(2)
Access Zone
1103 Forward Access Door
C. Procedure
S 864-022
(1) AIRPLANES WITH SPERRY PRIMUS 90 WEATHER RADAR SYSTEMS; Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P6 Load Control Center - Right
1) WEATHER RADAR AC
2) WEATHER RADAR DC
S 864-024
(2) AIRPLANES WITH COLLINS WXR-700X WEATHER RADAR SYSTEMS; Open this circuit breaker and attach a DO-NOT-CLOSE tag:
(a) P6 Load Control Center - Right
1) WEATHER RADAR R/T
S 014-010
(3) Open the nose radome to get access to the WXR antenna:
(a) Remove the screws from the nose radome.
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A
737-300/400/500MAINTENANCE MANUAL
(b)
Use a suction cup to open the radome.
(c)
Lock the radome in its open position.
S 014-011
(4)
Open the forward access door (1103) to get access to the waveguide sections forward of the receiver-transmitter (R/T).
S 034-013
(5)
Remove the WXR R/T (Ref 34-41-41/401).
S 024-016
(6)
Remove the waveguide sections:
(a) Disconnect section 1: 1) Release the quick-disconnect that holds section 1 to the
WXR antenna.
2) Remove the four screws that attach section 1 to section 2.
3) Hold the forward end of section 2 to prevent force on the
connections.
4) AIRPLANES WITH COLLINS WXR-700X WEATHER RADAR SYSTEMS; Remove the screw and clamp from section 1.
5) Remove the eight screws that attach section 1 to the forward pressure bulkhead.
6) Carefully remove section 1, with its pressure seal gasket, through the hole in the forward bulkhead.
7) Examine the waveguide section No. 1 (flexible) inner side for heavy layers of contamination. a) Replace waveguide section No. 1 with heavy layer of
contamination (AMM 34-41-21/401). b) Do not try to clean or remove contamination from the flexible waveguide section.
(b) Disconnect section 2:
1) AIRPLANES WITH SPERRY PRIMUS 90 WEATHER RADAR SYSTEMS; Remove the four screws that attach section 2 to the waveguide switch.
2) AIRPLANES WITH COLLINS WXR-700X WEATHER RADAR SYSTEMS; Remove the four screws and the lock washers that attach section 2 to the R/T mount.
3) Remove section 2 and its gasket.
(c) AIRPLANES WITH SPERRY PRIMUS 90 WEATHER RADAR SYSTEMS; Disconnect section 3: 1) Remove the four screws that attach section 3 to the forward
end of the R/T mount.
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A 737-300/400/500MAINTENANCE MANUAL
ANTENNA WAVEGUIDE INPUT PORT
WAVEGUIDE SECTION 1 ANTENNA
DUMMY LOAD (AFT OF WAVEGUIDE SWITCH)
WAVEGUIDE SWITCH
PRESSURE SEAL FLANGE AND GASKET
FWD WAVEGUIDE SECTION 2
SEE A
WAVEGUIDE FLANGE SCREW (4 EACH FLANGE)
WAVEGUIDE SWITCH
ELECTRICAL CONNECTOR
FORWARD PRESSURE BULKHEAD (STA 178)
WAVEGUIDE
SECTION 2 DRAIN HOLE
FWD WAVEGUIDE SECTION 1
A
RECEIVER-TRANSMITTER
R/T MOUNT TRAY
WAVEGUIDE SECTION 3 (FLEXIBLE)
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