Ralph Pascale

Document ID: FAA-2008-1065-0003
Document Type: Public Submission
Agency: Federal Aviation Administration
Received Date: October 16 2008, at 01:24 AM Eastern Daylight Time
Date Posted: October 16 2008, at 12:00 AM Eastern Standard Time
Comment Start Date: October 7 2008, at 12:00 AM Eastern Standard Time
Comment Due Date: November 21 2008, at 11:59 PM Eastern Standard Time
Tracking Number: 8075f9ee
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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.

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