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31  Z' 
1  C & H, X & Y INTENTIONALLY  NO. 1  16  H 
2  ON AT ALL, POWERED FROM C730 RMI 2 CORRECT INDICATION REVERSED TO PROVIDE  8 9 DR306B  DR306B 7  60 DB179B  41  14  B60 DB180  C42  DB578E  DB181B 41  14  33 DN133  AC 16  AC  4  C33 N132 CAPT RMI (P1) 
4 5 6 7 3  Magnetic Heading Reference System Schematic ON AT ALL, F/O VOR RMI (P3) ON AT ALL, CAPT ADF RMI (P1) ALL EXCEPT R301 AIDS PROVISIONS FOR IB RA585 B179 A/P-F/D A ROLL CMPTR (E1-4) ON AT ALL, POWERED FROM C1107 ALT RMI 2 NO. 2 R306 CAPT CMPS XFR RLY (P73)  B180 A/P-F/D B ROLL CMPTR (E1-5)  B578 FDAU (E3-3) 1 2 Z 3 Y X 4 7  B181 A/P-F/D C ROLL CMPTR (E1-6)  SAME AS N132 N133 F/O RMI (P3)  INTERNAL CIRCUITRY SHOWN SAME AS N132 X Y Z H HDG VALID 26V AC RMI POWER18 N164 F/O ADF RMI (P3) 1 2 3 36 + -5 DN164  7C 37 DN164  AC DC 
Figure 4 (Sheet 4) 

EFFECTIVITY

AF 101-116,151; IB 405;
SN 301,302; AT ALL 7XA Page 21/22

34-21-00

 Aug 25/87

26V AC628V DC DR298 VOR/ILSNO. 2 DR307 DC DR298 DN1255 180` BIASA1 FLT INSTFLT INST DB231 C37SHEET 34 A45 POWERA37 B40 AC729 SIGNALBUS C744COMPASSBUS 2 A44 834-41-00 B37 SUPPLYB41ACF/O FLT CAPT 2-F/O 2 HSI 2A43

7

INST SW CAPT 1-F/O 2 (P7) BDR307 C
RLYS COMP CAPT 1-F/O 1 A42 C25CKT B231 INSTR SW ACCESS DC VOR ILS/INS ANNA25 A31326V AC A41 INTRPT MAG/TRUE ANNBOX (P73) NC B252 B48FLT INST 1 XDB195EC26C730 C1BUS 2 B31A26 YVOR B26 B32C5S606 CAPT CMPS SW (P1) ZXRMI 2 53C1 B33C6XY A126V AC 34-41-00 XC5 NC B34YB1ZESS FLT B195 AFC 2 ACCESS A5Y B28C6 X ZC1107 A1 B5XINST BOX (E1-5) ZB1 A6B29 RSYMAGNETIC HEADINGVOR A5 B6YBUS B5 B30ZDB104BRMI 2 A6 C39Z2 DB104B A39B6XALT 34-41-00 B39XH 39 B1742 HDGY Y INS
TX3 40
H'C B34 C43 Z Z X SIN41 B35 X R298 F/O VOR/ILS/INS A28A17X1 1 Y COSC17 Y RLY (P73)A34 A29 RSXX Y11 C34 ZC Z C'A3514 A30ZYY C35
TX4 10
H DB144CX13 ZZ HSI VALID -C1512 54 A37YAC C16 HDG VALID +X26V AC 55 A36ZH 48 C32 X HDG VALID -FLT INST 51 A15Y B39X DC

TX549
B15 YCBUS 2 C732 180` BIAS SIGNALA1652 B144 CIWSYZ CB16 Z A50HDG SYNC A32 COMPUTER (E1-1)ZAC XB32

B14 DB104C
EXCIT 3 C38 2A38DC DB182E DB182EMAG HDG B38 CAPT 1-F/O 1 CTY55 X X B15C39 3VALID FLAG SAME AS 67
27 B39
A39 YY33-11-00 1 L1655
CDX28 Z
B104 MHR 2 CMPS CPLR 68 B1626V AC Z ZNO. 1(E1-1) 38 28V DC3 76L1656ESS FLT HEADING RADIO MODE GNDBR307 F/O CMPS RLY CAPT 1-F/O 1 CMPSINST C736

