Today's Message Index:
----------------------
1. 12:54 AM - Props for sale (Chris Joens)
2. 08:17 AM - Electric fuel pump cycling (Gary Giesler)
3. 01:54 PM - Re: Electric fuel pump cycling ()
4. 07:27 PM - Re: Electric fuel pump cycling (Gary Giesler)
5. 08:12 PM - Re: Electric fuel pump cycling (Tylor Hall)
6. 08:41 PM - Re: Electric fuel pump cycling (John Vormbaum)
7. 08:48 PM - Re: Electric fuel pump cycling (Keith S. Gordon)
8. 09:46 PM - Re: Electric fuel pump cycling (John Vormbaum)
Message 1
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Howdy Harry,
So this is where you hang out!
Thought I'd post these props to see if they would work for anybody.
Got a couple of complete HC-B3Z30-2's, with 10151-8R blades, and logbooks. A little
over 400 hours on a 1993 major, so obviously they should be inspected.
The props were pulled around 2003 and placed in warm storage since.
So if someone had a couple of 20 spline hubs, they could make a nice set for a
680,E.
And I may be wrong about this, but don't the 30 spline hubs fit the 560F/680F,L,P?
I may have one of them canabalized for the clamps I need on another prop I'm having
built up, so however it all works out it'll be OK.
Thanks in advance,
Chris
cjoens@gci.net
907-223-1841
Message 2
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| Subject: | Electric fuel pump cycling |
Question
Before starting the engines i am hearing a pulsing relay clicking that co
ntinues even after the flaps are retracted.The hydraulic pressure needle is
twitching around 600psi as it makes this noise. If I step on the brakes th
e pump will work continuous untill just short of redline. After the brakes
are released the pressure drops back to six hundred and the clicking relay
sound comes back. Have I just never noticed this untill now, I have owned 5
00RX for a year, or is this a problem ?
Gary
500RX--1974 500S
_________________________________________________________________
Use video conversation to talk face-to-face with Windows Live Messenger.
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_WL_Refresh_messenger_video_042008
Message 3
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| Subject: | Electric fuel pump cycling |
Gary,
I am certainly no expert, but I have owned a 500S for 3 =BD years. It
is
the electric hydraulic pump that you hear as it try sot maintain the 600
lbs. in the system prior to the start of an engine. At that time, the
engine driven pump produces around 1000 lbs. If the engine is running
and the gauge only shows 600 then it indicates a major loss of hydraulic
fluid or both pumps are not working.
It the flap lever is not in the totally off position then I have had the
same symptoms that you are having. Sometimes it is difficult to feel
the total off position of the flap handle as the detent is not that
noticeable.
I am sure others with many more years of experience will chime in an we
will all learn from it.
Don
-----Original Message-----
From: owner-commander-list-server@matronics.com
[mailto:owner-commander-list-server@matronics.com] On Behalf Of Gary
Giesler
Sent: Saturday, April 05, 2008 11:13 AM
Subject: Commander-List: Electric fuel pump cycling
Question
Before starting the engines i am hearing a pulsing relay clicking that
continues even after the flaps are retracted.The hydraulic pressure
needle is twitching around 600psi as it makes this noise. If I step on
the brakes the pump will work continuous untill just short of redline.
After the brakes are released the pressure drops back to six hundred and
the clicking relay sound comes back. Have I just never noticed this
untill now, I have owned 500RX for a year, or is this a problem ?
Gary
500RX--1974 500S
_____
Use video conversation to talk face-to-face with Windows Live Messenger.
Get started!
<http://www.windowslive.com/messenger/connect_your_way.html?ocid=TXT_TA
G
LM_WL_Refresh_messenger_video_042008>
Message 4
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| Subject: | Electric fuel pump cycling |
Don.
When the engines are driving their pumps the psi is around 1000. And the
needle is not twitching , I cant tell if the clicking relay sound is there or
not because of the noise. I will experiment with finding the flap " OFF" detent......didn't
know there was one.
