S 865-083
(6)
Use the first officer's audio control panel to make sure you can hear a DME audio tone in the flight compartment (AMM 23-51-00/501).
F. Right DME System Test
S 865-054
(1)
On the test set, make sure the frequency is 108.00 MHz.
S 865-045
(2)
Use the alphanumeric keypad to set the right VOR frequency to 108.00 MHZ in the PRESELECT area of the CDU.
S 865-044
(3)
Push the LSK adjacent to the <VOR-R prompt.
(a) Make sure the DME-R distance indications on the captain's and the first officer's ND's show 150.0 |1.0 NM.
S 865-055
(4) On the test set, change the distance to 90.0 NM.
(a) Make sure the DME-R distance indications on the captain's and first officer's ND's show 90.0 |0.5 NM.
S 865-056
(5) On the test set, change the test frequency to a frequency other than the test frequency.
(a) Make sure the DME-R distance indications on the captain's and first officer's ND's show (---).
S 865-058
(6)
On the test set, set the DME test signal so it is modulated by an audio tone.
S 755-059
(7)
Use the first officer's audio control panel to make sure you can hear a DME audio tone in the flight compartment (AMM 23-51-00/501).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
G. Put the Airplane Back to Its Usual Condition S 865-026
(1) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
DME INTERROGATOR - REMOVAL/INSTALLATION
_______________________________________
1. General
_______
A. There are two tasks in the subject. The first task is the removal of the distance measuring equipment (DME) interrogator. The second task is the installation of the DME interrogator.
B. The left and the right DME interrogators are installed in the main equipment center. The left DME interrogator (B81) is installed on shelf No. 2 of the E2 electronics equipment rack. The right DME interrogator (B82) is installed on shelf No. 3 of the E2 electronics equipment rack.
TASK 34-55-01-004-001
2. DME Interrogator Removal
________________________
A. References
(1)
06-09-01/201, Body Section 41 Access Doors and Panels
(2)
20-11-22/401, Rack-Mounted Electrical/Electronic Module
B. Access
(1)
Location Zone 117/118 Electrical and Electronics Compartment
(2)
Access Panels
117AL Electronics Compartment Access Door
C. Procedure
S 864-002
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P7 Overhead Circuit Breaker Panel
1) 7B8 NAV RADIO DME L
2) 7B19 NAV RADIO DME R
S 014-019
(2) Open the 117AL electronics compartment access door to get to the DME interrogator (Ref 06-09-01/201).
S 024-003
CAUTION: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
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