F/O EHSI 1) EADI EUROPEAN FORMAT (FMA AT TOP) 2) SINGLE CHANNEL ANNUNCIATION3) FD 1 OR FD 2 SELECT
L-EFIS SG INPUTS USED FROM:
 A. MCP-1 BUS
 SEL CRS NO. 1 (DEFAULT)
 SEL HDG (DEFAULT)

 B. FCC-L BUS
 F/D ON/OFF
 F/D PITCH/ROLL

AIRSPEED BUG DRIVE
 A/P MODES & STATUS
 LOC - G/S DEV WARN
 SEL HDG
 SEL CRS NO. 1

EFIS Symbol Generator - FCC/MCP Inputs
Figure 13

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A

737-300/400/500
MAINTENANCE MANUAL

AUTO THROTTLE EFIS SG - RIGHT
COMPUTER
SIGNAL TYPES:  A/T DIGITAL DATA BUS - LO-SPEED ARINC 429 A/T INSTALLED AND THROTTLE HOLD - ANALOG DISCRETES
EFIS Symbol Generator - Autothrottle Computer Inputs
Figure 14

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A 737-300/400/500MAINTENANCE MANUAL
28V DC 
STBY BUS  ADF-1 ON 
ADF-1 DC  ADF CONT  ADF-2 ON 
PNL-1 
ADF-1 
115V AC  BEARING 
STBY BUS 
ADF-1 DC 
ADF-1 EXC  26V AC 
P18-1 CB PANEL  XFMR  REF-1 
ADF-2 
BEARING 
ADF BEARING 
26V AC 
REF-2 
26V AC REF  PROGRAM 
PIN 
OPTIONS 
ADF POWER 
EFIS SG - LEFT 
ADF RCVR 1 
28V DC 
STBY BUS 
2  ADF-2 DC 
ADF CONT 
PNL-1  26V AC 
REF-1 
ADF-2 DC2 STBY BUS 115V AC  REF-2 26V AC 
ADF-2 EXC 
P6-1 CB PANEL  XFMR  ADF-1 
BEARING 
ADF BEARING  ADF-2 
BEARING 
26V AC REF 
ADF-1 ON 
ADF POWER  ADF-2 ON 
PROGRAM 
ADF RCVR 2  PIN 
OPTIONS 
SIGNAL TYPE:  ADF BEARING - SYNCHRO 
ADF 1 ON - DISCRETE  EFIS SG - RIGHT 
ADF 2 ON - DISCRETE 
PROGRAM PIN OPTIONS: 
1) ANALOG OR DIGITAL ADF 
2) 1 OR 2 ADF SYSTEMS 
3) ADF POINTER IN MAP & PLAN 

ADF POINTER (VOR & ILS MODES) ADF VECTOR (MAP & CTR MAP MODES)
CAPT EHSI
ADF POINTER (VOR & ILS MODES) ADF VECTOR (MAP & CTR MAP MODES)
F/O EHSI

EFIS Symbol Generator - ADF Inputs
Figure 15

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A
737-300/400/500MAINTENANCE MANUAL
 (3)
ADF-1 bearing analog signal

 (4)
ADF-2 bearing analog signal

 (5)
26V AC ADF-1 reference signal

 (6)
26V AC ADF-2 reference signal

 B.  When the EHSI is displaying VOR/ILS data, bearing to the ADF station, tuned on the ADF control panel, will be represented by ADF pointers.
 C.  In the MAP mode, the display of ADF bearing can be enabled by the VOR/ADF map mode display switch. In this mode, the bearing to the ADF station, tuned on the ADF control panel, will be represented by ADF vectors and identifiers.
 21. EFIS - Ground Proximity Warning Computer Interface (Fig. 16)__________________________________________________
 A.  The ground proximity warning computer provides a windshear alert discrete to the symbol generators. The windshear alert is displayed on both EADIs.
 22. EFIS - Symbol Generator Selection (Fig. 17)_________________________________
 A.  Information from each symbol generator can be displayed on the captain's or first officer's display units. The source of the information to the display units is controlled by the EFIS transfer switch (EFI transfer switch).
　
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