Thanks
Gary
500RX
________________________________
> From: dfalik@sbcglobal.net
> To: commander-list@matronics.com
> Subject: RE: Commander-List: Electric fuel pump cycling
> Date: Sat, 5 Apr 2008 16:51:19 -0400
>
>
> Gary,
>
>
>
> I am certainly no expert, but I have owned a 500S for 3 years. It is the electric
hydraulic pump that you hear as it try sot maintain the 600 lbs. in the
system prior to the start of an engine. At that time, the engine driven pump
produces around 1000 lbs. If the engine is running and the gauge only shows
600 then it indicates a major loss of hydraulic fluid or both pumps are not working.
>
>
>
> It the flap lever is not in the totally off position then I have had the same
symptoms that you are having. Sometimes it is difficult to feel the total off
position of the flap handle as the detent is not that noticeable.
>
>
>
> I am sure others with many more years of experience will chime in an we will
all learn from it.
>
>
>
> Don
>
>
>
> -----Original Message-----
> From: owner-commander-list-server@matronics.com [mailto:owner-commander-list-server@matronics.com] On Behalf Of Gary Giesler
> Sent: Saturday, April 05, 2008 11:13 AM
> To: commander-list@matronics.com
> Subject: Commander-List: Electric fuel pump cycling
>
>
>
> Question
>
> Before starting the engines i am hearing a pulsing relay clicking that continues
even after the flaps are retracted.The hydraulic pressure needle is twitching
around 600psi as it makes this noise. If I step on the brakes the pump will
work continuous untill just short of redline. After the brakes are released
the pressure drops back to six hundred and the clicking relay sound comes back.
Have I just never noticed this untill now, I have owned 500RX for a year,
or is this a problem ?
>
>
Gary
>
500RX--1974 500S
>
> ________________________________
>
> Use video conversation to talk face-to-face with Windows Live Messenger. Get
started!
_________________________________________________________________
Going green? See the top 12 foods to eat organic.
http://green.msn.com/galleries/photos/photos.aspx?gid=164&ocid=T003MSN51N1653A
Message 5
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| Subject: | Re: Electric fuel pump cycling |
Gary,
You want to hear the hydraulic pump and see 600 psi on the gauge
before you start the engines. If the engine starts and you have no
pressure, it will roll forward unit the engine driven pump can pump up
enough pressure to make the breaks work. Rolling forward when you do
not want to can be a problem of running into something.
In the older 560/680, there is a hand pump that needs to be pumped up
to set the breaks.
Are you aware that you can pull the circuit breaker on the electric
hydraulic pump after you take off?
If you have a hose failure in flight, the electric pump will attempt
to keep the pressure up and pump all the hydraulic oil through the
broken hose? There is a reserve amount in the hydraulic tank that
would allow you to stop the aircraft is you land and push in the
circuit breaker to make the breaks work. It would be a no flap landing.
When was the last time you inspected all the hydraulic hoses? It is a
problem of aging aircraft.
Just a thought.
Tylor Hall
On Apr 5, 2008, at 8:25 PM, Gary Giesler wrote:
> >
>
>
> Don.
> When the engines are driving their pumps the psi is around
> 1000. And the needle is not twitching , I cant tell if the clicking
> relay sound is there or not because of the noise. I will experiment
> with finding the flap " OFF" detent......didn't know there was one.
> Thanks
> Gary
> 500RX
> ________________________________
>> From: dfalik@sbcglobal.net
>> To: commander-list@matronics.com
>> Subject: RE: Commander-List: Electric fuel pump cycling
>> Date: Sat, 5 Apr 2008 16:51:19 -0400
>>
>>
>> Gary,
>>
>>
>>
>> I am certainly no expert, but I have owned a 500S for 3 years.
