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(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
D. Installation Procedure
SUBTASK 860-005
(1) Make sure that these circuit breakers are open:
(a) Circuit Breaker Panel, P18-1:
1) 18A7 GND PROX WARN
2) 18B7 TERR DSU
SUBTASK 420-001
CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS
ON THE EGPWS. IF YOU TOUCH THESE CONDUCTORS,
ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE EGPWS.
(2) Install the EGPWC.
SUBTASK 860-002
(3) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a) Circuit Breaker Panel, P18-1:
1) 18A7 GND PROX WARN
2) 18B7 TERR DSU
E. Installation Test
SUBTASK 860-003
(1) Do this task: Supply Electrical Power (AMM 24-22-00 p201).
SUBTASK 740-002
(2) Make sure the green COMPUTER OK light on the front panel of the EGPWS is on.
(a) If your airline maintains a terrain database version requirement, then do this task:
Verify the Terrain Database Part Number (AMM 34-42-00 page CDF-201).
SUBTASK 860-006
(3) Do this task: Ground Proximity Warning System - Operational Test
(AMM 34-42-00, page CDF-501)
For Training Purpose Only Printed:May 2005
B757-200Aircraft Recur rent Training Manual - 32 -
SUBTASK 860-001
(4) Put the aircraft back to it’s usual condition.
SUBTASK 860-004
(5) Do this task: Remove Electrical Power (AMM 24-22-00 p201).
Enhanced Ground Proximity Warning Computer
Figure 401
For Training Purpose Only Printed:May 2005
B757-200Aircraft Recur rent Training Manual - 33 -
EGPWS GPS ANTENNA – REMOVAL/INSTALLATION
1. General
A. This procedure has two tasks. The first task is the removal of a GPS antenna. The second
task is the installation of a GPS antenna.
B. The GPS antenna for EGPWS is installed at station 690.
TASK 34-58-01-024-001
2. GPS Antenna Removal (Fig. 401)
A. Equipment
(1) Sealant removal tool - hardwood or plastic
B. Access
(1) Location Zones
107 Top of Fuselage, Center
C. Removal Procedure
S 864-002
(1) Open these circuit breakers on the overhead circuit breaker panel and attach
DO-NOT-CLOSE tags:
(a) 18A7 GND PROX WARN
(b) 18B7 TERR DSU
S 024-003
(2) Remove the GPS antenna:
CAUTION: BE CAREFUL WHEN YOU USE THE SEALANT REMOVAL TOOL TO
BREAK THE SEAL. TOO MUCH FORCE CAN CAUSE DAMAGE TO
THE AIRPLANE SKIN, THE COAXIAL CABLE, OR THE ANTENNA.
(a) Use the sealant removal tool to break the seal all around the antenna.
(b) Remove the sealant that covers the antenna screws.
(c) Remove the antenna screws.
CAUTION: MOVE THE ANTENNA THE LEAST DISTANCE NECESSARY TO
DISCONNECT THE CONNECTOR. DAMAGE TO THE CABLE CAN
OCCUR IF YOU PULL THE CABLE WITH TOO MUCH FORCE.
(d) Carefully pull the antenna until you can get access to the connector.
(e) Disconnect the connector.
NOTE: Make sure the cable and connector do not fall into the airplane fuselage.
(f) Remove the GPS antenna.
TASK 34-58-01-424-004
3. GPS Antenna Installation (Fig. 401).
A. Equipment
For Training Purpose Only Printed:May 2005
B757-200Aircraft Recur rent Training Manual - 34 -
(1) Resistance measuring bridge or ohmmeter
For Training Purpose Only Printed:May 2005
B757-200Aircraft Recur rent Training Manual - 35 -
B. Consumable Materials
(1) A00145 Sealant - BMS 5-95, Class B-2
(2) B00184 Solvent - BMS 11-7
(3) C00175 Primer - BMS 10-79, Type III
(4) C00855 Alodine
(5) D00294 Grease - BMS 3-24
(6) G00033 Woven Cheesecloth - BMS 15-5
C. References
(1) AMM 20-10-22/701, Metal Surfaces
(2) AMM 24-22-00/201, Manual Control
(3) AMM 51-21-04/701, Alodine Coating
(4) AMM 51-31-01/201, Seals and Sealing
D. Access
(1) Location Zones
107 Top of Fuselage, Center
E. Installation Procedure
S 864-005
For Training Purpose Only Printed:May 2005
B757-200Aircraft Recur rent Training Manual - 36 -
(1) Open these circuit breakers on the overhead circuit breaker panel and attach
DO-NOT-CLOSE tags:
(a) 18A7 GND PROX WARN
(b) 18B7 TERR DSU
S 114-006
(2) Clean the airplane skin and the inner antenna surface with the solvent, BMS 11-7
(AMM 20-10-22/701).
S 144-007
(3) If there is corrosion on the airplane skin below the antenna, prepare the airplane skin
as follows:
(a) Remove the corrosion (AMM 20-10-22/701).
(b) Clean the airplane skin in the area of the corrosion with the solvent, BMS 11-7
(AMM 20-10-22/701).
(c) Apply a layer of alodine on the airplane skin in the area where the antenna touches
　
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