737 Operations Manual
Non-Normal Checklists -
Hydraulics
Copyright © The Boeing Company. See title page for details.
NNC.13.4 D6-27370-400E-TBCE
LOSS OF SYSTEM B
Condition: Both system B hydraulic pump LOW PRESSURE
lights illuminated accompanied by low system B
pressure indicates loss of system B. Other
indications include:
• system B flight control LOW PRESSURE light illuminated
• FEEL DIFF PRESS light illuminated when flaps are up.
SYSTEM B FLIGHT CONTROL SWITCH. . . . . . . . . STBY RUD
SYSTEM B HYDRAULIC PUMP SWITCHES . . . . . . . . . . . .OFF
Note: Inoperative items:
• outboard flight spoilers
• autopilot B
• yaw damper
• alternate nose wheel steering
• normal brakes.
Note: Alternate brakes are available. Engine No. 2 thrust
reverser and leading edge flaps and slats have
standby pressure. Trailing edge flaps have alternate
electrical power.
Plan for flaps 15 landing
Set VREF 15
Plan for alternate flap extension.
[Alternate extension time to flaps 15 is approximately 2 minutes. When the
leading edge devices have been extended by the alternate system, they
cannot be retracted unless hydraulic system B is operational and normal
flap operation is restored. The drag penalty with the leading edge devices
extended may make it impossible to reach an alternate field.]
Continued on next page
December 06, 2002
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