E.  
The printed-circuit cards that are installed in the landing gear logic shelf are shown in the table below: ~................................................................ | CARD NUMBERS AND FUNCTIONS OF THE | | PRINTED CIRCUIT CARDS IN THE LANDING GEAR MODULE | .................................................................. | CARD NUMBER | FUNCTION OF THE CARD | .................................................................. | M981 | RIGHT GEAR DOWN AND LOCK SWITCH | .................................................................. | M982 | RIGHT GEAR UP AND LOCK SWITCH | .................................................................. | M983 | NOSE GEAR RED LIGHT AND TAKE OFF WARNING | .................................................................. | M986 | MAIN GEAR RED LIGHT | .................................................................. | M987 | LEFT GEAR DOWN AND LOCK SWITCH | .................................................................. | M988 | LEFT GEAR UP AND LOCK SWITCH | .................................................................. | M989 | AURAL WARNING LOGIC | .................................................................. | M990 | GROUND SENSING SQUAT SWITCH | .................................................................. | M991 | AIR SENSING SQUAT SWITCH | .................................................................. | M1110 | NOSE AIR SENSING PROX SWITCH | .................................................................. | M1112 | GEAR TRANSFER VALVE CONTROL | .................................................................. | M1190 | ENGINE SPEED DETECTOR |

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A
737-300/400/500MAINTENANCE MANUAL
 ~................................................................ | CARD NUMBERS AND FUNCTIONS OF THE | | PRINTED CIRCUIT CARDS IN THE LANDING GEAR MODULE | .................................................................. | CARD NUMBER | FUNCTION OF THE CARD | .................................................................. | M1214 | NOSE GEAR DOWN SWITCH | .................................................................. | M1215 | NOSE GEAR LOCK PROX SWITCH | .................................................................. | M1452 *[1] | POWER SUPPLY | .................................................................. | M1453 *[1] | ARINC 429 RECEIVER | 2..............….................................................1
 *[1] Not installed on all airplanes.
 TASK 32-09-20-004-001
 2.  Landing Gear Logic Shelf - Printed Circuit Cards - Removal__________________________________________________________
 A. References
 (1)  
AMM 20-40-12/201, Electrostatic Discharge Sensitive Devices

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

 B.
Access

 (1)  
Location Zones
 205 Electronic Compartment

 C.
Remove the Circuit Card

 S 864-002
 (1)  Make sure that electrical power is removed from the airplane (AMM 24-22-00/201).
 S 864-003
 CAUTION: DO NOT TOUCH THE LANDING GEAR MODULE BEFORE YOU DO THE
_______ PROCEDURE FOR DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE CIRCUIT CARDS THAT ARE IN THE MODULE.
 (2)  
Do the procedure for devices that are sensitive to electrostatic discharge (AMM 20-40-12/201).

 S 014-004

 (3)  
Remove the cover from the module.

 (a)  
Make sure you do not let dirt, dust, or moisture into the module when you remove the cover.

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A 737-300/400/500MAINTENANCE MANUAL

Printed Circuit Cards - Landing Gear Logic Shelf - Installation
Figure 401 (Sheet 1)

A06884
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