I feel that installing GFI protectors on the fuel boost pump circuit could cause fuel
starvation to the engines during critical conditions.
During loss of all genterators (on the B727) AC power is lost at the boost pumps
and must be re-established very quickly in order to prevent engine's flame-outs.
During loss of all generators due to thunderstorms the flight engineer has to re-
establish electrical power to the aircraft very quickly. In this condition the co-pilot
has lost its instruments and unless essential power is re-established the captain
is also without instruments. When essential power is re-established there are
only two boost pumps (provided that the cross feeds are open) that are supplying
boosted fuel to the engines.
By installing the GFIs on the boost pumps, you could have a conditions where
during a loss of all generators due to thunderstorms electrical power is lost to the
boost pumps and the possiblity of the GFI tripping due to high voltage (getting hit
by lightning) will prevent the boost pumps to supply boosted pressure when
electrical power is re-established. TRIPLE FLAME OUT!!
Just leave it the way it is, it has worked fine for the last 44 years and there is no
reason to change it.
Related Comments
Total: 3
Ralph Pascale Public SubmissionPosted: 10/16/2008
ID: FAA-2008-1065-0003
Ralph Pascale
This is comment on Rule
Airworthiness Directives; Boeing Model 727 Airplanes
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Related Comments
Public Submission Posted: 10/16/2008 ID: FAA-2008-1065-0003
Nov 21,2008 11:59 PM ET
Public Submission Posted: 11/13/2008 ID: FAA-2008-1065-0004
Nov 21,2008 11:59 PM ET
Public Submission Posted: 11/26/2008 ID: FAA-2008-1065-0005
Nov 21,2008 11:59 PM ET