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 gear.
 2)  Make sure the door open indication does not show for more than 25 seconds.
 3)  Make sure the movement of the gear doors is smooth and moves at a linear rate.
 4)  Make sure the time for the main gear door to close is not more than 6 seconds.
 NOTE:____ Do not use the EICAS indication to measure the door
 close time. From the ground, measure the time for the doors to close. Start to measure the time when
 the doors start to close.
 (e) (f) (g) (h)  Move the control lever to the UP position. 1) Make sure there is no interference between the components attached to the landing gear and the landing gear when the gear retracts. 2) Make sure the landing gear is up and locked.Move the control lever to the OFF position.Move the control lever to the DN position.When the landing gear is in the half extended position, immediately move the control lever to the UP position.
 NOTE:____ You must smoothly move the control lever from the DN position to the UP position in approximately 3 seconds.
 (i) (j)  1) Make sure the direction of the landing gear changes. 2) Make sure the landing gear goes to the retracted position. 3) Make sure the components attached to the landing gear do not hit other landing gear components as it retracts. 4) Make sure the landing gear doors close. 5) Make sure there is no fluid leakage from the hydraulic system for the landing gear. 6) Make sure there is no mechanical damage. 7) Make sure the landing gear does not touch, hit, or catch on the landing gear doors.Move the control lever to the DN position when the gear UP indication shows on the upper EICAS display. 1) Make sure the landing gear is down and locked.Move the control lever to the UP position.

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747-400 MAINTENANCE MANUAL
 (k) When the landing gear is in the half retracted position, N immediately move the control lever to the DN position.
 NOTE: You must smoothly move the control lever from the UP
____ position to the DN position in approximately 3 seconds.
 1) Make sure the direction of the landing gear changes. 2) Make sure that the landing gear goes to the down and locked
 position. 3) Make sure the landing gear doors close. 4) Make sure there is no fluid leakage from the hydraulic
 system for the landing gear. 5) Make sure that there is no mechanical damage. 6) Make sure there is no interference between the components
 attached to the landing gear and the landing gear when the gear extends. 7) Make sure the landing gear does not hit, or catch on the landing gear doors.
 (l)  Move the control lever to the OFF position after the gear DOWN indication shows on the upper EICAS display.
 S 865-134
 (19) Remove the pressure from hydraulic systems No. 1 and 4 (AMM 29-11-00/201).
 S 485-135
 WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING
_______ GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (20)
 Install the ground locks in all landing gear (AMM 09-11-00/201).

 S 735-101

 (21)
 Do these steps to check the mechanical lock hook on each truck of the main landing gear (Fig. 501):

 (a)  
Move the ground release handles for the main landing gear to the DOORS OPEN position.

 (b)  
Remove the ground lock from the serviced gear.

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

 (d)  
Increase the pressure slowly in hydraulic system No. 4 until the mechanical lock hook engages the roller. (AMM 29-11-00/201). 1) Make sure the mechanical lock hook engages the roller.

 (e)  
Measure the angular travel of the oleo from the gear down N position to the position where the truck fully locks up.

 NOTE: You must put the inclinometer on a straight area of the
____ oleo cylinder to accurately measure the oleo travel.
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