THE FAR TARGETS DO NOT SHOW - Replace in sequence:
(1)
R/T Unit (AMM 34-41-41/401)
(2)
Antenna (AMM 34-41-11/401)
(3)
Waveguide (AMM 34-41-21/401).
NOT MANY OR MISSING MIDDLE RANGE TARGETS - Replace R/T unit (AMM 34-41-41/401).
(2) Antenna (AMM 34-41-11/401). (1) R/T Unit (AMM 34-41-41/401) Replace in sequence: THE NEAR RANGE TARGETS ARE MISSING -
INT CONTROL DOES NOT CHANGE DISPLAY
THE RED AREA OF THE DISPLAY DOES NOT GO BRIGHTNESS - Replace the indicator
OUT OF VIEW (ONCE PER SECOND) IN THE (AMM 34-41-51/401).
CYC MODE - Replace the indicator (AMM 34-41-51/401).
SEC SCAN, TGT ALRT, AZIM, OR FRZ
THE ALPHANUMERICS (RANGE MARKS, MODE FUNCTIONS DO NOT OPERATE - Replace
FIELDS, COLOR BAR) ARE NOT THERE/NOT indicator (AMM 34-41-51/401).
CORRECT - Replace the indicator (AMM 34-41-51/401).
SYSTEM SELF-TEST IS OK.
Weather Radar Trouble Shooting Procedures
Figure 102 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT EFIS ú
34-41-00
ú ú 11 Page 106 ú Mar 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
Weather Radar Trouble Shooting Procedures
Figure 102 (Sheet 2)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT EFIS ú
34-41-00
ú ú 06 Page 107 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
WEATHER RADAR SYSTEM - DESCRIPTION AND OPERATION
________________________________________________
1. General_______
A. The weather radar system presents the pilots with a topographic map type of display of moisture laden weather formations (WX) or major terrain features such as rivers, coastlines, major mountain peaks, and cities for position fixing (MAP). The weather displays permit the pilot to avoid, if possible, storm penetration and the associated turbulence.
B. The basic weather radar system consists of a receiver/transmitter (R/T) unit, an antenna assembly, a waveguide, a dummy load, and an indicator control unit (Fig. 1). The controls on the indicator allow the crew to select various modes of weather radar operation depending upon the type of video data desired. The indicator's main function is to give a visual display of potential weather turbulence or a display of the terrain ahead of the airplane, at various ranges, as well as on either side. The receiver/transmitter generates and transmits high energy radio frequency (rf) pulses which are radiated by the antenna. A small portion of the radiated energy is reflected back to the airplane by moisture laden clouds or by major terrain features. The reflected signals are received by the same antenna, processed by the R/T unit and displayed on the indicator. The transfer of the RF energy between the R/T unit and the antenna takes place via the waveguide. Stabilization of the antenna in pitch and roll is provided by the inertial reference system.
2. Indicator_________
A. The weather radar system indicator unit is a high resolution color indicator which displays weather, operating mode, and fault information on a 5-inch CRT. The CRT uses an X-Y raster scan.
B. The indicator control panel contains pushbutton mode selector switches, rotary TILT, GAIN, and INT control knobs, rotary RANGE and STAB selector knobs, and pushbutton AZIM, SEC SCAN, FRZ, and TGT ALRT switches (Fig. 1).
C. The radar returns are presented in four colors. In the WX (Weather) and CYC (Cyclic) modes, the colors are: dark, no Returns; green, least Returns; yellow, medium Returns; red, maximum Returns.
D. During MAP mode, the color presentation is: dark, no Returns; cyan (bluish), least Returns; yellow, medium Returns; magneta (reddish purple), maximum Returns.
E. The color bar legend is displayed in the auxiliary field in the upper right corner of the display tube.
F. The indicator uses digital circuits, integration/averaging, and memory storage to provide a low noise non-fading display. The digital display is refreshed at a 60.7 Hz frame rate by video information stored in memory. The solid state memory holds the image between sweeps, with the data sweep displayed on the CRT moving in synchronism with the antenna's scan.
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