34-31-02
ú ú 07 Page 46 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú
34-31-02
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
VHF NAV-1 VOR/ILS
AB
C
DE
M1474 INTEGRATED FLT SYS ACC UNIT (E1-3)
F
G
VOR/LOC S FLAGTO RDDMI(FIG. 13) M154 VHF NAV UNIT-1 (E3-4)
AIRPLANES WITH THE INTEGRATED FLIGHT SYSTEM ACCESSORY UNITAIRPLANES WITH THE FLIGHT INSTRUMENT ACCESSORY UNIT
NO. 1 VOR/ILS SYSTEM
VOR/ILS Tuning and Mode Select Schematic
Figure 11 (Sheet 2)
FIG.9
FIG.9
P8-26 VHF NAV-2 CONTROL PANEL (P8)
1 DISPLAY TEST VALUES SHOWN (TWO SECONDS ON, ONE SECOND OFF)
VOR/ILS Tuning and Mode Select SchematicFigure 11 (Sheet 3)
AGILITY MODE
A
FREQ SEL COMMON
VHF
B
NAV
DME (34-55-00)
AUTO TUNE
CNC
NC AUTO TUNE
D
AUTO TUNE FREQ COMM
E
10 MHz
1 MHz
NC
MHz0.1
MHz 0.05
10 MHz
DME AND VHF1 MHzNAV TUNING F
MHz0.1
MHz 0.05G/S LOC ENGAGE
G
VOR TESTUP/LT TEST
FMSINTERLOCKFIG. 15 DN/RT TEST
DME TESTCHASSIS GND
A 737-300/400/500MAINTENANCE MANUAL
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú
34-31-02
ú ú 06 Page 48 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú
34-31-02
ú ú 06 Page 49 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
VHF NAV-2 VOR/ILS
A
B
22
K11AUTO TUNE DISCRETED2179B
AUTO TUNE VOR/LOCC
A15
M1175 FMC (E1-2)
D1661AD42AUTO TUNE SELECT
M923 FLT CMPTR B (E1-3)E
D169B
VOR/LOC S FLAG
29 AGILITY DME
TO RDDMI(FIG. 13)M165 DME-2 (E2-2)
D2167A
J15 AUTO TUNE ENABLE
K4 AGILITY MODE GND
G4 COMM TUNINGM1474 INTEGRATED FLT SYS ACC UNIT (E1-3)
J1-J14
F
M1164 DAA-2 (E1-2)
G
D359B
15COMMON
1,210 MHz
3-71 MHz
8-120.1 MHz
13,14 0.05 MHz
ILS RELAY18
(FIG. 9)
M155 VHF NAV UNIT-2 (E3-4) AIRPLANES WITH THE INTEGRATED FLIGHT SYSTEM ACCESSORY UNITAIRPLANES WITH THE FLIGHT INSTRUMENT ACCESSORY UNIT
NO. 2 VOR/ILS SYSTEM
VOR/ILS Tuning and Mode Select SchematicFigure 11 (Sheet 4)
A
737-300/400/500MAINTENANCE MANUAL
(9) VOR Audio, Bearing and Course Select Schematic (Fig. 12)
(a) Fig. 12 shows the VOR audio, bearing and course select signal interface with the DAA units, the RDDMI's, and the DFCS mode select panel. 1) The navigation units normally receive magnetic heading from
heading repeater synchro transmitters in the RDDMI's. Navigation unit No. 1 receives magnetic heading from the captain's RDDMI while the first officer's RDDMI supplies magnetic heading to navigation unit No. 2.
2) The VOR bearing sine and cosine outputs from navigation units No. 1 and 2 are connected directly to DAA 1 and 2 respectively.
3) Course selection is controlled by the left and right COURSE select knobs and counters in the DFCS mode select panel. The DFCS course select circuits are connected directly to the navigation units. Each knob drives a course counter and positions the rotors of a synchro resolver in the mode select panel. The resolver rotors receive 26 volts ac inputs from the navigation unit to provide bearing sine and cosine outputs to the navigation unit. The sine and cosine inputs are used by the navigation units to compute the VOR deviation and to/from outputs. The to/from outputs of the navigation units are not used. The EHSI VOR to/from display is generated by the EFIS (AMM 34-22-00) and initiated in the FMCS (AMM 34-62-01).
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