S 865-056

 (2)  
Release the pressure from hydraulic system No. 1 (AMM 29-11-00/201).

 S 485-057

 (3)
Actuate the Main Gear Tilt Switches with the proximity sensor set.

 S 715-086

 (4)  
Make sure that the lever lock solenoid is blocking the landing gear control handle from moving to the UP position.

 S 865-096
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, ELEVATORS, FLAPS,SPOILERS,LANDING GEAR, AND THRUST REVERSERS CAND MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (5)  
Slowly pressurize hydraulic system No. 1 (AMM 29-11-00/201).

 (6)  
Move the Captain's Tiller to the neutral position.

 (7)
Remove pressure from hydraulic system No. 1 (AMM 29-11-00/201).

 S 715-085

 (8)  
Make sure the lever lock solenoid is not blocking the landing gear control handle from moving to the UP position.

 (9)  
Remove the proximity sensors from the main gear tilt sensors.

 S 865-083
 S 865-084
 S 085-059
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 865-100
 (10)
 Remove the DO-NOT CLOSE tags and close these circuit breakers:

 (a)  
P180 DC Power Distribution Panel
 1) 180E7 ELEV/RUD VLV SYS 2
 2) 180H8 ELEV/RUD VLV SYS 1
 3) 180E22 ELEV/RUD VLV SYS 4
 4) 180E23 ELEV/RUD VLV SYS 3

 K.
Test continuity of Body Gear Steering Actuator axial feedback transducer.

 S 865-105
 (1)  
Open these circuit breakers and attach the DO-NOT CLOSE tag:

 (a)  
P7-2 Overhead Circuit Breaker Panel
 1) 7F25 PSEU SECT 1
 2) 7F26 PSEU SECT 2
 3) 7G23 BODY GR STRG ARM AC
 4) 7G24 BODY GR STRG ARM DC

 S 015-106
 (2)
Remove the electrical connector of the actuator to be checked:

 (a)  
Electrical connector DX401 for the left actuator of the left body gear.

 (b)  
Electrial connector DX402 for the right actuator of the left body gear.

 (c)  
Electrical connector DX402 for the right actuator of the left body gear.

 (d)  
Electrical connector DX404 for the left actuator of the right body gear.

 (e)  
Electrical connector DX403 for the right actuator of the right body gear.

 S 285-107
 (3)  Using an ohmmeter, check the impedance between the following pins on the actuator:
 NOTE: there should be continuity between the pins (sample impedance
____ values are: 90 ohms between pins 3 and 2; 260 ohms between pins 3 and 4).
 (a)  pin 3 & 2.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 (b)  pin 3 & 4.
 S 415-108
 (4)
Connect the electrical connector of the actuator that was checked:

 (a)  
Electrical connector DX401 for the left actuator of the left body gear.

 (b)  
Electrical connector DX402 for the right actuator of the left body gear.

 (c)  
Electrical connector DX404 for the left actuator of the right body gear.

 (d)  
Electrical connector DX404 for the left actuator of the right body gear.

 (e)  
Electrical connector DX403 for the right actuator of the right body gear.

 S 865-109
 (5)
Remove the DO-NOT CLOSE tags and close these circuit breakers:

 (a)  
P7-2 Overhead Circuit Breaker Panel
 1) 7F25 PSEU SECT 1
 2) 7F26 PSEU SECT 2
 3) 7G23 BODY GR STRG ARM AC
　
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