ROLL
115V AC

INS 1 SYNC 1 29 RAD NAVDR304 AS 4 17 Y

22-10-00
STBY BUS

DR304 30
DISPLAY SYS 1
B302 3 16

Z A34
C796 B34 31 2
8D
HMHRS-1 C34

4 9 29
CDB109E DB109E 5 XAC26V AC 15HX X XX 10 1262 B13 SYNC 2 1 YSTBY BUS 1 Y A13Y 1 Y MAG HDG 7 16CX 63 B28 Y 12 ACC278 C 2ZA28 33-11-002Z Z Z 17 NC ACAC DISPLAY SYS 1Z 1364 B29PLATF 3C2A29 DCX H 19

42HDG INS 1 C13HDG VALID 6526V AC C H 26V ACY

B303 CMPS CONT 2
AC43 18C28

ESS FLT 22V DC Z X
28V DC
INST BUS C576

(P5)C SYNC 3 39C29 MAG HDG 7YDB108 40B35 Z DISPLAY SYS 2HDG SYNC EXCIT 2 B109 INS 1 NAV 14A35 SAME AS 41
DB106 DB108 TEST
HUNIT (E2-6) C35 1313 B10326V AC

47

AC 1
FLT INST B30

C
105 14 XZ10

SAME 5 8SAME A
BUS 2

XC280

10 RAD NAV C30
SYNC 4
AS7 9AS
Y4PLATF HDG INS 3 11 DISPLAY SYS 2

B105 3 1B107 Z 113 12 3
23 H Z
CPT ALT26V AC

DB104B 51
STBY BUS

CB DB173E 1 2

(INS 3) 4
AC 1 A30 X
57 52C733 Y

6 MAG HDG

SAME 56 SYNC 5 48HDG SYNC EXCIT 1
X
AS

Y
26V AC

62 B106 MHR 2 5 55 49 DISPLAY
Z63 FLD SENSOR 12 50 SYS 1 AND 2B109 34-41-08STBY BUS CDB173E 64 (RIGHT DC 24F/O ALT (INS 3)C1113 R304 CAPT ATTD/CMPS H

C
65 STBLN RLY (P73)

2 WING TIP) B108 MHR 2AC 23ALT PLATF XCOMP (E1-1)DR305
SYNC 6 20 X
HDG INS 3
Y
B173 INS 3 NAV UNIT

DR30521C13 X X Z 1 C AND H REVERSED TO PROVIDE CORRECT

Y
(E2-6)

26V AC
A13 25
22C28 Y Y C INDICATOR OPERATIONZFLT INST

A28 26
38A C29 Z ZHBUS 2 C732 A29 27 37 2 ALSO REFERENCE MAG HDG DISPLAY SYS 1

X
D
DB110E SYNC 8 34HDG SYNC EXCIT 3 A/P-F/DYXX C34DB110E 62 B1326V AC DB104C 35 3 ALSO REFERENCE MAG HDG DISPLAY SYS 2

ROLLY ZHY

FLT INST 63 B28 30 36B341XSAMEZ Z
4 XZ9 AND XZ10 EFF FOR AF ALL; AZ ALL EXCEPT 226,234, AC
BUS 2 C279 64 B29 15C A34 22YAS2 236, 231 GN ALL; LH ALL EXCEPT 014,015,063, MD ALL; VM ALLPLATF HDG INS 2 16ZB109 C35115V AC A35 57 SYNC 7 17NC
C 5 ON LH 014,015,063 SUPPLIED BY C733 26V AC STBY BUSFLT INST 65 B35

19
BUS 2 C797

6 H 26V AC

18
MHRS 2 NORM (INS 2) 28V DC

B110 INS 2 NAV 7
UNIT (E2-6)
B104 MHR 2 CMPS CPLR (E1-1)

P7 R305 F/O ATTD/CMPS STBLN RLY (P73)
Magnetic Heading Reference System Schematic
Figure 4 (Sheet 1)

