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Uncommanded lead-No continuity
Standby drive shutoff valve
Replace leading ing edge device
from P6-2 panel
position lever does not
edge standby drive extension through
through pins B2
move to position 1 (CLOSED)
shutoff valve standby system
and B3 to ground
or position 2 (OPEN)
relay K3. Com-with hydraulic
plete systems system B depres-
test to check for surized
continuity Separation between
Standby shutoff valve
Replace leading ball valve and
position lever moves to
edge drive shutoff valve motor
position 1 (CLOSED) and
valve leading edge flaps and
(Ref 27-81-91, slats do not retract with
R/I) system B pressurized
Wires crossed at
On shutoff valve connector, Repair airplane flight control
check for 28V dc power at
wiring module of shutoff
pin 2 and no power at pin valve connector
3. If otherwise -Leading edge
Perform autoslat trouble
Repair as flaps and slats
Autoslat system
shooting procedure
necessary fail to retract
failure (Ref 27-83-00 TS)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-81-00
 ALL  ú ú 01 Page 103 ú Jul 15/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 LEADING EDGE FLAP AND SLAT CONTROL SYSTEM - MAINTENANCE PRACTICES
_________________________________________________________________
 1.  General_______
 A.  There are five tasks in this procedure. The procedure contains these tasks:
 (1)  
The pressurization of hydraulic system B

 (2)  
The removal of pressure from hydraulic systems A, B and Standby

 (3)  
The deactivation of the leading edge flaps and slats from the trailing edge flaps

 (4)  
The installation of the leading edge flap and slat locks

 (5)  
The removal of the leading edge flap and slat locks.

 B.  
You must release the pressure from the hydraulic systems A and B and the standby hydraulic system before you do maintenance on the leading edge flap and slat control system. This is to prevent injury to persons because of accidental operation of the control system. You must put maintenance stands and equipment away from the limits of travel of the leading edge flaps and slats.

 C.  
The hydraulic system B electric pump pressurizes the hydraulic system B for operation of the leading edge flaps and slats.

 D.  
When you operate the hydraulic system B pump to pressurize the hydraulic system B, you must obey these conditions:

 (1)  
A minimum of 1675 pounds (761 kilograms) (250 gallons) of fuel is necessary in the No. 2 fuel tank to supply hydraulic fluid cooling. On hot days, or when the fuel temperature is more than 90°F (32.2°C), monitor the system B overheat indicator. Turn the switch pump off when the hydraulic fluid becomes too hot.

 TASK 27-81-00-862-015
 2.  Leading Edge Flaps and Slats Hydraulic System B Pressurization______________________________________________________________
 A.  General
 (1)  
In this procedure hydraulic system B electric pump is used to pressurize hydraulic system B.

 B.  
Special Tools and Equipment

 (1)  
F72735 - Ground Lock Assembly

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 27-81-00
 ALL  ú ú 02 Page 201 ú Jul 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 C.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 32-00-01/201, Ground Lock Assemblies

 D.  
Access

 (1)  
Location Zone
 101 Control Cabin, LH
 102 Control Cabin, RH

 E.  
Procedure

 S 862-052
 (1)  
Pressurize the Leading Edge Flaps and Slats Hydraulic System B (AMM 29-09-00/201).

 S 862-001

 (2)  
Supply electrical power (AMM 24-22-00/201).
　
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