747飞机维护手册AMM CHAPTER 34 - NAVIGATION 第34章导航3(118)

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 NOTE: In some instances, to gain access to the R/T front panels for
____ observation of fault indicators/annunciators, a walkway/dripshield panel located over the R/T units must be removed.
 D.  When the TEST mode is selected, all parts of the system are energized, a test pattern appears on the indicators, and RF from the R/T in use is directed into a dummy load instead of the antenna. In the TEST mode, the following events also occur in addition to the special test signal display on the indicator:
 (1)  Status of fault monitor circuits (except VSWR monitor) is displayed on the indicator as presence or absence of video test bands.
 E.  The fault indicators/annunciators, located on the R/T front panel, are designated T/R (or R/T), ANT, and (if provided) VSWR. If a malfunction occurs in a LRU (line replaceable unit), a fault indicator should illuminate (or trip) and the faulty LRU can be determined.
 NOTE: When more than one fault lamp comes on at the R/T unit, the R/T
____ should be replaced first since it is more accessible than the antenna. Selecting the alternate system at the weather radar control panel and observing the fault lamps aids isolation of a fault to a specific LRU. See Trouble Shooting Chart.
 (1)  Receiver-Transmitter Fault Indicator (T/R or R/T)
 EFFECTIVITY AF 101-120, 123-156, 158, 
 159, 172-182, 185-199;  SN 301-350; IB 405; GN ALL; CONFIG MD ALL; VM ALL  05 C Page 101
   Sep 25/94

34-43-00
 (a)  If the TR (or R/T) fault indicator is on, it is an indication that there is a failure or out of tolerance condition in the transmitter, receiver, or power supply. It is also an indication of rf leakage or a malfunction of the pitch, tilt, or roll stabilization circuitry.
 (2)  Antenna Fault Lamp (ANT)
 (a)  Antenna sensors, or mechanical conditions which lead to either sluggish or oscillatory antenna motions can be rapidly detected. If the system is in the TEST mode, video test bands will disappear and the ANT and T/R (or R/T) lamps will illuminate if a fault occurs within azimuth axis rotation and position sensor, tilt axis rotation and position sensor, pitch resolver or roll axis rotation and position sensor.
 F.  Antenna stabilization faults
 NOTE: Stabilization problems may occur as the result of an improperly
____ mounted weather radar antenna. For correct operation, the antenna must be oriented to allow tracking of the INS (vertical) gyro pitch and roll signals within one degree. Alignment of the antenna support assembly is not necessary when simply replacing the antenna because it is accomplished at the time of manufacturing by the use of shims on the antenna support assembly.
 2.  Prepare for Trouble Shooting____________________________
 A.  Check that WEA RDR RT1, RT2, IND1, and IND2 circuit breakers on overhead panel P7 are not flagged with Do-Not-Operate identifiers.
 EFFECTIVITY
 AF 101-120, 123-156, 158,

 159, 172-182, 185-199;  SN 301-350; IB 405; GN ALL; CONFIG MD ALL; VM ALL  05 C Page 102
   Sep 25/94

34-43-00
 B. Observe the following precautions when operating the weather radar

 system.
 WARNING: DO NOT OPERATE WEATHER RADAR WHILE THE 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 THE WEATHER RADAR IS OPERATED IN ANY MODE OTHER THAN
_______ STANDBY AND TEST, DIRECT THE NOSE OF THE AIRPLANE SO THE FORWARD 180-DEGREE SECTOR IS FREE OF LARGE METALLIC OBJECTS (HANGARS, TRUCKS, OTHER AIRPLANES, ETC.) FOR A DISTANCE OF 300 FEET AND TILT THE ANTENNA UPWARD 14 DEGREES OR DAMAGE TO RECEIVER MAY OCCUR.
 DO NOT OPERATE WEATHER RADAR IN TEST MODE UNLESS AIRPLANE ATTITUDE REFERENCE SYSTEM (INU-1 AND 2) HAS ATTAINED AT LEAST COARSE ALIGN STATUS AND IS PROVIDING VALID STABILIZATION SIGNALS. THIS IS TO PREVENT ANTENNA FROM BUMPING REPEATEDLY AGAINST STOPS.
 C.  Place weather radar control panel controls in the following positions:
 NOTE: On the R/T's the MOD OFF/ON switch (used to disable the
____ transmitting circuits at the R/T) is set to ON position automatically when the control panel mode switch is set to OFF or STBY.
 (1)
Mode function selector switch - OFF

 (2)
Systems (R/T) transfer selector - 1

 (3)
Antenna Tilt - 14 degrees up

 (4)
GAIN control - midposition

 D.  Place controls on both weather radar indicators in following positions:
　
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