B. Provide electrical power (Ref 24-22-00, Manual Control - Maintenance Practices (Apply Power)).
C. Check WEATHER RADAR (both AC and DC) circuit breakers on panel P18-1 are not flagged with DO-NOT-OPERATE identifiers.
D. Place controls on weather radar indicator as follows:
(1)
STBY mode selector - Depressed. Allow one minute warmup
period
(2)
AZIM switch indicator - Off
(3)
SEC SCAN switch indicator - Off
(4)
FRZ switch indicator - Off
(5)
TGT/ALRT switch indicator - Off
(6)
GAIN -PRE-SET
(7)
STAB - OFF
(8)
TILT - 0 Degree
(9)
INT - Mid scale
(10)
RANGE -TEST
E. Depress WX or MAP mode selector.
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5D8 Weather Radar Test Modes
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5D8
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5D8
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WEATHER RADAR SYSTEM - ADJUSTMENT/TEST
EFFECTIVITY
Airplanes With Sperry Primus 90 Weather Radar
1. General
A. The weather radar system adjustment/test procedure consists of an operational test (par. 2), a system test (par. 3), and a system shut down procedure (par. 4).
B. The operational test utilize the test mode and other self-test capabilities in the weather radar system to check system performance. When the test mode is selected, the transmitter transmits into the dummy load, and a special test pattern is generated. By utilization of the internally generated test pattern, the system is capable of detecting most faults without additional test equipment.
C. The system test checks the accuracy of antenna position when pitch and roll input signals are applied from the airplane attitude reference system. Radiating tests involving reception of radar echoes from external targets are also checked. The operational test is a portion of the system test, and should be performed first. The system tests are performed as a periodic maintenance function, or may be performed separately as aids to fault isolation.
WARNING: DO NOT OPERATE WEATHER RADAR WHILE AIRPLANE IS BEING REFUELED OR DEFUELED AND DO NOT OPERATE IN ANY RADIATING MODE WHILE A FUELING OPERATION IS BEING CONDUCTED WITHIN 200 FEET OF THE ANTENNA OR AN EXPLOSION MAY OCCUR.
PERSONNEL MUST NOT ENTER AN AREA CLOSER THAN 10 FEET IN FRONT OF A SCANNING RADIATING ANTENNA AND 80 FEET IN FRONT OF A STATIONARY RADIATING ANTENNA OR INJURY TO PERSONNEL MAY OCCUR.
CAUTION: WHEN WEATHER RADAR IS OPERATED IN ANY MODE OTHER THAN STANDBY OR TEST, DIRECT NOSE OF THE AIRPLANE SO FORWARD 180-DEGREE SECTOR IS FREE OF LARGE METALLIC OBJECTS (HANGARS, TRUCKS, OTHER AIRPLANES, ETC.) FOR A DISTANCE OF 300 FEET AND TILT ANTENNA UPWARD 14 DEGREES OR DAMAGE TO RECEIVER MAY OCCUR.
2. Operational Test -Weather Radar System
A. Reference Procedures
(1) 24-22-00, Manual Control -MP (apply power)
B. Prepare to test
(1)
Provide electrical power (Ref 24-22-00).
(2)
Check WEATHER RADAR AC and DC circuit breakers on electronic circuit breaker panel (P18-1) are closed.
(3)
Position controls and switches on weather radar indicator as follows:
(a)
STBY - Depressed. Allow one minute warmup period.
(b)
AZIM switch/indicator - Off
(c)
SEC SCAN switch/indicator - Off
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(d)
FRZ switch/indicator - Off
(e)
TGT ALRT switch/indicator - Off
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