ZSHEET 4 3HDG VALID +36 HDG VALID -AC DC 37DB180B DB179

DB181C
DN132 X

60 41  14 B60C42 42 26 27 17 Y
C N
34-31-00  34 TR 31
Z SAME AS M133
H

27 1 C & H, X & Y INTENTIONALLY
CAC

26
REVERSED TO PROVIDE

B180 A/P-F/B B B179 A/P-F/O A B181 A/P-F/O C M132 CAPT RMI 1
CORRECT INDICATION  N133 F/O RMI (P3)
ROLL CMPTR (E1-5) ROLL CMPTR (E1-4) ROLL CMPTR (E1-6) (P1)
Magnetic Heading Reference System Schematic
Figure 4 (Sheet 7)

EFFECTIVITY AF 151 799 Page 27/28
34-21-00

 Aug 25/87

28V DC 5 6 NO. 2 DC 26V AC RADIO
SHEET 3 DR307 DR298 DR298 DN125ESS INST DB231AB44 FLT INST4 180` BIASA38DBUS C736 CAPT ALT A37 B40 POWER42AB43 BUS 2 C741 SIGNAL34-41-00 A39CAPT COMP NORMAL SUPPLYB42 41 B41ACHSI 23SW RELAY F/O ALT DR307 (P7)(P7) 1 B40

CKT B231 INSTR SW ACCESS DC
A23 C226V AC

INTER-BOX (P73) NC
B41 A24

VOR/ILS-C730

BFLT INST RUPT

DB195C
B5 INS ANNB11BUS 2 B4 A22 A31S606 CAPT CMPS SW (P1) YRMI 2 B6 B14 MAG/TRUE ANNB48ZX(P7)

43
A14 B17 X H'26V AC Y

B10 B31 ESS FLT
XA17 YC'B12Z B195 AFC 2 B13B32YA26 X

ZH MAGNETIC HEADING
INST C1107 A13 34-41-00 B15X ACCESS BOX (E1-5) B16B33ZA15 Y CBUS ALT RMI 2 A16 B18Y NC B34A18 Z(P7) DB104B
X 26V AC
A25 B20Z B28DB104B B19A27X
MASTER
Y1 34-41-00 B21XH 39 B29 RS28V DCA2FLT INST 42 X ZY

DIM &
A1Y INS
TX3 40
B30C 3A5BUS 2 C732 Y43

TEST
GAC Z A4Z41 A8 R298 F/O RAD/INS RLYZ TEST GNDHDG SYNC

33-11-00
A7X 21 1 A3 G (P73)EXCIT 3 XX Y11 A6 CC(P7) INSR(B) X14 H'ZYY L1656 CAPT 1-A28A9

TX4 10
H DB144CX YH13AC ZZ F/O 1 CMPS RLYA29 A29 RSX12 54A28Y Z C'POSN LT (P1)A32 YX A3055A31Z CH 48 A35 Z51 Y A34X
MASTER
HSI VALID -
TX5 49
A30C A3752 B144 CTL INSTR WRNY HDG VALID +Z
DIM & 1
A3350 A36AC TEST CMPTR (E1-1)Z HDG VALID -3 SAME ASA36 B39DCB2
33-11-00
180` BIAS SIGNALL1656B1DB104C DC CADB182E DB182EMAG HDG B3 255 X XXA11VALID FLAG 27 B1419A10
A12 L1655 CAPT 1-Y Y
CDX 28
B104 MHR 2 CMPS CPLR 20 CTYNO. 1 F/O 2 CMPS RLY Z Z B1526V AC (E1-1)

29 ESS FLT
21R307 F/O CMPS RLY (P73) POSN LT (P1) HEADINGINSR ZB16INST C576

CDX
0 03NO. 1(A) 28V DCDR306MAG HDGBUS HDG SYNC DB103B X RADIO MODE GNDB1 BDR306DB103B 16XEXCIT 2 Y1 B2H 34-31-00 17A2 34-31-00(P7) 4 ZY N125 F/O HSI (P3)

TX2 2
B3C 18A55 COURSE 2AC Z A83 A1 DN133A31 1 B182 A/P-F/D MODE SEL PNL (P10) HA4XX 18A630C CA733 AC 7YY A9
TX1 29
HH

1031
32 A11ZZ CA10 AC 24AC A12X X48 8SHEETH B105134-21-03 Y YCKT 4

TX5 49
C 34-31-00 9 TXB1152 Z ZINTER-50 23NC B12AC RUPT X34-21-04 SHEET 4 B40 1B42DB103C YMAG HDG D B41

2RS VALID FLAG A38
55 ZSHEET 4 3A37 HDG VALID +A39B103 MHR 1 CMPS CPLR 36HDG VALID -NO. 2 DC(E1-1)

37 26V AC
X'R306 CAPT CMPS RLY (P73) 11FLT INST Y'

34-31-00 25 TR BUS 2

Z' NO. 2
C1121 28 HADF RMI 1 27DR307B C(P7) DR307B AC 2626V AC 8 AC7 DB180B DB179
DB181C DN132
ESS FLT 9 N133 F/O RMI (P3)26 2760 41 14 B60C42 42INST BUS
C1119
ALT ADF

DN163 DN163NO. 1 +-DC36 HDG VALID 37RMI 1 (P7) XSAME AS N133 1R307 F/O CMPS

INTERNAL CIRCUITRY RLY (P73)
YSHEET 4 2 SHOWN SAME AS N1321 C & H, X & Y INTENTIONALLY Z3REVERSED TO PROVIDE B180 A/P-F/D B B179 A/P-F/D A B181 A/P-F/D C N132 CAPT RMI HC AC16 26V AC RMI POWER 7

CORRECT INDICATION ROLL CMPTR (E1-5) ROLL CMPTR (E1-4) ROLL CMPTR (E1-6) (P1)
N163 CAPT ADF RMI (P1)

Magnetic Heading Reference System Schematic
Figure 4 (Sheet 8)

EFFECTIVITY

AF 101-116; IB 405;
LH 001-010; SN 301,302 799Page 29/30

34-21-00

Aug 25/87

 XA
 XA  NOTE: On airplane incorporating AEB No. AF 34-326, a 125 mA____
 XA  fuse has been installed to protect the MHRS COUPLER PWR
 XA  SUPPLY against short circuit occuring in the MAGNETIC
 XA  FIELD SENSOR excitation circuit (Fig. 1, sh. 1, and
 XA  Fig. 5, sh. 1).
 XA
 (8) INS Heading Data Monitoring
 (a) The output of the INS CDX is monitored by the INS heading data
 monitor (sheet 2, Fig. 5). When the INS CDX is not excited,
 the superflag output is invalid.
 (9) Servo CT Null and Continuity Monitor
 (a) When the servo CT (sheet 2, Fig. 5) is not at a null or if
 continuity does not exist in the rotor winding, the superflag
 output is invalid. Also, if continuity does not exist, or if
 the servo CT is not at a null, the maintenance flag comes into
 view and remains in view until manually reset with a magnet.
　
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