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nuckolls.bob(at)aeroelect
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 Posted: Mon Dec 08, 2008 3:23 pm Post subject: Food For Thought |
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At 02:38 PM 12/8/2008, you wrote:
| Quote: | This looked like a good idea to consider for the Z-diagram library, or at least kick around here...
-Bill B
---------- Forwarded message ----------
From: Valentine Kozak <hangar_p1(at)yahoo.com (hangar_p1(at)yahoo.com)>
Date: Mon, Dec 8, 2008 at 2:53 PM
Subject: [OhioValleyRVators] Food For Thought
To: OhioValleyRVators(at)yahoogroups.com (OhioValleyRVators(at)yahoogroups.com)
I heard of a recent incident where an RV made an off airport landing
due to a failure of an engine driven fuel pump. Maybe someone was
just "joking" around but consider the following.
If the boost pump was wired so that whenever the fuel pressure
dropped below a preset value (around 15-20 psi for fuel injected
engines) the pump would run without intervention of the pilot.
|
<snip>
| Quote: | Just an idea to make things a little easier on the pilot.
Val Kozak |
What you've hypothesized has been done. Other airplanes
I've flow call for the boost pump to be ON for takeoff
and approach to landing. The times I've allowed a tank
to run dry en route, the boost pump switch was turned on
before the tank was switched.
If this guy lost power and had enough altitude to
effect a choice of landings, he certainly had enough
time to get a fuel pump turned on. This is a case where
adherence to abnormal ops check lists is a pretty
inexpensive alternative to power-off, off-field
landings.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
[quote][b]
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schaefer(at)rts-services.
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| Posted: Tue Dec 09, 2008 4:42 pm Post subject: Food For Thought |
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The Cessna 400 has a “High Pump Enable” that is on during takeoff and climbs to 10,000’. Off otherwise.
Actually they are on “Low On” over 10,000’ for vapor suppression.
During the “Enable” a low fuel pressure will cause the external fuel pump to run in “High” mode. This
Is latched until the “High Pump Enable” is set to off.
You must be able to disable a latched fuel pump. Some continental engines do not like high fuel pressures when the
Throttle is not wide open. They can flood or die from being to rich. This is typically from a poor setup.
The problem is that there are lots of these engines that have poor setups!
You might want to check to see if you can run your engine at idle power with the fuel pump on.
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Robert L. Nuckolls, III
Sent: Monday, December 08, 2008 5:23 PM
To: aeroelectric-list(at)matronics.com
Subject: Re: Food For Thought
At 02:38 PM 12/8/2008, you wrote:
This looked like a good idea to consider for the Z-diagram library, or at least kick around here...
-Bill B
---------- Forwarded message ----------
From: Valentine Kozak <hangar_p1(at)yahoo.com (hangar_p1(at)yahoo.com)>
Date: Mon, Dec 8, 2008 at 2:53 PM
Subject: [OhioValleyRVators] Food For Thought
To: OhioValleyRVators(at)yahoogroups.com (OhioValleyRVators(at)yahoogroups.com)
I heard of a recent incident where an RV made an off airport landing
due to a failure of an engine driven fuel pump. Maybe someone was
just "joking" around but consider the following.
If the boost pump was wired so that whenever the fuel pressure
dropped below a preset value (around 15-20 psi for fuel injected
engines) the pump would run without intervention of the pilot.
<snip>
Just an idea to make things a little easier on the pilot.
Val Kozak
What you've hypothesized has been done. Other airplanes
I've flow call for the boost pump to be ON for takeoff
and approach to landing. The times I've allowed a tank
to run dry en route, the boost pump switch was turned on
before the tank was switched.
If this guy lost power and had enough altitude to
effect a choice of landings, he certainly had enough
time to get a fuel pump turned on. This is a case where
adherence to abnormal ops check lists is a pretty
inexpensive alternative to power-off, off-field
landings.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------- | Quote: | | http://www.matronics.com/contribution |
01234567890123
[quote][b]
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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