MD-11 Flight Crew Operations Manual
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Fuel -
Description and Operation
Fuel.10.12
When dump is discontinued (the dump valves are commanded closed) the FSC
will discontinue its dump follow-up procedure in a controlled manner so as not to
interfere with the shutdown sequence of the dump system.
The FSC will exit the dump state when any of the following conditions are met:
• 12 seconds have passed since the dump valves were commanded closed.
• A reset interrupt occurs.
• The FUEL DUMP EMER STOP switch is pushed.
The FSC must support engine operation before, during, and after fuel dump. If the
FSC is in auto mode when the dump state is exited, it will immediately resume fuel
system control. If the FSC is in manual mode at the end of dump, the fuel system
will be configured to the last state commanded from the FUEL control panel.
The CG may move slightly out of range (usually forward) during fuel dump. If the
FSC is in auto mode, after the completion of the dump process, the fuel remaining
on board will be rescheduled. If the FSC is in manual mode, the flight crew must
reschedule fuel manually.
During fuel dump operation, the CG OUT OF LIMITS alert may be displayed.
Shroud and Drain System
The shroud and drain system consists of component, fuel line and coupling
shrouds, and their respective drains. The drains terminate at two push-to-drain
valves and are vented to an overboard drain mast on the lower aft fuselage. At the
rear spar of the outer wing, all electrical feed-thrus are shrouded and drained
together with the components and electrical feed-thrus of center wing rear spar.
The push-to-drain valve for this part of the system is located forward of the center
wheel well.
Fuel Vent System - Wing
The wing fuel tank vent system is an open system which allows airflow from the
tank during fueling, airflow into the tanks during fuel usage, fuel dumping, aircraft
climb and descent, or flow overboard during a fueling overfill condition (failed
open fill valve).
The system prevents tank pressures from exceeding structural limits. The vent
outlet is in the bottom wing surface. It is non-icing and drip-free. It is remote from
the wing tip and wing edges to avoid those areas which are most subject to
lightning strike or streamering.
October 02, 2006
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