CAUTION: NEVER PLACE REMOTE TEST SET ANTENNA CLOSER THAN 15 INCHES TO AIRPLANE ANTENNA WITH TEST SET ON. DAMAGE TO TEST SET WILL RESULT.
(2)
Route and connect coax from remote test set antenna to test set which should be located in cockpit.
(3)
Set test set controls as follows:
PWR switch -AC or BAT (as appropriate)
Mode switch – DME
Velocity Select switch – RANGE
Velocity HI/LO switch – HI
Squitter ON/OFF switch – ON
X/Y switch - X
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C. Test DME System
(1)
On both VHF NAV control panels, select 109.00 MHz and position DME mode selector to NORM. Appropriate RDDMI indicators shall display flags.
(2)
Activate DME TEST. Verify that in approximately 1.5 seconds, DME displays 000 +0.5 miles.
(3)
On appropriate VHF/NAV control panel, tune frequency display to 108.00 MHz
(4)
Position test set controls as follows:
(a)
Squitter ON/OFF - OFF
(b)
Distance Display - Slew to 6 miles. Appropriate RDDMI indicators shall display flags.
(c)
Squitter ON/OFF -ON. Appropriate RDDMI indicators display 6 +0.5 miles.
(5)
Repeat step (4) for 60, 100, and 188 miles.
(6)
On audio selector panel, select NAV-1 and place VOICE/BOTH/RANGE switch to BOTH or RANGE.
(7)
Hold test set IDENT switch in IDENT and verify presence of DME audio.
(8)
Release IDENT switch.
NOTE: DME will break lock-on if IDENT is held for longer than 12 seconds.
(9)
On VHF/NAV control panel, tune frequency display to 108.05 MHz. Appropriate RDDMI indicators shall display flags.
(10)
Position test set controls as follows:
(a)
Squitter ON/OFF - OFF
(b)
X-Y- Y
(c)
Distance Display - Slew to 180 miles.
(d)
Velocity Select - 600
(e)
Velocity IN/OUT - IN
(f)
Squitter ON/OFF -ON. DME will search, lock on, and track smoothly inbound.
(11)
Repeat step (10) with Velocity IN/OUT in OUT and distance display beginning at 5 miles.
(12)
Restore airplane and test set to original configuration and remove electrical power if no longer required.
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DME ANTENNA - REMOVAL/INSTALLATION
1. Equipment and Materials
A. Equipment
(1)
Sealing gun -6-inch Length cartridge, Senco Research, or equivalent (not required for material furnished in tubes)
(2)
Bonding Meter (Ref 20-22-01)
(3)
Aerodynamic smoother cutting tool - hardwood or plexiglass
(4)
Varnish brush -1- or 2-inch
(5)
Spatula
B. Materials
(1)
Aerodynamic smoother - BMS 5-79, class B-1/2 (Ref 20-30-11)
(2)
Accelerator - as indicated on aerodynamic smoother container (Ref 20-30-11)
(3)
Aliphatic Naphtha - TT-N-95 (Ref 20-30-31)
(4)
Anticorrosion compound -BMS 3-23
2. Remove Antenna
A. Remove four mounting screws (Fig. 401).
B. Using care, lower antenna from mounting until cable can be disconnected.
CAUTION: DO NOT PULL ANTENNA.
C. Disconnect antenna from antenna connector.
D. Remove antenna and O-ring.
3. Install Antenna
A. Use cutting tool to remove aerodynamic smoother from antenna base and mounting area.
B. Remove grease, oil, dirt, and chips from antenna base and mounting area. Use small varnish brush to apply fresh aliphatic naphtha for cleaning. Wipe cleaner off with clean cloth.
C. Clean mating surfaces of antenna and aircraft structure.
D. Apply a protective coat of corrosion preventive compound (Ref 51-21-91 CP).
E. Place O-ring in position on antenna base.
F. Connect antenna cable to antenna connector (Fig. 401).
G. Position antenna in place and install three of the four mounting screws.
H. Check electrical bond between antenna base and airplane skin per 20-22-01.
(1)
Connect the ohmmeter or the resistance measuring bridge between the empty antenna mounting screw hole (antenna base plate) and the airplane skin.
(2)
Make sure the resistance is not more than 0.1 ohm.
(3) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737 AMM 飞机维护手册 导航 NAVIGATION 2(93)
