(c)
The squitter ON/OFF to the on position. The DME indicators display to a 6 |0.5 miles.
S 725-020
(4)
Repeat step (c) for 60, 150, 240, and 330 miles.
S 865-021
(5)
On the audio selector panel, set the NAV-1/2 switch and the VOICE/BOTH/RANGE switch to the BOTH or RANGE position.
S 725-022
(6)
Push and hold the test set IDENT switch.
(a) Make sure you hear the DME audio tone.
S 725-023
(7) Release the IDENT switch.
NOTE: The DME will break lock-on if the IDENT switch is held
____
for longer than 12 seconds.
S 865-024
(8) On the VHF NAV control panel, tune to 108.05 MHz.
(a) The DME indicators should show dashes/flags.
S 945-025
(9)
Set the test set controls as follows:
(a)
The squitter ON/OFF to the OFF position.
(b)
The X-Y to the Y position.
(c)
The Distance Display - Slew to 180 miles.
(d)
Set the velocity to 600
(e)
Set the velocity IN/OUT switch to the IN position.
(f)
The squitter ON/OFF to the ON position.
(10)
DME will search, lock on, and track smoothly inbound.
S 725-027
(11)
Repeat step (i) with Velocity IN/OUT switch to the OUT position, display starts at 5 miles.
(12)
Remove electrical power if it is not necessary (Ref 24-22-00/201).
S 725-026
S 865-010
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT EFIS ú
34-55-00
ú ú 03 Page 505 ú Nov 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
DME SYSTEM - DESCRIPTION AND OPERATION
______________________________________
1. General_______
A. The DME (distance measuring equipment) system automatically measures the distance (in nautical miles) between the airplane and a selected ground station. The system measures the airplane-to-station slant-range distance (line-of-sight) and the information is displayed on a digital readout indicator as miles-to-go. The system is designed to indicate a range of approximately 390 nautical miles.
B. The DME (distance measuring equipment) systems automatically measure the distance (in nautical miles) between the airplane and a selected ground station. DME-1 and DME-2 systems measure the airplane-to-station slant-range distance (line-of-sight) and displays miles-to-go on the captain's and first officer's RDDMIs. DME-1 and DME-2 also display miles-to-go on the captain's and first officer's electronic horizontal situation indicator (EHSI) respectively. The system is designed to indicate a range of approximately 390 nautical miles.
C. Two complete Collins 860E-5 DME systems are installed in the airplane. Each system consists of an interrogator (transmitter-receiver) unit, an antenna, two distance indicators and a remote tuning control panel (Fig. 1).
D. The DME system measures the distance to the navigation facility by transmitting a pulse-coded interrogation signal which actuates a corresponding ground station reply. This reply signal is received and processed by the interrogator. The output of the interrogator is applied to the digital readout of the RDDMI DME indicator (Fig. 2).
E. The flight management computer (FMC) may select the operating frequency of DME-1 and DME-2 when the correct mode is selected on the applicable VHF NAV control panel. Also, the DME supplies the distance data to the FMC (Fig. 2).
F. An audio signal from the DME interrogator is applied to the flight interphone system.
G. Suppression signals between the ATC transponders and DME interrogators prevent mutual interference between the systems.
2. Control Panel_____________
A. DME-1 system is controlled from the captain's VHF NAV control panel and DME-2 system from the first officer's VHF NAV control panel. Both control panels are located on the aft electronics panel.
B. Each ground station is assigned a specific VOR frequency and an associated DME frequency. Since the DME system operates in conjuction with the VOR/ILS navigation system, controls for both are located on the same control panel.
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