(c)
Install the hydraulic fittings in the priority valve.
(d)
Remove the plugs from the hydraulic lines.
(e)
Connect the hydraulic lines to the priority valve fittings.
S 864-006
(2)
Do this task: "Hydraulic System B Pressurization"
(AMM 29-15-00/201).
S 874-007
(3)
Extend and retract the flaps to bleed the hydraulic system.
S 794-008
(4)
Examine the hydraulic fittings for leaks.
S 724-009
(5)
Do this task: "Functional Test - Flap Priority Valve" (Ref Paragraph 4).
S 864-010
(6)
Do this task: "Hydraulic System B Depressurization" (AMM 29-15-00/201).
S 614-011
(7)
Do this task: "Service Hydraulic Reservoirs" (AMM 12-12-00/301).
TASK 27-51-84-724-012
4. Functional Test - Flap Priority Valve_____________________________________
A. References
(1)
29-15-00/201, Hydraulic Systems A, B, and Standby
B.
Access
(1)
Location Zone
101, 102 Control Cabin
217 Main Wheel Well
C.
Procedure
S 864-023
(1) Do this task: "Hydraulic System B Pressurization"
(AMM 29-15-00/201).
NOTE: Use the electric hydraulic pump or a hydraulic service cart.
____
S 864-013
(2) To do the test of the flap priority valve with the hydraulic service cart:
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737-300/400/500MAINTENANCE MANUAL
S 724-022
WARNING:_______ KEEP PERSONS AND EQUIPMENT CLEAR OF THE FLIGHT CONTROL
SURFACES, THE THRUST REVERSERS, AND THE LANDING GEAR. THESE
COMPONENTS CAN MOVE SUDDENLY WHEN YOU SUPPLY HYDRAULIC POWER.
THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
(3) Use a hydraulic service cart to supply system B hydraulic power, do this task: Hydraulic System B Pressurization (AMM 29-15-00/201).
NOTE: It will be necessary to control the pressure output of
____ the hydraulic service cart.
S 864-018
(4)
Move the flap control lever from the UP detent to the 10-unit detent.
S 864-019
(5)
Reduce the pressure output from the hydraulic service cart to 2400 psi (16550 kPa).
S 724-020
(6)
Do a check of the time necessary to retract the flaps to the 5-unit position:
NOTE: The flaps will retract slowly with the hydraulic pressure
____ reduced.
(a) Move the flap control lever to the 5-unit position.
NOTE: The flaps can make noise while they retract slowly.
____
(b)
Make sure the time necessary to retract the flaps is a minimum of 60 seconds.
(c)
Increase the pressure output from the hydraulic service cart to 3000 psi (20685 kPa).
NOTE: If the flaps are not in the 5-unit position, they will
____ retract much faster.
S 724-021
(7)
Do a check of the time necessary to retract the flaps to the UP position:
(a)
Move the flap control lever to the UP position.
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737-300/400/500MAINTENANCE MANUAL
(b) Make sure the time necessary to retract the flaps is less than 30 seconds.
S 724-015
(8)
To do the test of the flap priority valve with the electric hydraulic pump:
(a)
Extend and retract the flaps to let the system B hydraulic fluid become warm.
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