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 A.  The system is energized by closing the circuit breakers which supply power to the navigation units, central air data computers (CADC), horizontal situation indicators (HSI), attitude director indicators (ADI), 26-volt ac autotransformers, and flight instrument switching relays. The INS battery units contain individual thermal breakers which must also be closed to energize the system.
 B.  System power requirements include 115-volt ac primary power, 26-volt ac synchro power, 28-volt dc relay control power and 5 volts ac for panel lighting.
 C.  For emergency operation, battery unit No. 3 can be switched in parallel with battery unit No. 1 by operating the INS BAT PARALLEL switch on the flight engineer's panel (P4). This increases the emergency operating time of INS 1 to approximately 30 minutes.
 16. Operation
_________
 A.  Functional Description, Operating Mode Control
 (1)  Modes of Operation

 EFFECTIVITY
 AIRPLANES WITH DELCO INS  CONFIG 1  02 A Page 63  Dec 25/9034-41-00
ELECTRONIC CIRCUIT BREAKER PANEL P7

ESSENTIAL FLIGHT INSTRUMENT BUS
PWR-INS 1 PWR-INS 1 PWR-INS 3 PWR-INS 3 CAPT FLT INST SW RELAYS;
-ATT/COMP STAB -INS -ATT
INS ADS EXCIT 1 NAV INS 1 NAV INS 3 PLATF HDG INS 3 ALT HSI 2 HSI 2 - ALT A
STANDBY BUS
ATT INS 1 ATT ADI 1 ATT INS 3 HSI 1 PLATF HDG INS 1 ALT PLATF HDG INS 3 CAPT FLT INST SW RELAYS;
-VOR-ILS/INS
-RAD/INS NAV INS 1 ADI 1
VM 751-799  AZ 221-299 
AF 151-199  LH 011-030 
121,122  051-070 
MD 501-599  082-099 
1  GN 601-699  IB 405  SN  LH 081  AT 701-750 
X X X X X X X X X X X  X X X X X  X X X X X  X X X X X X X X X X X  X X X X X X X X X X  X X X X X X X  X X X X X 
X X X X X X  X X X X X X X  X X X X X X X  X X X X X X  X X X X X X X  X X X X X  X X X X X X X 

1 AF 101-116; LH 001-010, 071-080
INS Circuit Breakers
Figure 20 (Sheet 1)

EFFECTIVITY

CONFIG 1
AIRPLANES WITH DELCO INS
798 Page 64
34-41-00

 Sep 25/94
 T34577
ELECTRONIC CIRCUIT BREAKER PANEL P7

VM 751-799  AZ 221-299 
AF 121,122  LH 011-030
151-199  051-070
MD 501-599  082-099 
1  GN 601-699  IB 405  SN  LH 081  AT 701-750 
X X X X X X X X X X X X X X  X X X X X X X X X X X X X X 2  X X X X X X X X X X X X  X X X X X X X X X X X X X X  X X X X X X X X X X X X X X  X X X X X X X X X X X X X  X X X X X X X X X X X X X 

FLIGHT INSTRUMENT BUS NO. 2
PWR-ALT INS 3
PWR-ALT INS 3
PWR-INS 2
PWR-INS 2
INS ADS EXCIT 2
ATT INS 2
ATT ADI 2
NAV INS 2
PLATF HDG INS 3
ALT PLATF HDG INS 3
ALT ATT INS 3
ATT ALT INS 3
F/O FLT INST SW RELAYS; -VOR-ILS/INS -INS -RAD/INS -ATT/COMP STAB -ATT
HSI 2
PLATF HDG INS 2
INS 3 PWR RELAY
HSI 1 - ALT A
ADI 2
ELECTRONIC CIRCUIT BREAKER PANEL P126

VM 751-799  AZ 221-299 
AF 121,122  LH 011-030
151-199  051-070 
MD 501-599 
1  GN 601-699  IB 405  SN  LH 081  AT 701-750 
X  X  X  X 
X  X  X  X 
X  X  X  X 
X  X  X  X 
X  X  X  X 
X  X  X  X 
X  X  X 
X  X  X  X X 
X  X  X  X 

BUS

PWR-INS 3 PWR-INS 3 ATT INS 3 ALT ADI 1 ALT ADI 2 NAV INS 3 ALT HSI 1 ALT HSI 2 HSI 1 - ALT B HSI 2 - ALT B XFMR; -8 AND -9

 

AF 101-116; LH 001-010, 071-080 ALL EXCEPT AF 101-116 ESSENTIAL FLIGHT INSTRUMENT BUS ON AF 151-199; MD 501-599; GN 601-699; VM 751-799 FAIL-OP BUS ON AT 701-750; LH 011-030, 051-070, 082-099; AZ 221-299
INS Circuit Breakers Figure 20 (Sheet 2)

T34578
EFFECTIVITY
CONFIG 1AIRPLANES WITH DELCO INS
798 Page 65
34-41-00

 Sep 25/94
 (a)  
The INS has four major operating modes in addition to OFF: Standby (STBY), Align, Navigate (NAV), and Attitude (ATT). When the INS is turned on, it will normally proceed through the standby and align modes and enter the navigate mode, where it will remain until it is downmoded at the end of the flight. The only exception would be in the event of a malfunction when the INS would either be shutdown or placed in the attitude mode. In the attitude mode, the INS computer is turned off and the INS provides only attitude signals.
　
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