>> It is the electric hydraulic pump that you hear as it try sot
>> maintain the 600 lbs. in the system prior to the start of an
>> engine. At that time, the engine driven pump produces around 1000
>> lbs. If the engine is running and the gauge only shows 600 then it
>> indicates a major loss of hydraulic fluid or both pumps are not
>> working.
>>
>>
>>
>> It the flap lever is not in the totally off position then I have
>> had the same symptoms that you are having. Sometimes it is
>> difficult to feel the total off position of the flap handle as the
>> detent is not that noticeable.
>>
>>
>>
>> I am sure others with many more years of experience will chime in
>> an we will all learn from it.
>>
>>
>>
>> Don
>>
>>
>>
>> -----Original Message-----
>> From: owner-commander-list-server@matronics.com [mailto:owner-commander-list-server@matronics.com
>> ] On Behalf Of Gary Giesler
>> Sent: Saturday, April 05, 2008 11:13 AM
>> To: commander-list@matronics.com
>> Subject: Commander-List: Electric fuel pump cycling
>>
>>
>>
>> Question
>>
>> Before starting the engines i am hearing a pulsing relay clicking
>> that continues even after the flaps are retracted.The hydraulic
>> pressure needle is twitching around 600psi as it makes this noise.
>> If I step on the brakes the pump will work continuous untill just
>> short of redline. After the brakes are released the pressure drops
>> back to six hundred and the clicking relay sound comes back. Have I
>> just never noticed this untill now, I have owned 500RX for a year,
>> or is this a problem ?
>>
>>
Gary
>>
500RX
>> --1974 500S
>>
>> ________________________________
>>
>> Use video conversation to talk face-to-face with Windows Live
>> Messenger. Get started!
> _________________________________________________________________
> Going green? See the top 12 foods to eat organic.
> http://green.msn.com/galleries/photos/photos.aspx?gid=164&ocid=T003MSN51N1653A
>
>
Message 6
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| Subject: | Re: Electric fuel pump cycling |
Gary,
Tylor's input has merit, and Don is on the right track. The noise you
hear is your aux hyd. pump running. You probably don't have a hose or
line problem (unless you're losing hyd. fluid) because you're
making/maintaining the correct 1,000 psi with the engine-driven pumps
and ~5-600 psi with the aux pump....and you didn't mention any red
racing stripes on the outside of the airplane in your original post.
What you have is an excessively bypassing valve in your hyd. system. My
memory is not clear enough to know if there is a way to determine if
it's a flap or steering actuator (does putting the flap handle in
neutral completely isolate the flap system from the hyd. pumps?), but
you DO have a valve that is bypassing.
This has happened to me in my 500B on occasion, the last was a few years
ago and it seemed to heal by itself.....I must have hit a big bump in a
taxiway that freed up the offending valve :-).
Tylor's comments about pulling the aux pump breaker after takeoff are on
the money. The hydraulic reservoir has a standpipe in it that limits the
amount of fluid available to the engine-driven pumps. Theoretically, in
the event of a hydraulic leak, with the aux pump off you will have fluid
left in the reservoir for brakes on landing (remember to push the
breaker in on final).
If you fail to pull the breaker after takeoff, and have a major leak,
once the standpipe level is reached, the aux pump will happily continue
to pump your valuable fluid overboard until the reservoir is dry. Ask me
how I know. Even a slow, gentle nosegear collapse can get pricey....
/John
Tylor Hall wrote:
> <tylor.hall@sbcglobal.net>
>
> Gary,
> You want to hear the hydraulic pump and see 600 psi on the gauge
> before you start the engines. If the engine starts and you have no
> pressure, it will roll forward unit the engine driven pump can pump up
> enough pressure to make the breaks work. Rolling forward when you do
> not want to can be a problem of running into something.
>
> In the older 560/680, there is a hand pump that needs to be pumped up
> to set the breaks.
>
> Are you aware that you can pull the circuit breaker on the electric
> hydraulic pump after you take off?
