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THIS IS AN UNCONTROLLED DOCUMENT.
THIS ELECTRONIC DOCUMENT MAY HAVE BEEN SUPERCEDED.
THE MOST CURRENT DOCUMENT INFORMATION IS AVAILABLE
FROM YOUR BELL HELICOPTER TEXTRON REPRESENTATIVE.
PRODUCT DATA JANUARY 2003
All fuel system switches are mounted on the overhead console. The fuel shutoff
switches are
protected by transparent covers.
DUAL SYSTEMS
In normal operation, each engine draws fuel from its' own feed tank, by the action of
the engine driven suction fuel pumps. The two under seat tanks are isolated from one
another to insure that
one fuel leak will not affect both engines. An interconnect valve
assures that all fuel is available for single engine operation. An electrical fuel shutoff
valve for each engine is located
on the forward firewall. A thermal relief valve permits
the return of fuel to the feed tanks after shutdown, removing internal pressure from the
engine fuel controls. Each feed tank incorporates a sump drain and prime pump
assembly. The prime pumps are used only
during engine starting, to purge air from the
fuel system, and are deactivated when the start cycle has been completed. The sump
drains are electrically activated by
environmentally sealed push-button switches located
low on the fuselage, just ahead of the wings, and also serve as manual defuel valves.
FUEL SYSTEM CONTROLS
SWITCHES PHOTO
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