(b)
Check CAPT and F/O INST SW RELAYS ATTD comp STAB circuit breakers on electronic circuit breaker panel P7 are closed.
(c)
Check INS-1 and INS-2 are in ALIGN or NAV mode (Ref 34-41-00).
(d)
Position ATT/COMP STAB switches on captain's main instrument panels to CAPT 1 F/O 2.
(e)
Position the controls and switches on the weather radar control panel as follows: 1) AF 160, 162-171;
Mode select switch - WX, WX+T, or MAP 2) AF 183, 184;
Mode select switch - WX, MAP, or SCH 3) System transfer switch - 1 4) TILT control - 0 5) AF 160, 162-171;
GAIN control - CAL
6) AF 183, 184;
GAIN control - 12 o'clock
7) AF 160, 162-171;
GND CLTR SPRS - OFF
8) AF 813, 184;
GND SPR - OFF
(f) Position controls on indicator No. 1 or 2 as follows: 1) AF 160, 162-171;
PWR - on (depressed) 2) MKR intensity control - midposition 3) INT control - midposition 4) Range switch - 80 5) M/S switch - master mode position 6) AF 160, 162-171;
AZ switch - off
EFFECTIVITY
AF 160, 162-171, 183, 184 CONFIG 4 01 Page 11 Sep 25/9434-43-00
7) AF 160, 162-171;
HOLD switch - off
8) FWD switch - pressed
(2)
The R/T unit will generate the RF pulses for transmission and send them to the antenna through the waveguide. The reflected RF is returned to the R/T for processing.
(3)
The video signal received by the radar receiver is digitized and fowarded to the navigation displays in binary format.
(4)
In the WX mode, normal weather returns are displayed in green, yellow and red at all ranges.
(5)
AF 160, 162-171; In the WX+T mode, normal weather returns are displayed in green, yellow and red at all ranges with the turbulence returns within 50 miles displayed in magenta.
(6)
AF 160, 162-171; In the SCH mode, normal weather returns are displayed in green, yellow and red at all ranges. Higher rainfall intensity than red returns with 20 or 40 mile ranges selected are displayed in magenta.
(7)
In the MAP mode, prominent terrain features are displayed in green, yellow and red.
(8)
AF 160, 162-171; Electrical Power and Power Control Circuits (Fig. 3, Sheets 1 and 2)
(a)
The weather radar indicators and receiver/transmitters receive single-phase, 400-Hz, 115-volt ac power through circuit breakers on circuit breaker panel P7. The antenna receives 115-volt ac power from the R/T selected.
(b)
Closing the R/T 1 circuit breaker sends a 28-volt dc interlock power signal from R/T No. 1 keep alive power supply to the control panel SYS transfer switch. With the SYS transfer switch in position 1 the 28-volt dc signal goes through the waveguide switch to R/T No. 1 switch S1. The 28-volt dc signal goes through relay to R/T 1 switch S1 that controls the operation of R/T relay K1. When the captain's or first officer's indicator PWR switch is depressed a ground signal is supplied through R/T No. 1 or No. 2 switch S1 to energize the K1 relay. These indicator signals are ON/OFF 1 from the indicators to R/T 1 and ON/OFF 2 from the indicators to R/T 2. Energized R/T No. 1 relay K1 sends 28-volt dc operating power to the control panel and 115-volt ac switched power to antenna system No. 1 circuits and to R/T No. 1. When R/T No.1 is selected on the control panel, a discrete ground is sent to R/T No. 2 to prevent transmission.
(c)
When the No. 2 weather radar system is selected with the SYS transfer switch in the 2 position, the 28-volt dc interlock power to the R/T No. 1 is removed and a ground is applied to prevent transmission.
EFFECTIVITY
AF 160, 162-171, 183, 184 CONFIG 4 01 Page 12 Sep 25/9434-43-00
B138 WAVEGUIDE SWITCH B138 WX RECEIVER/TRANSMITTER NO. 1 (E5 FWD EQUIP CTR - RIGHT)
Weather Radar System Schematic (P/O R/T MOUNT)
Figure 3 (Sheet 1)
EFFECTIVITY
CONFIG 4 AF 160,162-171
799 Page 13/14
34-43-00
Sep 25/94
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