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 6.  Electronic Attitude Director Indicator (EADI) (Fig. 3)
_____________________________________________
 A.  The Electronic Attitude Director Indicator (EADI) provides a multicolor display of airplane attitude, flight director commands and various other data.
 B.  The EADI weighs 23 pounds (10.8 kg). The EADI dimensions are 6 x 5.5 x 14 in. and the display area on the EADI CRT is 4.7 x 4.2 in.
 C.  One inlet hole and one exhaust hole, each covered with a wire mesh screen, are located at the rear of the EADI. These holes provide passage for cooling air from the equipment cooling system.
 D.  An inclinometer is mounted on the EADI to display airplane's lateral acceleration.
 E.  The principle systems that provide data to the EADI include: IRS, VOR/ILS, FMCS, ADC, radio altimeter, autothrottle, and autopilot.
 F.  The EADI has only one basic display mode, in which data from various airplane systems are displayed on the CRT.
 G.  EADI Fault Displays (Fig. 3A)
 (1)  
When a specific input to the symbol generator becomes invalid, the symbol or data value associated with it on the EADI is blanked. In most cases, a yellow fault flag is also displayed, in place of the invalid symbol or data (Fig. 3).

 (2)  
When the status of a data source, for any given symbol or data value, changes from valid to NCD (no-computed-data), the symbol or data value normally blanks, or is replaced by a series of dashes.

 7.  Electronic Horizontal Situation Indicator (EHSI) (Fig. 4)
_________________________________________
 A.  The Electronic Horizontal Situation Indicator (EHSI) provides a multicolor display of various navigational and weather radar data.
 B.  The principle systems that provide data for display on the EHSI include: VOR/ILS, DME, ADC, FMCS, IRS, weather radar, FCC, and ADF.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
CONN PIN PIN CONN
D05
B
A03
B
E05
B
B03
B
F05
B
A 737-300/400/500MAINTENANCE MANUAL 
EFIS HEX CODE BIT ASSIGNMENT 
FIRST LINE 
HEX BINARY 00000 1 0001 00102 3 0011 

LEFTMOST DIGIT  RIGHTMOST DIGIT  8  1000 
9  1001 
A  1010 
B  1011 
C  1100 
D  1101 
E  1110 
F  1111 
SECOND 
LINE 

LEFTMOST DIGIT  RIGHTMOST DIGIT 
NOTES:_____ 
PIN GROUNDED = 1 
PIN OPEN = 0 
NU = 0 
Program Pin Options 
Figure 2A (Sheet 1) 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C03
B
G05
B
D03
B
G14J05K05D07
G10G02H02E06

F06G06H06D12
A13B13D12A13
B31K13C14
ABBB
BBBB

BBBA
AADD
DDD
E03F03D12E12
J03K03A04B04

E04F04C02D02
D09E11F11F09
G09D10E10D11
BBBB
BBBB

BBBB
BBBB
BBBB
B02
B
J06
B
G12
B
E08
B
H03
B
J02
B
E09
B
C05
B
6 0110 7 0111 4 0100 5 0101

A 737-300/400/500MAINTENANCE MANUAL
EFIS HEX CODE BIT ASSIGNMENT

CONN PIN
LEFTMOST DIGIT
NOTES: PIN GROUNDED = 1 PIN OPEN = 0 NU = 0
RIGHTMOST DIGIT
7 0111 8 1000 9 1001 A 1010 B 1011 C 1100 D 1101 E 1110 F 1111

THE THIRD HEX LINE SHOWS FOR -420 EFIS SGs AND ON
Program Pin Options Figure 2A (Sheet 2)
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