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 ALL  01 Page 505  Apr 25/9134-41-06
 FLIGHT INSTRUMENT SWITCHING RELAY - REMOVAL/INSTALLATION
________________________________________________________
 1.  General (Fig. 401)
_______
 A.  The flight instrument switching relays are mounted with screws on flight
 instrument switching relay panel P73, in the main equipment center. XA On A/C incorporating AEB AF 34-162, indexing pins preclude installation XA of inappropriate relays.
 B.  Open the flight instrument switching relays circuit breakers on electronic circuit breaker panel P7 before disconnecting a relay and removing it from the relay panel.
 C.  After installing a flight instrument switching relay, test as follows:
 (1)  
Provide electrical power (Ref 24-22-00).

 (2)  
Close all appropriate flight instrument and HSI circuit breakers.

 NOTE: To test the captain's flight instrument switching relays, use
____ the captain's HSI and transfer switches. To test the first officer's flight instrument switching relays, use the first officer's HSI and transfer switches.
 (3)  
Test RADIO/INS (VOR-ILS/INS) relay.

 (a)  
Alternately set the appropriate VOR-ILS/INS switch to each of its positions.

 (b)  
Check that the VOR-ILS/INS annunciator readout on the appropriate HSI agrees with the VOR-ILS/INS switch position.

 

 (4)  
Test INS transfer relay.

 (a)  
Set VOR-ILS/INS switch to INS position.

 (b)  
Alternately set the appropriate INS transfer switch to each of its positions.

 (c)  
Check that the data source annunciator numerical readout, on the appropriate HSI, agrees with the INS transfer switch position.

 

 (5)  
Restore airplane to normal.

 EFFECTIVITY

 
 ALL  21 Page 401  Apr 25/8634-41-07
P73 FLIGHT INSTRUMENT
SWITCHING RELAY PANEL R449 R450
R297
R298 R302 R303
B231 R305 R306 R307 R304
R288 R289
R288 FLIGHT DIRECTOR COMPUTER SELECT RELAY NO. 1 (CAPT) R289 FLIGHT DIRECTOR COMPUTER SELECT RELAY NO. 2 (F/O) R297 RADIO/INS RELAY NO. 1 (CAPT) R298 RADIO/INS RELAY NO. 2 (F/O)R302 INS TRANSFER RELAY NO. 1 (CAPT) R303 INS TRANSFER RELAY NO. 2 (F/O)
E1-1
E1-2
E1-3
E1-4
E1-5
E1-6
NOTE: WIRING AND CONNECTOR DETAIL OMITTED FOR CLARITY.
R304 ATTITUDE/COMPASS STABILIZATION TRANSFER RELAY NO. 1 (CAPT)R305 ATTITUDE/COMPASS STABILIZATION TRANSFER RELAY NO. 2 (F/O) R306 COMPASS TRANSFER RELAY NO. 1 (CAPT) R307 COMPASS TRANSFER RELAY NO. 2 (F/O)R449 VOR/ILS TRANSFER-A RELAY NO. 1 (CAPT) R450 VOR/ILS TRANSFER-A RELAY NO. 2 (F/O) B231 INSTRUMENT SWITCHING ACCESSORY BOX
Flight Instrument Switching Relay Panel Figure 401 (Sheet 1)
EFFECTIVITY

LH 001-010,071-080 AF 101-150; AZ 201-211; 799 Page 402 SN 301,302; IB 405 Apr 25/86
34-41-07
R304
B556 1 R288
R306 R857 2
R302
R297
R449
R855 B231
R856
R450
R858 2 R298
R303
R307
B557 1R289
R305
NOTE: WIRING AND CONNECTOR DETAILP73 FLIGHT INSTRUMENT SWITCHING RELAY PANEL
____ 
OMITTED FOR CLARITY. 
1
 LH 001-030,051-070,082-099; IB 406-499 
AZ 221-299 
2  LH 081; AF 151-199

R288 FLIGHT DIRECTOR COMPUTER SELECT RELAY NO. 1 (CAPT) R289 FLIGHT DIRECTOR COMPUTER SELECT RELAY NO. 2 (F/O) R297 RADIO/INS RELAY NO. 1 (CAPT) R298 RADIO/INS RELAY NO. 2 (F/O) R302 INS TRANSFER RELAY NO. 1 (CAPT) R303 INS TRANSFER RELAY NO. 2 (F/O) R304 ATTITUDE TRANSFER RELAY NO. 1 (CAPT) R305 ATTITUDE TRANSFER RELAY NO. 2 (F/O) R306 COMPASS TRANSFER RELAY NO. 1 (CAPT) R307 COMPASS TRANSFER RELAY NO. 2 (F/O) R449 VOR/ILS TRANSFER A RELAY NO. 1 (CAPT) R450 VOR/ILS TRANSFER A RELAY NO. 2 (F/O) R855 VOR/ILS TRANSFER B RELAY NO. 1 (CAPT) R856 VOR/ILS TRANSFER B RELAY NO. 2 (F/O) R857 COMPASS STABILIZATION TRANSFER RELAY NO. 1 (CAPT) R858 COMPASS STABILIZATION TRANSFER RELAY NO. 2 (F/O) B231 INSTRUMENT SWITCHING ACCESSORY BOX B556 VOR/ILS ISOLATION AMPLIFIERS (CAPT) B557 VOR/ILS ISOLATION AMPLIFIERS (F/O)
Flight Instrument Switching Relay Panel
Figure 401 (Sheet 2)

EFFECTIVITY
LH 011-030,051-070,081-099;

AF 151-199; IB 406-499; MD 501-599; GN 601-699; VM 751-799; 799 Page 403 AZ 221-299 Aug 25/81
34-41-07
R304
R288 B556 R306 B112 R302 R297 R449 R855
R299 R856
B231
R300
R450

B113 R298 R303 R307 B557 R289
R305
NOTE: WIRING AND CONNECTOR DETAIL OMITTED FOR CLARITY.
P73 FLIGHT INSTRUMENT SWITCHING RELAY PANEL
R288 FLIGHT DIRECTOR COMPUTER SELECT RELAY NO. 1 (CAPT) R289 FLIGHT DIRECTOR COMPUTER SELECT RELAY NO. 2 (F/O) R297 RADIO/INS RELAY NO. 1 (CAPT) R298 RADIO/INS RELAY NO. 2 (F/O) R299 DEVIATION TRANSFER RELAY (CAPT) R300 DEVIATION TRANSFER RELAY (F/O) R302 INS TRANSFER RELAY NO. 1 (CAPT) R303 INS TRANSFER RELAY NO. 2 (F/O) R304 ATTITUDE TRANSFER RELAY NO. 1 (CAPT) R305 ATTITUDE TRANSFER RELAY NO. 2 (F/O) R306 COMPASS TRANSFER RELAY NO. 1 (CAPT) R307 COMPASS TRANSFER RELAY NO. 2 (F/O) R449 VOR/ILS TRANSFER A RELAY NO. 1 (CAPT) R450 VOR/ILS TRANSFER A RELAY NO. 2 (F/O) R855 VOR/ILS TRANSFER B RELAY NO. 1 (CAPT) R856 VOR/ILS TRANSFER B RELAY NO. 2 (F/O) B112 CAPT'S VOR/ILS ISOLATION AMPLIFIER-2 B113 F/O'S VOR/ILS ISOLATION AMPLIFIER-2 B231 INSTRUMENT SWITCHING ACCESSORY BOX B556 CAPT'S VOR/ILS ISOLATION AMPLIFIER-1 B557 F/O'S VOR/ILS ISOLATION AMPLIFIER-1
　
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