will read 100 knots.
(e)
HDG/STS (heading/Status) - True heading from 0 to 359.9 degrees is displayed in the left display with a resolution of 0.1 degree. The ALIGN STATUS appears in the left side of the right display and is a countdown of the last 7 minutes of the ALIGN cycle. Malfunction codes (M/C) appear in the right side of the right display.
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