(2)
The self test uses the mode selector switch on the WXR control panel in the TEST mode. In the TEST mode the self test circuits monitor the performance of the weather radar system.
(3)
The weather radar control panel is referred to as the WXR control panel.
(4)
During the self test the weather radar system operates as follows:
(a)
It makes a test pattern which finds most system failure without test equipment.
(b)
The receiver/transmitter operates for 4 seconds.
(c)
A special test pattern is made on the NDs.
B. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 34-21-00/201, Inertial Reference System
(3)
The weather radar system with PWS interfaces with the systems listed below:
(a) AMM 31-51-00, Modular Avionics Warning Electronics Assembly
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747-400 MAINTENANCE MANUAL
(b)
AMM 31-61-00, EFIS/EICAS Interface Unit
(c)
AMM 34-12-00, Air Data System
(d)
AMM 34-33-00, Radio Altimeter System
(e)
AMM 34-45-00, Traffic Alert and Collision Avoidance System
(f)
AMM 34-46-00, Ground Proximity Warning System
C. Access
(1) Location Zones
221 Control Cabin, Left
222 Control Cabin, Right
D. Procedure
S 865-195
(1) Prepare for the weather radar operational test:
(a)
Supply electrical power (AMM 24-22-00/201).
(b)
Close these circuit breakers:
1) P7 Overhead Circuit Breaker Panel a) 7C7 WXR L RT b) 7C19 WXR R RT
(c)
Align the Left, Right, and Center IRUs in the NAV mode (AMM 34-21-00/201). 1) Make sure the ATT flags on the captain's and the first
officer's PFDs are not in view.
(d)
Normal operation of these systems are necessary for this task. 1) AMM 31-51-00, Modular Avionics Warning Electronics Assembly 2) AMM 31-61-00, EFIS/EICAS Interface Unit 3) AMM 34-12-00, Air Data System 4) AMM 34-33-00, Radio Altimeter System 5) AMM 34-45-00, Traffic Alert and Collision Avoidance System 6) AMM 34-46-00, Ground Proximity Warning System
(e)
Set the controls and the switches for the operational test as follows: 1) On the WXR control panel:
a) SYS switch - L b) TILT mode select - MAN c) TILT control - 0 degrees d) GAIN control - AUTO e) Mode selector - TEST
2) On the captain's and the first officer's EFIS control panels: a) WXR switch/indicator - off b) Mode selector - VOR c) Range - 40 d) L ADF/VOR switch - OFF e) R ADF/VOR switch - OFF f) CTR switch - off g) AIRPLANES WITH PREDICTIVE WINDSHEAR ACTIVE;
TERR switch - off 3) On the captain's source select module: a) EIU switch - AUTO
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b) IRS switch - L
4) On the first officer's source select module: a) EIU switch - AUTO b) IRS switch - R
5) On the captain's and the first officer's display transfer module: a) INBD CRT - NORM b) LWR CRT - NORM
6) On the EICAS select panel:
a) EIU switch - AUTO
b) LWR BRT control - middle position
7) Set the captain's and the first officer's INBD CRT brightness controls as follows: a) Outer knob - middle position b) Inner knob - middle position
S 715-218
(2) Do the weather radar system self test.
WARNING: DO NOT OPERATE THE WEATHER RADAR WHILE FUEL IS ADDED OR
_______ REMOVED FROM THE AIRPLANE. DO NOT TRANSMIT RF ENERGY WHILE FUEL IS ADDED OR REMOVED IN AN AREA 200 FEET OR LESS OF THE ANTENNA. THIS CAN CAUSE AN EXPLOSION.
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