EFFECTIVITY
XA ALL EXCEPT AF 101-116; 799 Page 15/16IB 405; LH 001-010; AT ALL Aug 25/87
34-21-00

SYNC ANNUN
DB103C
DB302 DB103C
AC
7
POLARITY
MAG HDG
STEPPER
+

6 9 ANNUNCIATOR DETECTOR
55
DISPLAY SYS 1

ANNUN
-
MOTOR
7 8 DEMOD
DB103B SHEET 4 AND B

AMPL
OFF LOW RATEMATRIX RES DIODE CW CCW DG SLAVED HDG SET B302 COMPASS CONTROLLER 1  10 9 8 3 4 1 2 5 11 13 12  34-11-00 DC  XZ9 HEADING MAGNETIC 5  DB103B 5 3 29 12 Y Z X DB103B 56 17 14 15 33 16 55 57 H C CT -12V DC FV SET CONTROL HEADING  ISOLATION AMPL MAGNETIC DG CONTROL SLAVE/  WAVE REFERENCE 800 HZ SQUARE MOD FILTER GENERATOR DEMOD  AMPL ERROR HDG  FREQUENCY LIMITER CONTROL AND CONVERTER FREQUENCY VOLTAGE TO  STEPPER MOTOR CONTROL  CDX  1 672 DATA INS HDG  RATECT MONITOR CONTINUITY NULL AND SERVO CT  SERVO AMPL SERVO 1 2 3  H Z Y C X H Z Y C X Z Y H C X  32 41 40 39 43 42 31 30 29 3 2 1 5 4 33  SHEET 4 AND B SYS 1 MAG HDG DISPLAY SYS 2 DISPLAY 34-31-00 SYS 2 RAD NAV DISPLAY 3 MAG HDG AC AC AC 1 B A 
(P5)  TEST POINTS  N-S E-W  POINTS TEST DB107 14 13  DC AC  6 1 2 30 22  POWER AND HDG PWR OFF SWITCHING  MONITOR EXCITA-TION SENSOR FIELD  CONTROL FAST SYNC  CONTROL GAIN DETECTOR ERROR  MONITOR CONTROL SUPERFLAG  442  1 4  H Z Y C X H C X  52 51 12 11 10 14 13  AC AC  1  34-31-00 SYS 1 RAD NAV DISPLAY 2 C 
DB105 H 4 5C  DB107 7 8  |6.8V DC PWR SUP  12 10 11  H C  DC  27 26 25 DB103B 57 Y X Z  SENSOR  SENSOR VALID INS  FLAG MAINT  FLAG CONTROL MAINTENANCE  5  Y X Z Y C H  20 23 24 50 49 48  SHEET 4,7,8 SYS 1,2 MAG HDG DISPLAY 
7  9  6  Z  21 
BUS 2 FLT INST 26V AC 22V DC INS 3 PLATF HDG 115V AC FLT INST BUS 2 MHRS 2 C797 BUS 2 FLT INST 26V AC HDG SYNC EXCIT 3 C732 ALT PLATF C1113 HDG INS 3 INST BUS ESS FLT 26V AC BUS 2 FLT INST 26V AC HDG INS 2 C279 PLATF 1 2 DB110E C280 DB110E Y Z X 64 63 62 65 22V DC DB173E 2 65 1 62 64 63 DB173E SNSR (LEFT WING TIP) B105 MHR 1 FLD B107 MHR 1 COMPENSATOR (E1-1) Z X Y 3 2 1 3 21 X Y Z 5 4 6 PLATF MHRS-1 C796 115V AC STBY BUS CX 1 2 H C 22V DC HDG VALID 65 64 63 62 DB109E DB109E HDG SYNC EXCIT 2 C576 HDG INS 1 C278 INST BUS ESS FLT 26V AC STBY BUS 26V AC Y Z X 4 4 A C 26V AC STBY BUS C733 HDG SYNC EXCIT 1 B AC AC AC B110 INS 2 NAV UNIT B173 INS 3 NAV UNIT (E2-6) B109 INS 1 NAV UNIT (E2-6) AS B109 SAME B109 AS SAME  (INS 1) X Y Z 15 14 13 DR305A DR305A 16 1 4 7 13 10 12 11 18 17 3 6 9 X Y Z 2 5 8 X Y Z 14 15 Z Y X DR304A 12 11 10 DR304A Y X Z X Y Z 1 4 7 R304 CAPT ATTD/CMPS STBLN RLY (P73) INS 3 INS 3 (INS 2) 3 6 9 PLATFORM HEADING 2 5 8 B103 MHR 1 CMPS CPLR (E1-1)  DC  57 56 55 DB104B 22 30 Z Y 27 26 25 X DB104C 57 5 DB108 7 3 8 9 1 2 13 14 TEST DB108 B108 MHR 2 COMP (E1-1) 10 B107 AS SAME D 6 B105 AS SAME AS SAME B302 DB303 D 2 5 2 9 DB104C 8 33 16 15 14 17 29 12 1 DB106 4 5 7 3 2 1 11 3 4 5 1 7 6 DB303 13 12 10 9 8 B303 CMPS CONT 2 (P5) DC 4 6 5 12 XZ10 Y X Z 33-11-00 B106 MHR 2 (RIGHT WING TIP) AC DC FLD SNSR  SAME AS B103 SYNC 4 HDG FLAG 28V DC SYNC 5 SYNC 3 SYNC 2 SYNC 1 SYNC 8 SYNC 6 SYNC 7  SYS 2 MAG HDG DISPLAY 3 2 SYS 1 AND 2 SYS 2 SYS 1 SCHEM ROLL A/P-F/D SYS 2 SYS 1 AC 1 DC 1 55 C A DB104C 7 17 NC 49 48 52 51 37 20 21 22 38 34 23 24 DB104B 32 31 30 29 33 3 2 1 5 4 41 40 39 43 42 12 11 10 14 13 50 36 35 15 16 19 Z Y C X Z Y C X H Z Y C X H Z Y C X H Z Y C X C Z Y X H Z Y X C H H X Y Z C H AC AC AC AC 7 18 28V DC 26V ACH RAD NAV DISPLAY MAG HDG DISPLAY MAG HDG DISPLAY RAD NAV DISPLAY MAG HDG DISPLAY AC  1 2 3 4 5  AC 22-10-00 22 36 35 34 37 38 A/P-F/D ROLL NC 26V AC Z Y X 8 C H 18 7 28V DC 15 16 17 19 Y X Z C 7 H C AND H REVERSED TO PROVIDE CORRECT INDICATOR OPERATION ON AT ALL, C280 IS CONNECTED TO 26V AC XZ9 AND XZ10 EFF FOR AF 101-116 ALSO REFERENCE MAG HDG DISPLAY SYS 1, FLT INST BUS 2 C1113 CONNECTED ALSO REFERENCE MAG HDG DISPLAY SYS 2, 
　
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