H24912
Weather Radar Waveguide Installation 562
34-41-22 Figure 401 Feb 15/78
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
4. Prepare to Install Waveguide
A. Remove protective covers from waveguide sections, if installed.
B. Check all waveguide sections for any damage.
C. Check all removed gaskets for any damage and replace as necessary.
D. Check pressure seal on section 1 for damage or lost gasket, replace as necessary.
5. Install Waveguide
A. Slide section 1 through hole in radome bulkhead and place in near final position with pressure seal gasket installed.
NOTE: When a waveguide section is reinstalled, make certain that the choke flange end is always mated with the cover flange end of the mating section. Otherwise, a significant increase in VSWR may result.
B. Connect section 1 to antenna input port loosely with four screws with waveguide gasket installed.
C. Install eight coupling screws loosely on section 1 pressure seal to bulkhead.
D. Place section 2 in position and align with section 1. Make certain that waveguide gaskets are installed, then connect forward flange to section 1 with four screws each.
E. Secure waveguide switch and installed dummy load to support loosely with four screws and lockwashers.
F. Connect electrical connector to waveguide switch. Align section 2 with waveguide switch and connect loosely with gasket, and four screws.
G. Align section 3 with waveguide switch and connect with gasket and four screws. Align section 3 with R/T mount tray and connect with gasket and four screws.
H. Line up mating flanges on waveguide sections 1 thru 3 and tighten securely. Tighten screws in pressure seal. Take up tolerances to attain as near a nonstress waveguide installation as possible by moving waveguide support bracket, R/T mount tray, and other items in the installation as necessary.
I. Install R/T unit and check for proper mating of waveguide flanges.
J. Make certain that screws in all flanges, the pressure seal flange, waveguide support bracket, dummy load, and R/T mount tray are tightened firmly.
6. Restore Airplane to Normal
A. Close radome.
B. Perform operational checks of weather radar system (Ref Weather Radar System -Adjustment/Test).
C. If system operates properly, close forward access door (1103) and nose radome as required.
562
May 15/77 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 34-41-22 Page 403
WEATHER RADAR WAVEGUIDE - REMOVAL/INSTALLATION
EFFECTIVITY
Airplanes with Collins WXR-700X Weather Radar
1. General
A. The waveguide transmission line consists of rigid and flexible waveguides sections. See Fig. 401 for section identification.
WARNING: OPERATION OF RADAR EQUIPMENT INVOLVES THE USE OF DANGEROUS VOLTAGES. BE SURE WEATHER RADAR POWER IS OFF AND WEATHER RADAR CIRCUIT BREAKERS, ON CIRCUIT BREAKER P6 ARE OPEN AND ARE TAGGED WITH DO-NOT-OPERATE IDENTIFIERS.
MAINTENANCE PERSONNEL MUST OBSERVE ALL SAFETY REGULATIONS AT ALL TIMES.
CAUTION: DO NOT PRY RADOME OR USE ANY LEVER IN SCREW HOLES. A LARGE SUCTION CUP MAY BE PRESSED ON RADOME TO OBTAIN HANDHOLD FOR OPENING. IN ORDER TO PREVENT WIND DAMAGE TO THE RADOME IT IS NECESSARY THAT BOTH RODS, DESIGNED TO SUPPORT THE RADOME WHEN OPEN, BE ATTACHED PROPERLY TO STRUCTURE WHENEVER THE RADOME IS OPEN.
WHEN REPLACING WEATHER RADAR WAVEGUIDE, USE CARE TO PREVENT WORKSTANDS OR EQUIPMENT FROM STRIKING LOCALIZER ANTENNA. DO NOT USE LOCALIZER ANTENNA AS A FOOTREST OR SUPPORT
2. Remove Waveguide
A. Open WEATHER RADAR AC circuit breakers on P6 circuit breaker panel, and tag with DO-NOT-Operate identifiers.
B. Remove screws securing antenna radome. Open radome using suction cup as required. Lock radome in position (Ref Chapter 53, Nose Radome).
C. Open forward access door No. 1103 and gain access to waveguide sections forward of receiver-transmitter (R/T) unit.
D. Remove weather radar R/T unit.
E. Release waveguide quick disconnect at antenna waveguide input port.
F. Remove four screws and lockwashers from waveguide flange between sections 1 and 2. Support forward end of section 2.
G. Remove screw securing clamp to section 1.
H. Remove eight screws from section 1 pressure seal flange on bulkhead. Retain flange gaskets at either end of section 1, then carefully move section 1 with pressure seal gasket forward through hole in bulkhead.
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