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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 2)  Make sure that all of the lights on the MSU turn on.
 (e)  
Release the DIM and TEST switch on the pilot's center instrument panel.

 (f)  
Turn the inner DSPL SEL switch (BR) on the ISDU counterclockwise.

 (g)  
Set the DIM and TEST switch on the pilot's center instrument panel to the DIM position.

 (h)  
Push the lights on the MSU one at a time. 1) Make sure that the lights come on one at a time.

 (i)  
Set the DIM and TEST switch on the pilot's center instrument panel to the BRT position. 1) Make sure that only the ALIGN lights on the MSU are on.

 (j)  
Set the switches on the MSU to the OFF position.

 1)  Make sure that, after 20 to 40 seconds, the ALIGN lights on the MSU turn off.
 E.  Five Minute Time Delay Check
 S 735-072
 (1)  Do these steps to do the five minute time delay check.
 CAUTION:_______SOME SWITCHES MUST BE PULLED AND THEN TURNED. IF YOU TRY TO TURN THESE SWITCHES BEFORE YOU PULL THEM, YOU CAN DAMAGE THEM.
 (a)  
Set the switches on the MSU to the ALIGN position.

 (b)  
Open these circuit breakers: 1) P6-1 Electronic System F/O Circuit Breaker Panel a) IRS NO. 2 AC 2) P18-2 Electronic System Captain Circuit Breaker Panel a) IRS NO. 1 AC

 3)  In less than 30 seconds, make sure that the crew horn operates.

 (c)  
Open the LANDING GEAR AIR/GND RELAY AND LIGHTS circuit breaker on the P6 panel. 1) Make sure that the BAT switch on the P5 panel is ON.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT EFIS ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 2) Make sure that the two ALIGN lights on the MSU are on. 3) Make sure that the two ON DC lights on the MSU are on. 4) After approximately 5 seconds, make sure that the two IRS
 master caution lights on the pilot's lightshield turn on. 5) After 5 minutes, make sure that: a) The ALIGN and ON DC lights on the right side of the MSU are off, b) The ALIGN and ON DC lights on the left side of the MSU are on.
 (d)  Close these circuit breakers: 1) P6 Load Control Center, Right Panel a) LANDING GEAR AIR/GND RELAY AND LIGHTS 2) P6-1 Electronic System F/O Panel a) IRS NO. 2 AC
 3)  P18-2 Electronic System Captain Panel a) IRS NO. 1 AC
 F.  Ground Horn Check through IRS
 S 865-073
 (1)  Make sure that these circuit breakers are closed:
 (a)  P18-3 PASS CAB EXT LTG/W/HH + AA/I PANEL
 1) EQUIPMENT COOLING BLOWER NORMAL
 2) EQUIPMENT COOLING BLOWER ALTERNATE
 3) EQUIPMENT COOLING CONTROL

 S 735-074
 (2)  Do these steps to do the ground horn check through the IRS.
 CAUTION:_______SOME SWITCHES MUST BE PULLED AND THEN TURNED. IF YOU TRY TO TURN THESE SWITCHES BEFORE YOU PULL THEM, YOU CAN DAMAGE THEM.
 (a)  
Set the switches on the MSU to the ATT position.

 (b)  
Open the IRS NO. 1 AC circuit breaker on the P18-2 panel. 1) Make sure that the ON DC light on the left side of the MSU comes on. 2) Make sure that the IRS master caution light on the captain's side of the pilot's lightshield comes on.

 3)  After approximately 20 seconds, make sure that the crew horn operates.

 (c)
Close the IRS NO. 1 AC circuit breaker on the P18-2 panel.

 1)  Make sure that the ON DC light on the left side of the MSU turns off.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT EFIS ú

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