>
> If you have a hose failure in flight, the electric pump will attempt
> to keep the pressure up and pump all the hydraulic oil through the
> broken hose? There is a reserve amount in the hydraulic tank that
> would allow you to stop the aircraft is you land and push in the
> circuit breaker to make the breaks work. It would be a no flap landing.
>
> When was the last time you inspected all the hydraulic hoses? It is a
> problem of aging aircraft.
>
> Just a thought.
>
> Tylor Hall
>
>
> On Apr 5, 2008, at 8:25 PM, Gary Giesler wrote:
>
>> <gjgiesler@hotmail.com>
>>
>>
>> Don.
>> When the engines are driving their pumps the psi is around
>> 1000. And the needle is not twitching , I cant tell if the clicking
>> relay sound is there or not because of the noise. I will experiment
>> with finding the flap " OFF" detent......didn't know there was one.
>> Thanks
>>
>> Gary 500RX
>> ________________________________
>>> From: dfalik@sbcglobal.net
>>> To: commander-list@matronics.com
>>> Subject: RE: Commander-List: Electric fuel pump cycling
>>> Date: Sat, 5 Apr 2008 16:51:19 -0400
>>>
>>>
>>> Gary,
>>>
>>>
>>>
>>> I am certainly no expert, but I have owned a 500S for 3 years. It
>>> is the electric hydraulic pump that you hear as it try sot maintain
>>> the 600 lbs. in the system prior to the start of an engine. At that
>>> time, the engine driven pump produces around 1000 lbs. If the
>>> engine is running and the gauge only shows 600 then it indicates a
>>> major loss of hydraulic fluid or both pumps are not working.
>>>
>>>
>>>
>>> It the flap lever is not in the totally off position then I have had
>>> the same symptoms that you are having. Sometimes it is difficult to
>>> feel the total off position of the flap handle as the detent is not
>>> that noticeable.
>>>
>>>
>>>
>>> I am sure others with many more years of experience will chime in an
>>> we will all learn from it.
>>>
>>>
>>>
>>> Don
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: owner-commander-list-server@matronics.com
>>> [mailto:owner-commander-list-server@matronics.com] On Behalf Of Gary
>>> Giesler
>>> Sent: Saturday, April 05, 2008 11:13 AM
>>> To: commander-list@matronics.com
>>> Subject: Commander-List: Electric fuel pump cycling
>>>
>>>
>>>
>>> Question
>>>
>>> Before starting the engines i am hearing a pulsing relay clicking
>>> that continues even after the flaps are retracted.The hydraulic
>>> pressure needle is twitching around 600psi as it makes this noise.
>>> If I step on the brakes the pump will work continuous untill just
>>> short of redline. After the brakes are released the pressure drops
>>> back to six hundred and the clicking relay sound comes back. Have I
>>> just never noticed this untill now, I have owned 500RX for a year,
>>> or is this a problem ?
>>>
>>>
>>> Gary
>>>
>>> 500RX--1974 500S
>>>
>>> ________________________________
>>>
>>> Use video conversation to talk face-to-face with Windows Live
>>> Messenger. Get started!
>> _________________________________________________________________
>> Going green? See the top 12 foods to eat organic.
>> http://green.msn.com/galleries/photos/photos.aspx?gid=164&ocid=T003MSN51N1653A
>>
>>
>>
>>
>>
>
>
Message 7
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| Subject: | Re: Electric fuel pump cycling |
My free opinion -- and worth every penny -- is that if your flap handle is
in the neutral detent and your aux hydraulic pump is cycling quickly you sho
uld (in order of expense):
Check the nitrogen charge on the hydraulic accumulator.=C2- If just 50 psi
low, it will cause cycling.=C2- The hydraulic accumulator is high up in t
he left nacelle and has a Schraeder valve on it.=C2- When you taxi or oper
ate the flaps, do you have a hydraulic "slam?"=C2- If so, that's also a sy
mptom of low accumulator pressure.
