BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 (d)

(e)

(f)

(g)

(h)

(i)

A
737-300/400/500MAINTENANCE MANUAL
 2) Make sure that the IRS master caution light on the
 captain's side of the pilot's lightshield turns off. 3) Make sure that the crew horn stops.Open the IRS NO. 2 AC circuit breaker on the P6-1 panel. 1) Make sure that the ON DC light on the right side of the MSU
 turns on. 2) Make sure that the master caution light on the first officer's side of the pilot's lightshield turns on. 3) After approximately 20 seconds, make sure that the crew
 horn operates.Close the IRS NO. 2 AC circuit breaker on the P6-1 panel. 1) Make sure that the ON DC light on the right side of the MSU
 turns off. 2) Make sure that the master caution light on the first
 officer's side of the pilot's lightshield turns off. 3) Make sure that the crew horn stops.Open the EQUIPMENT COOLING BLOWER NORMAL circuit breaker on the P18-3 panel. 1) Make sure the EQUIPMENT COOLING OFF light on the P5 panel
 turns on.

 NOTE: Permit 1 or 2 minutes for the light to turn on
____
 because of the external temperature.

 2) After approximately 20 seconds, make sure that the crew
 horn operates.Close the EQUIPMENT COOLING BLOWER NORMAL circuit breaker on the P18-3 panel. 1) Make sure that the crew horn turns off.Set the EQUIPMENT COOLING switch on the P5 panel to the ALTERNATE position.Open the EQUIPMENT COOLING BLOWER ALTERNATE circuit breaker on the P18-3 panel. 1) Make sure that the EQUIPMENT COOLING OFF light on the P5
 panel turns on.

 NOTE: Permit 1 or 2 minutes for the light to turn on
____
 because of the external temperature.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT EFIS ú

 34-28-00

 ú ú 04A Page 516 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 2)  After approximately 20 seconds, make sure that the crew horn operates.
 (j)  
Close the EQUIPMENT COOLING BLOWER ALTERNATE circuit breaker on the P18-3 panel. 1) Make sure that the crew horn turns off.

 (k)  
Set the EQUIPMENT COOLING switch on the P5 panel to the NORMAL position.

 G.  Put the Airplane Back to Its Usual Condition
 S 865-091
 CAUTION:_______SOME SWITCHES MUST BE PULLED AND THEN TURNED. IF YOU TRY TO TURN THESE SWITCHES BEFORE YOU PULL THEM, YOU CAN DAMAGE THEM.
 CAUTION:_______TURN THE SWITCHES ON THE MSU TO THE OFF POSITION. FAILURE TO TURN THE SWITCHES TO THE OFF POSITION CAUSES A HORN IN THE NOSE WHEEL WELL TO START.
 (1)  
Turn the switches on the MSU to the OFF position.

 S 865-076

 (2)
Remove the IRU cooling if it is not necessary (AMM 21-58-00/501).

 S 865-077

 (3)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 TASK 34-28-00-715-078
 4.  IRS Self-Test_____________
 NOTE: This is a scheduled maintenance task.
____
 A.  References
 (1)  
AMM 21-58-00/501, Equipment Cooling

 (2)  
AMM 24-22-00/201, Manual Control

 B.  Access
 (1)  Location Zones
 101/102 Flight Compartment

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT EFIS ú

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 ú ú 03A Page 517 ú Nov 12/01

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 C.  Prepare for the Test
 S 865-079
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-087

 (2)  
Supply cool air to the inertial reference units (IRU)
 (AMM 21-58-00/501).

 S 865-080

 (3)  
Make sure these circuit breakers are closed:

 (a)  
P6 Load Control Center
 1) IRS NO. 2 AC
 2) IRS NO. 2 DC

 (b)  
P18 Load Control Panel
 1) IRS NO. 1 AC
　
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