(10) If no further DME tests are required, restore airplane to original
 configuration and remove electrical power (AMM 24-22-00/201).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 TASK 34-55-02-735-088
 3. System Test - DME No. 1 and 2
_____________________________
 A. Equipment and Materials
 (1)  Transponder/DME Test Set - IFR Model ATC-600A
 B. References
 (1)  
AMM 24-22-00/201, Manual Control (Apply Power)

 (2)  
AMM 34-55-02/501, DME System - Adjustment/Test (Operational Test)

 C. Procedure
 S 945-089
 CAUTION: NEVER PLACE REMOTE TEST SET ANTENNA CLOSER THAN 15 INCHES TO
_______ AIRPLANE ANTENNA WITH TEST SET ON OR DAMAGE TO TEST SET WILL RESULT.
 (1)  
Put the remote test set antenna approximately 21 inches from DME antenna for system under test.

 S 945-090

 (2)  
Test set antenna should be approximately same height as airplane antenna.

 S 825-090

 (3)  
Route and connect coax from remote test set antenna to test set which should be located in cockpit.

 S 865-092

 (4)  
Set test set controls as follows:

 (a)  
PWR switch - AC or BAT (as appropriate)

 (b)  
Mode switch - DME

 (c)  
Velocity Select switch - RANGE

 (d)  
Velocity HI/LO switch - HI

 (e)  
Squitter SQTR/OFF switch - OFF

 (f)  
X/Y switch - X

 D. Test DME System
 NOTE: Before you start the test, make sure the other VHF NAV control
____ panel frequency displays are tuned to a frequency other than test frequency.
 S 715-093
 (1)  
Do the DME system operational test procedure provided in AMM 34-55-02/501, DME System - Adjustment/Test.

 S 865-095

 (2)  
On captain's VHF NAV control panel, position switches as follows:

 (a)  
AUTO--MANUAL switch indicator - MANUAL

 (b)  
MANUAL frequency display - 108.00 MHz

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A 737-300/400/500MAINTENANCE MANUAL
 S 865-098

 (3)  Place test set X/Y switch to Y and using SLEW switches simulate a
 distance of 6 miles as read on test set display.
 (a) Both RDDMI DME readouts display dashes.
 (b) Both EHSI's display DME--- in upper left-hand corner.
 S 865-105
 (4)  Place test set X/Y switch to X and SQTR/OFF (squitter) switch to
 SQTR.
 (a) Both RDDMI DME readouts display 6 |0.5 miles.
 (b) Captains' EHSI displays DME 6 |0.5 miles.
 S 735-110
 (5)  Repeat steps (3) and (4) for 60, 150, 240 and 330 miles.
 (a) Both RDDMI DME readouts display |2 miles.
 (b) Make sure the captain's EHSI displays DME distance |2 miles.
 S 865-117
 (6)  On audio selector panel, select NAV-1 and place V/B/R switch to B
 or R.
 S 865-119
 (7)  Hold the test set IDENT/50% RPLY switch in IDENT and make sure
 presence of DME audio.
 S 865-120
 (8)  Release the IDENT/50% RPLY switch.
 NOTE: DME will break lock-on if IDENT is held for longer than 12____
 seconds.
 (a) The DME audio should stop.
 S 735-121
 (9)  Repeat steps (6) thru (8) for all other audio stations.
 S 865-124

 (10)
 Set test set X/Y switch to Y.  DME-1 should unlock within 15 seconds and both RDDMI DME-1 readouts should display dashes. Captain's EHSI should display DME---.

 S 825-130

 (11)
 Using test set SLEW switches simulate a distance of 150 miles as read on test set display. Wait 20 seconds before proceeding with test.
　
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