(5)  
Depress WX pushbutton. Check gain message is no longer displayed.

(6)  
If no further tests of weather radar are required, perform weather radar shutdown procedures.

G.  Range Test
(1)  
Prepare for test as described in par. C.

(2)  
On indicator, depress WX, WX/T or MAP pushbutton.

(3)  
Depress RNG 10, 20, 50, 120, and 240 pushbuttons, one at a time. Check range display, in message slot 3 (Fig. 501), changes with range selection and there are five evenly spaced range circles for ranges 10 and 50, four evenly spaced range circles for ranges 20, 120, and 240.

(4)  
Checked that corresponding range intervals of 2, 5, 10, 30, and 60 for selected range displayed in message slot 5.

(5)  
If no further tests of weather radar are required, perform weather radar shutdown procedure.

H.  Antenna Tilt Test
(1)  
Prepare for test as described in par. C.

(2)  
On indicator, depress WX, WX/T or MAP pushbutton.

(3)  
Rotate TILT control fully clockwise. Check indicator tilt display message slot 14 (Fig. 501), reads 15-00 (x) and close-in targets diminish.

NOTE:  (X) -- an arrow, pointing upwards or downwards corresponding to fully clockwise or counterclockwise rotated control, will be displayed.

(4)  
Rotate TILT control fully counterclockwise. Check indicator tilt display message reads 15-00 (x) and close-in targets are more prominent.

(5)  
Return TILT control to mid-scale position.

(6)  
If no further tests of weather radar are required, perform weather radar shutdown procedure.

I.  Stabilization Test
(1)  
Prepare for test a described in par. C.

(2)  
On indicator, depress WX, WX/T or MAP pushbutton. Check selected mode is displayed in message slot 1 (Fig. 501).

(3)  
On P6 circuit breaker panel, open VG-2 circuit breaker. Check ATT is displayed in message slot 13 (Fig. 501).

(4)  
Close VG-2 circuit breaker. Check ATT no longer displayed.

(5)  
On indicator, depress STAB pushbutton. Check USTB is displayed in message slot 13.

(6)  
Depress STAB pushbutton again. Check message slot 13 is blank.

(7)  
If no further test of weather radar are required perform weather radar shutdown procedure.

4.  Weather Radar Shutdown Procedure
A.  Rotate INT and MKR controls, on indicator, fully counterclockwise.
B.  Depress PWR pushbutton on indicators.
C.  Remove electrical power if no longer required (Ref 24-22-0).
505 
Feb 20/85  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  34-41-02 Page 505 

WEATHER RADAR ANTENNA - REMOVAL/INSTALLATION
EFFECTIVITY

Airplanes with Sperry Primus 90 Weather Radar
1. General
WARNING:  BE SURE POWER IS OFF AND ALL WEATHER RADAR CIRCUIT BREAKERS ARE OPEN ON CIRCUIT BREAKER PANEL P6. OPERATION OF RADAR EQUIPMENT INVOLVES THE USE OF HIGH VOLTAGES THAT ARE DANGEROUS TO LIFE.
MAINTENANCE PERSONNEL MUST OBSERVE ALL SAFETY REGULATIONS AT ALL TIMES.
2.  Remove Weather Radar Antenna
A.  Open nose radome (Ref Chapter 53, Nose Radome).
B.  Disconnect weather radar antenna electrical connector (Fig. 401).
C.  Disconnect waveguide section from antenna waveguide input port by removing one screw from each corner of waveguide flange. Collect four washers, and one O-ring gasket from waveguide flange.
D.  Remove four antenna mounting bolts. Collect a washer from each bolt. If shims are installed between antenna mount base and bulkhead fastener, make certain that same shims are reinstalled when antenna is installed.
NOTE:  Antenna reflector must be handled with care so that no undue pressure is exerted which will bend the reflector and cause distortion of the transmitted beam. If antenna is not to be replaced or reinstalled immediately, waveguide and connector must be protected from dirt, debris and moisture.
3.  Install Weather Radar Antenna
A.  Remove protective covers from waveguide and connector, if installed. Make certain that shims (if any) are in place (Ref par. 2.D. above).
B.  Place antenna unit into place and install four mounting bolts and washers (Fig. 401).
C.  Connect weather radar antenna electrical connector.
D.  Make certain that 0-ring gasket is installed in flange recess, then connect waveguide to antenna with a washer and screw at each corner of waveguide flange.
E.  Perform weather radar system tests as required (Ref 34-41-0 A/T).
F.  Close radome and fasten securely.
5C8
Feb 20/89 34-41-12 Page 401
　
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