(3)
Supply electrical power with an external source (Ref 24-22-00/201).
S 495-005
(4)
If you use an external source for hydraulic power, connect the source to system A (Ref 29-15-00/201).
(a)
Do not pressurize the system at this time.
S 865-004
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737-300/400/500MAINTENANCE MANUAL
S 865-006
(5)
Make sure all the circuit breakers for the landing gear are closed on the circuit breaker panel, P6.
S 865-007
(6)
Make sure the circuit breakers for press-to-test and the indicator lights are closed on the circuit breaker panel, P6.
S 865-008
CAUTION: OPEN THE CIRCUIT BREAKERS THAT FOLLOW BEFORE YOU DO THE TEST.
_______ IF YOU DO NOT OPEN THE CIRCUIT BREAKERS, HYDRAULIC FLUID AND PRESSURE CAN MOVE FROM SYSTEM B TO SYSTEM A.
(7)
Open these circuit breakers on the P6-2 panel:
(a)
PRIMARY LG TRANSFER VALVE CONTROL (C781)
(b)
SECONDARY LG TRANSFER VALVE CONTROL (C799)
E.
Do a Test of the Indicator Lights.
S 865-009
(1) Move the two engine thrust levers to a position more than 30 degrees.
NOTE: The thrust lever position is given in approximate degrees
____
from the idle position.
S 865-010
(2)
Put the control lever for the landing gear in the DN position.
(a)
Look at the indicator lights for the landing gear, above the control lever.
(b)
Make sure the green indicator light for each gear is on.
S 865-011
(3)
Make sure the hydraulic systems A and B are not pressurized (Ref 29-15-00/201).
S 865-012
(4)
Move the control lever for the landing gear to the UP position.
(a)
Make sure the red warning lights come on and the green indicator lights stay on.
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737-300/400/500MAINTENANCE MANUAL
(5) S 865-013Put the LIGHTS test switch, on the P2 panel, in the DIM position. (a) Make sure the green indicator lights and red warning lights get dim.
(6) S 095-014Remove the ground locks from all the landing gear (Ref 32-00-01/201).
S 865-015
WARNING: MAKE SURE THAT ALL PERSONS AND EQUIPMENT ARE CLEAR OF THE
_______ LANDING GEAR AREA. THE LANDING GEAR WILL RETRACT WHEN HYDRAULIC POWER IS SUPPLIED.
(7)
Make sure all persons and equipment are clear of the landing gear area before you supply hydraulic power.
S 865-016
(8)
If you use an external hydraulic source, do this step:
(a)
Supply and control the hydraulic pressure to the hydraulic system A until you get slow gear operation (Ref 29-15-00/201).
S 865-017
(9) If you use the hydraulic system on the airplane to supply the hydraulic power, do these steps:
NOTE: Since you cannot control the pressure in the system, the gear
____ will retract and extend faster. You will have to monitor the indicator lights more carefully.
(a)
Move the control lever for the landing gear to the DN position.
(b)
Supply hydraulic power to system A (Ref 29-15-00/201).
(c)
Move the control lever to the UP position.
S 715-018
(10)
Look at the indicator lights for the landing gear, above the control lever.
(a)
Make sure the applicable green indicator light goes off when the related lock braces for the main and nose gear release.
(b)
Make sure the applicable red warning light goes off when the related landing gear retracts to the up and locked position.
S 865-019
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