34-43-00
(6)
Close following circuit breakers on electronic circuit breaker panel
P7: WEA RAD (R/T-1) on 115 VAC essential radio bus WEA RAD (IND-1) on 115 VAC essential radio bus WEA RAD (R/T-2) on 115 VAC radio bus number 2 WEA RAD (IND-2) on 115 VAC radio bus number 2
(7)
Perform weather radar system operational test to check basic operation of weather radar system before performing system tests (Ref 34-43-00, Adjustment/Test).
(8)
To perform pitch and roll stabilization accuracy tests of the antenna using stabilization inputs from INS, and INS units installed on tilt tables, refer to the following test steps (18) thru (27).
(9)
Make certain that all weather radar circuit breakers are open on circuit breaker panel P7 (see previous test), then open radome to gain access to antenna (Ref 34-43-03 for nose radome opening procedures). Swing radome fully open and latch in place.
(10)
Place INS units 1 and 2 on tilt table and connect extension cables. Zero level the tables. INS units should face in same general direction as when installed in mounting rack in airplane.
NOTE: Provide conditioned air for INU's.
____
(11)
Provide electrical power. Refer to 24-22-00.
(12)
Prepare INS for operation and erect to at least coarse align mode if INS is not operating in this mode from previous tests (Ref 34-41-00).
(13)
Close following circuit breakers on electronic circuit breaker panel
P7: WEATHER RADAR (R/T-l) on 115 VAC essential radio bus WEATHER RADAR (IND-l) on 115 VAC essential radio bus WEATHER RADAR (R/T-2) on 115 VAC radio bus number 2 WEATHER RADAR (IND-2) on 115 VAC radio bus number 2
WARNING:_______OBSERVE ALL RADIATION PRECAUTIONS. ANTENNA MAY ALSO SCAN IN RADOME DURING TESTS AND ENDANGER PERSONNEL AT ANTENNA.
(14)
At weather radar control panel, select STBY (standby) mode. If STAB (stabilization) on-off switch is provided control on panel, set to STAB (or ON) position.
(15)
At R/T unit control panels, turn off transmitter in each R/T by placing XMTR switch to OFF.
(16)
At control panel, select NOR (NORM). Observe that antenna rotates in azimuth | 90 degrees about the zero degree (forward) position.
(17)
Place AZ (or SCAN DISABLE) switch on antenna to OFF, then carefully rotate antenna horizontally by hand to the zero azimuth (forward) position.
EFFECTIVITY
AT ALL; AZ ALL; LH ALL; CONFIG 1 AF 157, 161; IB 406-499 01 A Page 512 Sep 25/94
34-43-00
(18)
Place TILT control on control panel at 0-degree position and observe antenna is at 0 (| 1) degree position. Record reading of pitch indicator scale on antenna.
(19)
Rotate control panel TILT control and observe that antenna may be positioned from 14 degrees below recorded zero pitch position to 14 degrees above recorded zero position. Set TILT control at 0, |5, |10, and |14 degrees on control panel. Antenna position must correspond to the TILT control setting within | 2 degrees. Return TILT control to 0. position.
(20)
Set applicable INU tilt table for 20 degrees nose up and observe antenna points 20 | 2 degrees below the previously recorded zeroed position.
(21)
Set applicable INS tilt table for 20 degrees nose down and observe antenna points 20 | 2 degrees above the previously recorded zeroed position.
(22)
Set applicable INU tilt table for 20 degrees left roll and observe antenna is directed above zeroed position and tilted 20 | 2 degrees CCW as viewed from front.
(23)
Set applicable INU tilt table for 20 degrees right roll and observe that antenna is directed above zeroed position and tilted 20 |2 degrees CW as viewed from front.
(24)
Level applicable INU tilt table and observe antenna returns to centered position. On weather radar control panel, place STAB switch (if provided) to OFF position Pitch and roll gimbal scale indicators on antenna should read 0 | 1 degree due to fact that antenna should assume a horizontal position in reference to airplane boresight coordinates when pitch and roll stabilization from applicable INU is removed.
(25)
At weather radar control panel, select SYS 2.
(26)
Repeat stabilization tests for system 2. INS unit No. 2 supplies pitch and roll stabilization signals for weather radar system No. 2.
(27)
If no further use of the weather radar system is anticipated, adjust all BRT/BRIGHTNESS controls on indicators to minimum position and shut down radar system in accordance with procedures at end of Operational Tests.
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本文链接地址：747飞机维护手册AMM CHAPTER 34 - NAVIGATION 第34章导航3(130)