High pressure out-put from the engine hydraulic
pumps is routed to a pressure regulator.=C2-
This pressure regulator is commonly called the accumulator=C2-by pilots.
=C2-
You should know that it is an accumulator, as well as a =9Cloading &
unloading valve=9D that keeps hydraulic system pressure even and dampe
ns pressure
surges while operating any of the hydraulically actuated components.
An
important operating tip; when is the hydraulic accumulator low?
=C2-
If you feel or hear a =9Cslam=9D during steering the
Aero Commander on the ground, the nitrogen charge=C2-in this
accumulator has dropped below the 600 psi required for normal system
operation.=C2-
If a few dollars'
squirt of nitrogen doesn't stop the cycling, the seals in the flap
& landing gear control valve assembly need to be replaced.=C2- That
really means overhaul it. =C2- That control valve assembly is under the
center pedestal, floor.
By the way, Tylor is correct about the electric aux hydraulic c/b.
Wing Commander Gordon
Life is not simple anywhere. Probably less so elsewhere.
-----Original Message-----
From: Tylor Hall <tylor.hall@sbcglobal.net>
Sent: Sat, 5 Apr 2008 8:09 pm
Subject: Re: Commander-List: Electric fuel pump cycling
=C2-
=C2-
Gary,=C2-
You want to hear the hydraulic pump and see 600 psi on the gauge before you
start the engines. If the engine starts and you have no pressure, it will r
oll forward unit the engine driven pump can pump up enough pressure to make
the breaks work. Rolling forward when you do not want to can be a problem o
f running into something.=C2-
=C2-
In the older 560/680, there is a hand pump that needs to be pumped up to set
the breaks.=C2-
=C2-
Are you aware that you can pull the circuit breaker on the electric hydrauli
c pump after you take off?=C2-
=C2-
If you have a hose failure in flight, the electric pump will attempt to keep
the pressure up and pump all the hydraulic oil through the broken hose? Th
ere is a reserve amount in the hydraulic tank that would allow you to stop t
he aircraft is you land and push in the circuit breaker to make the breaks w
ork. It would be a no flap landing.=C2-
=C2-
When was the last time you inspected all the hydraulic hoses? It is a probl
em of aging aircraft.=C2-
=C2-
Just a thought.=C2-
=C2-
Tylor Hall=C2-
=C2-
On Apr 5, 2008, at 8:25 PM, Gary Giesler wrote:=C2-
=C2-
>=C2-
>=C2-
>=C2-
> Don.=C2-
> When the engines are driving their pumps the psi is around > 1000.
And the needle is not twitching , I cant tell if the clicking > relay sound
is there or not because of the noise. I will experiment > with finding the f
lap " OFF" detent......didn't know there was one.=C2-
> Thanks=C2
-
>
Gary> 500RX=C2-
> ________________________________=C2-
>> From: dfalik@sbcglobal.net=C2-
>> To: commander-list@matronics.com=C2-
>> Subject: RE: Commander-List: Electric fuel pump cycling=C2-
>> Date: Sat, 5 Apr 2008 16:51:19 -0400=C2-
>>=C2-
>>=C2-
>> Gary,=C2-
>>=C2-
>>=C2-
>>=C2-
>> I am certainly no expert, but I have owned a 500S for 3 =C2=BD years. >>
It is the electric hydraulic pump that you hear as it try sot >> maintain t
he 600 lbs. in the system prior to the start of an >> engine. At that time,
the engine driven pump produces around 1000 >> lbs. If the engine is runni
ng and the gauge only shows 600 then it >> indicates a major loss of hydraul
ic fluid or both pumps are not >> working.=C2-
>>=C2-
>>=C2-
>>=C2-
>> It the flap lever is not in the totally off position then I have >> had t
