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 B.  The weather radar operates in the X-band and has a penetration range through relatively light intervening rainfall to detect distant rainfall storm areas at ranges of up to 320 miles. The weather displays permit the pilot to avoid weather storms and the associated turbulence. Strong echoes may also return from other objects (such as mountains). All returns are displayed on the electronic horizontal situation indicator (EHSI).
 C.  The weather radar system presents the pilots with a topographic map type display of moisture laden weather formations 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 weather storms and the associated turbulence.
 D.  BEJ 061-112 The Collins weather radar system consists of a receiver/transmitter (R/T) unit, an antenna, waveguide and a control panel. Weather or map data is displayed on the EFIS electronic horizontal situation indicator. (EHIS) (Ref 34-22-00). Equipment location is shown in Fig. 1.
 E.  BEJ 113-999 The Collins weather radar system with predicative windshear consists of a receiver/transmitter (R/T) unit, an antenna assembly, waveguide and a control panel. In addition, various input modules provide the windshear provisions installed on the airplane. The weather radar system receives control data from the electronic flight instrument system (EFIS) control panel. Weather or map data is displayed on the EFIS electronic horizontal situation indicator (EHSI) (Ref 34-22-00). Equipment location is shown in Fig. 1.
 F.  Visual display of hazardous weather conditions or a display of the terrain ahead of the airplane, is presented on the EHSI's. 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 antenna, processed by the R/T unit, and displayed on the EHSI. 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 (IRS).
 G.  The receiver/transmitter and associated waveguide is accessible through the lower access door, forward of the nose wheel well. The antenna and associated waveguide components are accessible by opening the nose radome.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

 34-41-02
 ú ú 04A Page 1 ú Nov 15/95

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

Weather Radar System Component Location
Figure 1 (Sheet 1)

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 34-41-02

 ú ú 11A Page 2 ú Nov 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
F44564
A 737-300/400/500MAINTENANCE MANUAL
WEATHER MODE MAP MODE
GAIN CONTROL (MAP MODE ONLY)

(MOMENTARY) (MOMENTARY) TEST MODE WEATHER+TURB MODE
ANTENNA

(MOMENTARY) (MOMENTARY)

GROUND CLUTTER SUPPRESSION (MOMENTARY) TILT CONTROL
ANTENNA STABILIZATION (LATCHING)

CONTROL PANEL ELECTRONIC HORIZONTAL

B
SITUATION INDICATOR
C
MODE SELECTOR

RANGE SWITCH
WXR POWER SWITCH

EFIS CONTROL PANEL

D

Weather Radar System Component Location
Figure 1 (Sheet 2)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

 34-41-02
 ú ú 27A Page 3 ú Nov 15/95

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
F44393
A 737-300/400/500MAINTENANCE MANUAL
VHF NAV IRS

RECEIVER/ TRANSMITTER IRS SELECT SWITCH
ANTENNA FLAT PLATE RADIATOR

AIRPLANES WITH EFIS  ú  34-41-02
 ú
 ú  07A  Page 4
 ú  Jul 15/98 

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