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A 737-300/400/500MAINTENANCE MANUAL
DME DISTANCE
EHSI
DME System Component Location
Figure 1 (Sheet 1)
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A 737-300/400/500MAINTENANCE MANUAL
AUTO MANUAL
DME DN/RT
CONTROL PANEL
DME INTERROGATOR
DME System Component Location
Figure 1 (Sheet 2)
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A
737-300/400/500MAINTENANCE MANUAL
C. The control panel consists of the following controls and switches:
(1)
AUTO/MAN Selector Switch
(a) The AUTO/MAN selector switch is a push-on/push-off illuminated switch that is used to select either AUTO or MAN frequency control of the VHF NAV and DME systems. The selected frequency control mode is annunciated by the switch. AUTO selection is armed when 115v ac power is applied to the system.
(2)
Frequency Selector Controls
(a) Dual concentric controls are provided for the manual selection of the frequency. The outer knob controls tens and units and the inner knob controls tenths and hundredths. The frequency range is 108.00 to 117.95 MHz, selectable in 50 KHz steps. The frequency manually selected is displayed by the manual frequency display.
(3)
Test Switches
(a) Two switches, three positions, spring-loaded to the center position, are provided to self-test the VHF NAV and DME systems. Activation of a test switch sends a test ground to the appropriate system initiating the self-test. Activation of a VOR, UP/LT, or DN/RT test interrupts the flight management system interlock circuit, which disengages auto tuning of the DME system if auto tuning is in operation.
(4)
Frequency Displays
(a) The MANUAL frequency display shows the manual frequency selected. When the system is in the AUTO mode, a dayglo fire orange FLAG (bar) is raised over the manual display window, and the frequency selected by the flight management system appears in the AUTO display. With the system in the manual mode, the flag is retracted from the manual display and the automatic display is blanked. The frequency displays and mode annunciator are tested through the airplane master test circuit. When the master test switch is actuated, both displays read 188.88, flashing 2 seconds on and 1 second off (Fig. 4). Both the AUTO and MAN annunciations are illuminated steadily.
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A 737-300/400/500MAINTENANCE MANUAL
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A 737-300/400/500MAINTENANCE MANUAL
3. Antennas
________
A. The DME antennas are blade-type units which are connected to the interrogator units by coaxial cable. The No. 1 system antenna is installed on the bottom of the fuselage at station 468. The No. 2 system antenna is installed at station 580.
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