CDX

003 BUS HDG SYNC
(P73) RLY POSN LT (P1)

N125 F/O HSI (P3) EXCIT 2
X
73 Y DN133A34-31-00 74NO. 1 ZHDR306P7 PANEL-OVERHEAD MAG HDG 18802DB103B CG CRS-2B38 7CIRCUIT BREAKER DB103B X 3DR3061H ACG 34-31-00A384 Y 34-21-C38 33-11-00 1

TX2 2
C5 00 B182 A/P-F/D MODE SELZ 3 HDGL1655 CAPT 1-F/O 2 PNL (P10)
A40
AC

1 1

X C
CMPS RLY POSN LT (P1)XX B40

1
34-31-00 Y Y

30
33 Y HDGNC C40
TX1 29
2RSH Z FLAG32 Z Z B39 331 A39AC C39 + HDGX 3648SHEET 3 H C17 -VALID 51 Y 37A17 SHEET 3 DCC TX5 49 C34 52 A34Z C3550 N133 F/O RDDMI (P3)A35AC

B17
MAG HDG B34

DN163DB103C -
DCVALID FLAG B35 3755 NO. 2 + HDG VALID HDG34-21-01 36 H FLAGR306 CAPT CMPS RLY 10B103 MHR 1 CMPS CPLR C(P73) 24(E1-1)
X 34-31-0023
Y TX926V AC Z2 DR307 8 HDGPOWERED FROM 26V AC STBY BUS DB180B DB179DB181 ESS FLT B25 X60 41 14 B60 C42 B60 C42 NO. 1 1INST BUS C1119 ADF YRMI 1 ALTN DR3071 C & H, X & Y INTENTIONALLY REVERSED 2 RS 26V AC ZTO PROVIDE CORRECT INDICATION A25 3

FLT INST C25 H
BUS 2 C1121 ADF 182 ON LH ALL EXCEPT 001-003; NO. 2 3 CRMI 1 7POWERED FROM 26V AC STBY BUS AC

B180 A/P-F/D B B179 A/P-F/D A B181 A/P-F/D C R307 F/O CMPS
P7 PANEL-OVERHEAD

ROLL CMPTR (E1-5) ROLL CMPTR (E1-4) ROLL CMPTR (E1-6) RLY (P73) N163 CAPT ADF RMI (P1)
CIRCUIT BREAKER
Magnetic Heading Reference System Schematic
Figure 4 (Sheet 5)

EFFECTIVITY

AF 152-156,172,173,191-199; LH 011-099; AZ ALL; GN ALL; 799 Page 23/24 MD ALL; VM ALL Apr 25/93
34-21-00

26V AC
NO. 2 DR307  RADIO 180` BIAS
26V AC DR298  C AFLT INST SIGNAL

DC DB231B
A45 DR298 DN125NORM 13C729 FLT INST C37BUS 2 A44 8CAPT F/O A37 B40F/O FLT POWERBUS C74112 14 34-41-00 B372 1 B43 7INST SW NO. 2 HSI 2 B41 SUPPLYACDR30711RELAYS (P7) 2 VOR ILSA42

B231 INSTR SW
BCOMP A3 C25 INS ANN26V AC

ACCESS BOX  DCCKTA41 A25 A31S606 CAPT COMP SW (P1)FLT INST

(P73)  NC B25INTER MAG/TRUE ANNB48C735 DB195CBUS 2 RUPT H'VOR RMI 1

18  XB31C25 HDGC1C'26V AC YA25 B32C5HB25ESS FLT Z NOTB33X 22-10-11 C6CC1 XINST C1106 X A1 USED B34A1Y X XC5 YB1BUS ALT RMI 1 YMAGNETIC HEADING B28A5 A5Z YYC6 ZZ 34-41-00 B5 B29 RS

DB104B  X A6 A6Z ZB1DB104B B6X B3026V AC YH 39 B5 C4042ESS FLT Y Z
　
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