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S 750-033
(14) Push the TERR display switchlight to disengage the terrain display on the weather
radar indicator.
S 845-052
(15) Push the OFF button on the mode selector of the weather radar indicator.
S 845-092
(16) On the IRS control panel, set the left and right IRS MODE SELECTORS to OFF.
S 864-015
(17) Remove electrical power if it is not necessary (AMM 24-22-00/201)
For Training Purpose Only Printed:May 2005
B757-200Aircraft Recur rent Training Manual - 44 -
EGPWS DISPLAY SWITCHING UNIT –
REMOVAL/INSTALLATION
1. General
A. This procedure has two tasks. The first task removes the EGPWS Display Switching Unit
(DSU). The second task installs the EGPWS Display Switching Unit.
TASK 34-42-41-004
2. Remove the EGPWS Display Switching Unit
A. References
(1) AMM TASK 20-10-07-000-801 p201, E/E Box Removal
B. Access
(1) Location Zones
(a) 205 Electrical and Electronics Compartment
(b) 101 Flight Compartment - Left
(c) 102 Flight Compartment - Right
(2) Access Panels
(a) 1201 Electronic Equipment Access Door
C. Procedure
S 864-002
(1) Open these circuit breakers on the overhead circuit breaker panel, P18, and attach
DO-NOT-CLOSE tags:
(a) 18A7 GND PROX WARN
(b) 18B7 TERR DSU
S 034-003
(2) Loosen the 4 mounting screws that mount the DSU to the bracket on the E2-4 shelf.
S 034-004
(3) Move the DSU out.
S 034-005
(4) Disconnect the electrical connectors D9100 from the DSU.
S 024-006
(5) Remove the control panel.
TASK 34-42-21-404-CDF
3. Install the EGPWS Terrain Display Control Panel
A. References
(1) AMM 24-22-00/201, Electrical Power - Control
B. Access
(1) Location Zones
(a) 205 Electrical and Electronics Compartment
For Training Purpose Only Printed:May 2005
B757-200Aircraft Recur rent Training Manual - 45 -
(b) 101 Flight Compartment - Left
(c) 102 Flight Compartment – Right
(2) Access Panels
(a) 1201 Electronic Equipment Access Door
C. Procedure
S 864-008
(1) Make sure that these circuit breakers on the P18 panel are open with DO-NOT-CLOSE
tags attached:
(a) 18A7 GND PROX WARN
(b) 18B7 TERR DSU
S 434-009
(2) Connect the electrical connectors D9100 to the DSU.
S 424-010
(3) Install the DSU on the bracket and tighten the mounting screws.
S 864-011
(4) Remove the DO-NOT-CLOSE tags and close the circuit breakers that follow on the P18
panel:
(a) 18A7 GND PROX WARN
(b) 18B7 TERR DSU
S 864-012
(5) Supply electrical power (AMM 24-22-00/201).
S 754-013
(6) Do the Master Light Test and make sure that the control panel lights come on.
S 865-068
(7) Set the left and right IRS mode select switches to the NAV position and align the left
IRS and right IRS.
S 860-014
(9) Make sure that the aircraft is located on an unobstructed ramp position. For an initial
position of the EGPWS, allow up to 20 minutes for the system to come on line and to
acquire satellites. Verify the INOP light is not illuminated on the Terrain Display Control
panel.
(10)
WARNING: DO NOT OPERATE THE WEATHER RADAR WHILE FUEL IS ADDED OR
REMOVED FROM THE AIRPLANE. DO NOT TRANSMIT RF ENERGY
WHILE FUEL IS ADDED OR REMOVED IN AREA 200 FEET OR LESS
OF THE ANTENNA. THIS CAN CAUSE AN EXPLOSION.
For Training Purpose Only Printed:May 2005
B757-200Aircraft Recur rent Training Manual - 46 -
For Training Purpose Only Printed:May 2005
DO NOT OPERATE THE WEATHER RADAR WHILE THE AIRPLANE IS
IN A HANGAR OR OTHER ENCLOSURE. MAKE SURE NO PERSONS
ARE IN THE AREA 15 FEET OR LESS FROM THE ANTENNA WHEN IT
TRANSMITS RF ENERGY. RF ENERGY CAN CAUSE INJURY TO
PERSONS.
CAUTION: WHEN AN LRU FAILURE MESSAGE SHOWS, STOP THE WEATHER
RADAR SYSTEM TEST. IF YOU DO NOT STOP THE WEATHER RADAR,
THE RESULT WILL BE DAMAGE TO THE DEFECTIVE LRU OR OTHER
SYSTEM COMPONENTS.
S 860-277
(9) Set the Range switch on the WXR indicator to the TEST position.
S 860-278
(10) Do these steps on the WXR indicator:
(a) Set the range switch to 50 nautical miles
(b) Set the mode switch to the MAP position
S 750-138
(11) Make sure the weather radar data shows on the displays.
S 750-139
(11) Set the TERR display switchlight on the Terrain Display control panel to the ON
position.
S750-129
(13) Make sure the terrain data and the blue TERR messages show on the displays.
S 750-033
(14) Push the TERR display switchlight to turn off the terrain display on the weather radar
indicator.
S 845-052
(15) Push the OFF button on the mode selector of the weather radar indicator.
　
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