(f)  
Push the throttle horn reset switch on the aisle stand. 1) Make sure you do not hear the aural warning horn.

 (g)  
Move the No. 1 throttle to the fully forward position.

 (h)  
Move the No. 2 throttle to the fully idle position. 1) Make sure you hear the warning horn continuously.

 (i)  
Push the throttle horn reset switch on the aisle stand. 1) Make sure you do not hear the aural warning horn.

 (j)  
Move the No. 2 throttle to the fully forward position.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (k)  
Move the two throttles to the idle position. 1) Make sure you hear the aural warning continuously.

 (l)  
Fully retract the flaps. 1) Make sure you do not hear the aural warning horn.

 (m)  
Extend flaps to the 15 unit position. 1) Make sure you hear the aural warning continuously.

 (n)  
Push the horn reset switch. 1) Make sure you hear the aural warning continuously.

 (o)  
Remove the deactuator bar from the nose gear down sensor S845. 1) Make sure you do not hear the aural warning horn.

 (p)  
Put the deactuator bar on the right main gear downlock sensor S73. 1) Make sure you can hear the aural warning continuously.

 (q)  
Remove the deactuator bar from sensor S73. 1) Make sure you do not hear the warning horn.

 (r)  
Put the deactuator bar on the left main gear downlock sensor S71.

 (s)  
Make sure you can hear the aural warning continuously.

 (t)  
Remove the deactuator bar from sensor S71. 1) Make sure you do not hear the warning horn.

 S 844-047
 (3)  
Put the airplane in its initial condition.

 (a)  
Set the parking brake.

 (b)  
Move the two throttles to the idle position.

 (c)  
Move the flap lever to the UP position.

 (d)  
Remove pressure from hydraulic system A and B, if it is not necessary (AMM 29-15-00/201).

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

 L.  Test for the M990 Circuit Card (Ground Sensing Squat Switch)______________________________
 S 844-048
 (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) LANDING GEAR AIR/GND RELAY & LTG

 S 724-049
 (2)  
Do a test of the M990 circuit card:

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

 (b)  
Release the GROUND SENSING test button on front of the E-11 shelf. 1) Make sure the LED above the GROUND SENSING switch goes off.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 844-050
 (3)  
Put the airplane in its initial condition.

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

 M.
Test for the M991 Circuit Card ( Air Sensing Squat Switch)

______________________________
 S 844-051
 (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) LANDING GEAR AIR/GND RELAY & LTG

 S 724-052
 (2)  
Do a test of the M991 circuit card:

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

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