S 844-053
 (3)  
Put the airplane in its initial condition.

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

 N.
Test for the M1110 Circuit Card (Nose Sensing Switch)

_______________________________
 S 844-054
 (1)  
Prepare for the test:

 (a)  
Supply electrical power (AMM 24-22-00/201).

 (b)  
Make sure this circuit breaker is closed on the P6 panel: 1) LDG GEAR NOSE STEERING AND AIR/GND

 S 724-055
 (2)  
Do a test of the M1110 circuit card:

 (a)  
Push and hold the NOSE SENSING test switch on front of the E-11 shelf. 1) Make sure the LED above the NOSE SENSING switch comes on.

 (b)  
Release the NOSE SENSING switch. 1) Make sure the LED above the NOSE SENSING switch goes off.

 S 844-056
 (3)  
Put the airplane in its initial condition.

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

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 O.  Test for the M1112 Circuit Card (Gear Transfer Valve Control)_______________________________
 S 844-057
 (1)  
Prepare for the test:

 (a)  
Make sure the ground locks are installed on all the gear (AMM 32-00-01/201).

 (b)  
Supply electrical power (AMM 24-22-00/201).

 (c)  
Supply hydraulic power to systems A and B (AMM 29-15-00/201).

 (d)  
Make sure this circuit breaker is closed on the P6 panel: 1) LDG GEAR SYS XFR VALVE - PRIMARY CONTROL

 (e)  
Open this circuit breaker on the P6 panel:
 1) LDG SYS XFR VALVE - SECONDARY CONTROL

 S 724-058
 (2)  
Do a test of the M1112 circuit card:

 (a)  
Move the landing gear lever to the OFF position.

 (b)  
Push and hold the GROUND SENSING test switch on front of the landing gear electrical module. 1) Make sure the ACTUATED indicator on the E-11 shelf changes

 to white.

 (c)  
Release the GROUND SENSING test switch on front of the E-11 shelf.

 (d)  
Push the ACTUATED indicator to change it to black.

 (e)  
Put actuator bars on the right main gear uplock sensor S74 and the left main gear uplock sensor S72.

 (f)  
Push and hold the GROUND SENSING test switch on the E-11 shelf.

 1)  Make sure the ACTUATED indicator on the E-11 shelf stays black.

 (g)  
Release the GROUND SENSING test switch.

 (h)  
Remove the actuator bar from the right main gear uplock sensor S74.

 (i)  
Push and hold the GROUND SENSING test switch. 1) Make sure the ACTUATED indicator changes to white.

 (j)  
Release the GROUND SENSING test switch.

 (k)  
Remove the actuator bar from the left main gear uplock sensor S72.

 (l)  
Push the ACTUATED indicator to change it to black.

 (m)  
Close the LDG GEAR SYS XFR VALVE - SECONDARY CONTROL circuit breaker on the P6 panel.

 (n)  
Open the LDG GEAR SYS XFR VALVE - PRIMARY CONTROL circuit breaker on the P6 panel.

 (o)  
Push and hold the GROUND SENSING test switch. 1) Make sure the ACTUATED indicator changes to white.

 (p)  
Release the GROUND SENSING test switch.

 (q)  
Push the ACTUATED indicator to change it to black.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-09-20
 ALL  ú ú 01 Page 417 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (r)  
Close the LDG GEAR SYS XFR VALVE - PRIMARY CONTROL circuit breaker on the P6 panel.

 (s)  
Push the TEST 1 button on the E-11 shelf. 1) Make sure the ACTUATED indicator changes to white.
　
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