he same symptoms that you are having. Sometimes it is >> difficult to feel
the total off position of the flap handle as the >> detent is not that notic
eable.=C2-
>>=C2-
>>=C2-
>>=C2-
>> I am sure others with many more years of experience will chime in >> an w
e will all learn from it.=C2-
>>=C2-
>>=C2-
>>=C2-
>> Don=C2-
>>=C2-
>>=C2-
>>=C2-
>> -----Original Message-----=C2-
>> From: owner-commander-list-server@matronics.com [mailto:owner-commander-l
ist-server@matronics.com>> ] On Behalf Of Gary Giesler=C2-
>> Sent: Saturday, April 05, 2008 11:13 AM=C2-
>> To: commander-list@matronics.com=C2-
>> Subject: Commander-List: Electric fuel pump cycling=C2-
>>=C2-
>>=C2-
>>=C2-
>> Question=C2-
>>=C2-
>> Before starting the engines i am hearing a pulsing relay clicking >> tha
t continues even after the flaps are retracted.The hydraulic >> pressure nee
dle is twitching around 600psi as it makes this noise. >> If I step on the b
rakes the pump will work continuous untill just >> short of redline. After t
he brakes are released the pressure drops >> back to six hundred and the cli
cking relay sound comes back. Have I >> just never noticed this untill now,
I have owned 500RX for a year, >> or is this a problem ?=C2-
>>=C2-
>>
Gary=C2-
>>
500RX>> --1974 500S=C2-
>>=C2-
>> ________________________________=C2-
>>=C2-
>> Use video conversation to talk face-to-face with Windows Live >> Messenge
r. Get started!=C2-
> _________________________________________________________________=C2-
> Going green? See the top 12 foods to eat organic.=C2-
> http://green.msn.com/galleries/photos/photos.aspx?gid=164&ocid=T003MSN
51N1653A=C2-
>=C2-
>=C2-
>=C2-
>=C2-
=C2-
=C2-
============C2-
============C2-
============C2-
============C2-
=C2-
Message 8
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| Subject: | Re: Electric fuel pump cycling |
Keith, nice! I forgot all about the accumulator....
/John
Keith S. Gordon wrote:
> *My free opinion -- and worth every penny -- is that if your flap
> handle is in the neutral detent and your aux hydraulic pump is cycling
> quickly you should (in order of expense):
>
> Check the nitrogen charge on the hydraulic accumulator. If just 50
> psi low, it will cause cycling. The hydraulic accumulator is high up
> in the left nacelle and has a Schraeder valve on it. When you taxi or
> operate the flaps, do you have a hydraulic "slam?" If so, that's also
> a symptom of low accumulator pressure.
>
>
> *
> High pressure out-put from the engine hydraulic pumps is routed to a
> pressure regulator. This pressure regulator is commonly called the
> accumulator by pilots. You should know that it is an accumulator, as
> well as a loading & unloading valve that keeps hydraulic system
> pressure even and dampens pressure surges while operating any of the
> hydraulically actuated components.
>
>
> An important operating tip; when is the hydraulic accumulator low?
>
>
> If you feel or hear a slam during steering the Aero Commander on the
> ground, the nitrogen charge in this accumulator has dropped below the
> 600 psi required for normal system operation.
>
> *
> If a few dollars' squirt of nitrogen doesn't stop the cycling, the
> seals in the flap & landing gear control valve assembly need to be
> replaced. That really means overhaul it. That control valve
> assembly is under the center pedestal, floor.
>
> By the way, Tylor is correct about the electric aux hydraulic c/b.
> **
> Wing Commander Gordon
> *
>
> Life is not simple anywhere. Probably less so elsewhere.
