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the skin (AMM 51-21-04/701).
(d) On top of the alodine, apply two layers of the BMS 10-79 Type III primer.
NOTE: Let each layer dry for the correct cure time.
S 624-008
(4) Apply a layer of the BMS 5-95 corrosion inhibiting compound in the screw holes and in
the coaxial cable hole.
S 624-009
(5) Apply a very thin layer of the BMS 5-95 on the base of the antenna.
NOTE: Do not get the BMS 5-95 on the O-ring or the O-ring groove.
S 214-010
(6) Examine the O-ring and replace it if it is damaged.
S 624-011
(7) Apply a layer of the BMS 3-24 grease on the O-ring and O-ring groove.
S 434-012
(8) Install the O-ring on the antenna.
S 624-013
(9) Apply a layer of the BMS 5-95 corrosion inhibiting compound on the threads and shank
of the antenna screws.
S 424-014
(10) Install the GPS antenna.
(a) Connect the electrical connector to the antenna.
(b) Put the antenna into its position on the airplane.
(c) Install three of the screws that hold the antenna.
For Training Purpose Only Printed:May 2005
B757-200Aircraft Recur rent Training Manual - 37 -
(d) Remove the unwanted BMS 5-95 corrosion inhibiting compound from the around
the antenna with the BMS 11-7 solvent (AMM 20-10-22/701).
S 764-015
(11) Do a check of the resistance between the antenna and the airplane skin as follows:
(a) Connect the ohmmeter between the base of the antenna and the airplane skin.
NOTE: Get access to the base of the antenna through the hole for the last
screw.
1) Make sure the measured resistance is 0.025 ohms or less.
S 434-016
(12) Install the last screw that holds the antenna.
S 114-017
(13) Remove the unwanted BMS 5-95 corrosion inhibiting compound from around the head
of each screw with the BMS 11-7 solvent (AMM 20-10-22/701).
S 394-018
(14) Apply the aerodynamic seal as follows (AMM 51-31-01/201):
(a) Apply the BMS 5-95 sealant around the antenna where it touches the airplane
skin.
NOTE: Make sure no air bubbles are in the sealant. Use a sufficient quantity of
the sealant to make the surface smooth.
(b) Make an aerodynamic fillet seal with the fillet smoothing spatula.
(c) Remove all the unwanted BMS 5-95 sealant from the area around the antenna.
(d) Fill the screw holes with the BMS 5-95 sealant.
NOTE: Make the sealant smooth in relation to the antenna surface.
F. GPS Antenna Installation Test
S 864-019
(1) Supply electrical power (AMM 24-22-00/201).
S 864-020
(2) Remove the DO-NOT-CLOSE tags on the overhead circuit breaker panel and close
these circuit breakers:
(a) 18A7 GND PROX WARN
(b) 18B7 TERR DSU
S 584-021
(3) Move the airplane to a position where the GPS antennas have a clear view of the GPS
satellites.
S 860-006
For Training Purpose Only Printed:May 2005
B757-200Aircraft Recur rent Training Manual - 38 -
(4) Do this task: Enhanced Ground Proximity Warning System - Operational Test
(AMM 34-42-00, page CDF-501)
G. Put The Airplane Back to Its Usual Condition
S 864-023
(1) 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 - 39 -
GROUND PROXIMITY WARNING MODULE -
REMOVAL/INSTALLATION
1. General
A. This subject has two tasks. One is for the removal and one is for the installation of the
warning module. These tasks have steps for the removal of the warning module, the
installation of the replacement warning module, and a test of the lights.
B. The ground proximity warning module (P3-7) is on the first officer's instrument panel, P3.
TASK 34-42-21-004-017
2. Ground Proximity Warning Module Removal
A. Access
(1) Location Zone
222 Control Cabin, RH
B. Procedure
S 864-002
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P42 5V Lighting Panel
1) 42, P3-P23-P10 LTG 28V AC SEC
(b) P18-1 Electronic Load Circuit Breaker Panel
1) 18A7, GND PROX WARN
S 024-004
(2) Remove the warning module:
(a) Loosen the fasteners on the module.
(b) Pull the module from the instrument panel until you can get to the electrical
connection.
(c) Disconnect the electrical connector from the module.
TASK 34-42-21-404-018
3. Ground Proximity Warning Module Installation
A. References
(1) 24-22-00/201, Manual Control
(2) IPC 34-49-11，Fig. 3
B. Access
(1) Location Zone
222 Control Cabin, RH
C. Procedure
S 864-006
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P42 5V Lighting Panel
1) 42, P3-P23-P10 LTG 28V AC SEC
(b) P18-1 Electronic Load Circuit Breaker Panel
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