(f)
Set the alternate flap arm switch to the OFF position.
1) Make sure that the leading edge flaps and slats fully retract.
(g)
Do steps (d) and (e) again to operate the leading edge flaps and slats a minimum of two full cycles to bleed air from the system.
(h)
Complete the operation with the alternate flap arm switch in the OFF position to put the leading edge devices in the retracted position.
(i)
Set the Position System B Flight Control switch to the ON position.
(j)
Set the Position System A Flight Control switch to the ON position.
(k)
Move the flap control lever to the 1-unit detent to extend the leading edge flaps.
(l)
Examine the hydraulic fittings on the actuator for leakage.
(m)
Do this task to release the pressure from hydraulic system B: "Leading Edge Flaps and Slats Hydraulic Systems A, B and Standby Depressurization" (Ref 27-81-00/201).
(n)
Put the alternate flap arm switch in the ARM position.
(o)
Make sure that the standby hydraulic system low pressure light is off.
(p)
Monitor the leading edge flaps and slats for 60 seconds.
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27-81-31
ALL ú ú 02 Page 406 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
(q) Make sure that the flaps and slats do not move.
NOTE: The leading edge flaps can slowly extend because of
____
gravity.
After 1 minute with no hydraulic pressure, the distance between the lower surfaces of the flap trailing edge and the adjacent wing must not be more than 2 (for a new or over-hauled actuator) or 4 (for an in-service actuator) inches.
(r)
Set the alternate flap arm switch in the OFF position.
E.
Put the Airplane Back to Its Usual Condition
S 864-027
(1)
Move the flap control lever to the FLAP UP detent to retract the leading edge flaps.
S 864-029
(2)
Do this task if electrical power is not necessary: "Electrical Power Removal" (Ref 24-22-00/201).
S 614-030
(3)
Do this task if servicing is necessary for the hydraulic reservoir: "Hydraulic Reservoir Servicing" (Ref 12-12-00/301).
S 864-031
(4)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
PTU circuit breakers C1081 and C1085.
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27-81-31
ALL ú ú 01 Page 407 ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
LEADIND EDGE FLAP ACTUATOR - INSPECTION/CHECK
_____________________________________________
1. General_______
A. This procedure contains the task to do a check of the actuator of the leading edge flap.
TASK 27-81-31-206-001
2. Leading Edge Flap Actuator Inspection/Check___________________________________________
A. References
(1)
27-81-31/401, Leading Edge Flap Actuator
B.
Access
(1)
Location Zone
216 Main Wheel Well, LH
C.
Do a Check of the Leading Edge Flap Actuator
S 026-002
(1)
Do this task: "Leading Edge Flap Actuator Removal" (Ref 27-81-31/401).
S 226-003
(2)
Do a check of the actuator (Fig. 601):
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