>
>
> -----Original Message-----
> From: Tylor Hall <tylor.hall@sbcglobal.net>
> To: commander-list@matronics.com
> Sent: Sat, 5 Apr 2008 8:09 pm
> Subject: Re: Commander-List: Electric fuel pump cycling
>
> <tylor.hall@sbcglobal.net <mailto:tylor.hall@sbcglobal.net>>
>
> Gary,
> You want to hear the hydraulic pump and see 600 psi on the gauge
> before you start the engines. If the engine starts and you have no
> pressure, it will roll forward unit the engine driven pump can pump up
> enough pressure to make the breaks work. Rolling forward when you do
> not want to can be a problem of running into something.
>
> In the older 560/680, there is a hand pump that needs to be pumped up
> to set the breaks.
>
> Are you aware that you can pull the circuit breaker on the electric
> hydraulic pump after you take off?
>
> If you have a hose failure in flight, the electric pump will attempt
> to keep the pressure up and pump all the hydraulic oil through the
> broken hose? There is a reserve amount in the hydraulic tank that
> would allow you to stop the aircraft is you land and push in the
> circuit breaker to make the breaks work. It would be a no flap landing.
>
> When was the last time you inspected all the hydraulic hoses? It is a
> problem of aging aircraft.
>
> Just a thought.
>
> Tylor Hall
>
> On Apr 5, 2008, at 8:25 PM, Gary Giesler wrote:
>
> <gjgiesler@hotmail.com <mailto:gjgiesler@hotmail.com>> >
> >
> >
> > Don.
> > When the engines are driving their pumps the psi is around > 1000.
> And the needle is not twitching , I cant tell if the clicking > relay
> sound is there or not because of the noise. I will experiment > with
> finding the flap " OFF" detent......didn't know there was one.
> > Thanks
> > Gary> 500RX
> > ________________________________
> >> From: dfalik@sbcglobal.net <mailto:dfalik@sbcglobal.net>
> >> To: commander-list@matronics.com <mailto:commander-list@matronics.com>
> >> Subject: RE: Commander-List: Electric fuel pump cycling
> >> Date: Sat, 5 Apr 2008 16:51:19 -0400
> >>
> >>
> >> Gary,
> >>
> >>
> >>
> >> I am certainly no expert, but I have owned a 500S for 3 years. >>
> It is the electric hydraulic pump that you hear as it try sot >>
> maintain the 600 lbs. in the system prior to the start of an >>
> engine. At that time, the engine driven pump produces around 1000 >>
> lbs. If the engine is running and the gauge only shows 600 then it >>
> indicates a major loss of hydraulic fluid or both pumps are not >>
> working.
> >>
> >>
> >>
> >> It the flap lever is not in the totally off position then I have >>
> had the same symptoms that you are having. Sometimes it is >>
> difficult to feel the total off position of the flap handle as the >>
> detent is not that noticeable.
> >>
> >>
> >>
> >> I am sure others with many more years of experience will chime in
> >> an we will all learn from it.
> >>
> >>
> >>
> >> Don
> >>
> >>
> >>
> >> -----Original Message-----
> >> From: owner-commander-list-server@matronics.com
> <mailto:owner-commander-list-server@matronics.com>
> [mailto:owner-commander-list-server@matronics.com
> <mailto:owner-commander-list-server@matronics.com?>>> ] On Behalf Of
> Gary Giesler
> >> Sent: Saturday, April 05, 2008 11:13 AM
> >> To: commander-list@matronics.com <mailto:commander-list@matronics.com>
> >> Subject: Commander-List: Electric fuel pump cycling
> >>
> >>
> >>
> >> Question
> >>
> >> Before starting the engines i am hearing a pulsing relay clicking
> >> that continues even after the flaps are retracted.The hydraulic >>
> pressure needle is twitching around 600psi as it makes this noise. >>
> If I step on the brakes the pump will work continuous untill just >>
> short of redline. After the brakes are released the pressure drops >>
> back to six hundred and the clicking relay sound comes back. Have I >>
> just never noticed this untill now, I have owned 500RX for a year, >>
> or is this a problem ?
> >>
> >> Gary
> >> 500RX>> --1974 500S
> >>
> >> ________________________________
> >>
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