34-48-03
ú ú 02 Page 503 ú Nov 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
LRRA ANTENNA - REMOVAL/INSTALLATION
___________________________________
1. General_______
A. This subject has two tasks, a removal and an installation of the LRRA antennas. The installation task also has a procedure to do a check of the bond resistance between the antenna and the airplane surface.
B. After you disconnect the antenna cables, make sure you connect them correctly.
C. These tasks apply to the transmit and the receive antennas.
TASK 34-48-11-004-001
2. LRRA Antenna Removal (Fig. 401)____________________
A. Access
(1) Location Zone
200 Lower Half of Fuselage
B. Procedure
S 864-002
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P6 Load Control Center - Right
1) RADIO ALTM - 2
(b)
P18 Load Control Center - Left
1) RADIO ALTM - 1
S 024-003
(2) Remove the LRRA antenna:
(a)
Remove the screws that connect the antenna to the airplane structure.
(b)
Lower the antenna until you can get access to the coaxial connector(s).
(c)
Disconnect the coaxial cable(s) from the antenna.
(d)
Remove the antenna and gasket.
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34-48-11
ALL ú ú 01 Page 401 ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500
MAINTENANCE MANUAL
SEE A
LRRA-2 TRANSMIT ANTENNA (STA 390)
LRRA-2 RECEIVE
ANTENNA (STA 410)
LRRA-1 RECEIVE
ANTENNA (STA 430)
LRRA-1 TRANSMIT
ANTENNA (STA 450)
COUPLING
CONNECTOR ANTENNA
ANTENNA CABLE
CONNECTOR
MOUNTING SCREWS
(8 LOCATIONS) FWD
REINFORCING RING
DOUBLER
RETAINER SKIN RING
GASKET
A
Low Range Radio Altimeter Antenna Installation Figure 401
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34-48-11
ALL ú ú 03 Page 402 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
TASK 34-48-11-404-004
3. LRRA Antenna Installation (Fig. 401)
_________________________
A. Standard Tools and Equipment
(1) Bonding Meter (AMM 20-22-01/601, Electrical Bonding - I/C)
B. References
(1)
SWPM 20-20-00, Standard Wiring Practices Manual
(2)
AMM 34-48-00/501, Low Range Radio Altimeter System
(3)
AMM 34-48-03/501, Low Range Radio Altimeter System
(4)
AMM 51-31-00/201, Seals and Sealing
(5)
SRM 51-20-01
C. Access
(1) Location Zone
200 Lower Half of Fuselage
D. Procedure
S 864-005
(1) Make sure these circuit breakers are open:
(a)
P6 Load Control Center - Right
1) RADIO ALTM - 2
(b)
P18 Load Control Center - Left
1) RADIO ALTM - 1
S 214-014
CAUTION: MAKE SURE THE ANTENNA GASKET IS IN GOOD CONDITION AND THE
_______ FAYING SURFACES ARE CLEAN. A BAD CONNECTION CAN CAUSE AN INCORRECT SYSTEM OPERATION.
(2) Do a check of the antenna gasket:
(a) Replace the antenna gasket if it shows cracks or shows signs of corrosion.
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