Today's Message Index:
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1. 07:24 AM - Re: wt and balance (Gardiner Mason)
2. 08:22 AM - Re: wt and balance (Daryl Medd)
Message 1
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| Subject: | Re: wt and balance |
Daryl, thanks for getting back to me. The plane was weighed with full
tanks ina level attitude and it came in 5 lbs heavier than it was before
replacing the starter and alt. with the light weight. I don't know the
CG yet, but I suspect it is going further aft. With that in mind, do you
know if you can get a field approval to mov the battery forward. It
seems to me that the STC's. for the starter and alt. would address these
issues. Cheers, Gardiner Mason
----- Original Message -----
From: Daryl Medd
To: cessna-list@matronics.com
Sent: Saturday, September 06, 2008 8:39 PM
Subject: Re: Cessna-List: wt and balance
Yes, sounds like you need some help with this.
Your mechanic will need to enter the removal and replacement of the
starter and alternator. The STC instructions likely include a note to
amend the weight and balance. There will be moment arms, weight of the
components removed, and weight of the components installed that need to
be calculated in the amendment.
The alternative to the calculated weight and balance amendment is to
reweigh the airplane as you refer to in your post. There are specific
procedures for that too. The fuel quantity has to be known precisely,
but even better is to drain all fuel. The aircraft needs to be leveled
per the service manual before weighing. You don't mention if the tail
was on the ground when you weighed it, or the airplane was level. The
manual will call for the plane to be leveled to a certain reference,
which turns out to be near a level flight attitude.
Once the new weight and balance are determined, then you can do some
sample calculations to see if the airplane is within limits with a
typical load for your mission.
Daryl
----- Original Message -----
From: Gardiner Mason
To: cessna-list@matronics.com
Sent: Saturday, September 06, 2008 1:37 PM
Subject: Cessna-List: wt and balance
I have just installed a skytec starter and a light weight
alternator. I have removed about 20 pounds from the front end ,and now I
am worried that I will be too tail heavy to carry any luggage. Oh, I
have a cessna 140 with a C90.....Is it possible to move the battery to
ahead of the firewall? Frustrated because I like to carry camping gear
behind the seats. I have not done a compleat wt n balance yet ,but with
full fuel the tail weighs 90 lbs. Any feedback would be greatly
appreciated. Gardiner Mason
href="http://www.matronics.com/Navigator?Cessna-List">http://www.matron
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
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05/09/2008 7:05 PM
Message 2
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| Subject: | Re: wt and balance |
Just google FAA STC and you'll come to a page where you can search for a
list of every STC ever approved for the 140. I don't know off hand if
there is a battery moving STC. I responded to your question mostly
because it is so important that you amend the weight and balance for
your aircraft. You need that information to ensure that you don't end
up loaded out of limits and encounter handling difficulties. I'm not
licensed to do it for you, and it's something that you need to be with
the airplane to complete.
----- Original Message -----
From: Gardiner Mason
To: cessna-list@matronics.com
Sent: Sunday, September 07, 2008 8:20 AM
Subject: Re: Cessna-List: wt and balance
Daryl, thanks for getting back to me. The plane was weighed with full
tanks ina level attitude and it came in 5 lbs heavier than it was before
replacing the starter and alt. with the light weight. I don't know the
CG yet, but I suspect it is going further aft. With that in mind, do you
know if you can get a field approval to mov the battery forward. It
seems to me that the STC's. for the starter and alt. would address these
issues. Cheers, Gardiner Mason
----- Original Message -----
From: Daryl Medd
To: cessna-list@matronics.com
Sent: Saturday, September 06, 2008 8:39 PM
Subject: Re: Cessna-List: wt and balance
Yes, sounds like you need some help with this.
Your mechanic will need to enter the removal and replacement of the
starter and alternator. The STC instructions likely include a note to
amend the weight and balance. There will be moment arms, weight of the
components removed, and weight of the components installed that need to
be calculated in the amendment.
The alternative to the calculated weight and balance amendment is to
reweigh the airplane as you refer to in your post. There are specific
procedures for that too. The fuel quantity has to be known precisely,
but even better is to drain all fuel. The aircraft needs to be leveled
per the service manual before weighing. You don't mention if the tail
was on the ground when you weighed it, or the airplane was level. The
manual will call for the plane to be leveled to a certain reference,
which turns out to be near a level flight attitude.
Once the new weight and balance are determined, then you can do some
sample calculations to see if the airplane is within limits with a
typical load for your mission.
Daryl
----- Original Message -----
From: Gardiner Mason
To: cessna-list@matronics.com
Sent: Saturday, September 06, 2008 1:37 PM
Subject: Cessna-List: wt and balance
I have just installed a skytec starter and a light weight
alternator. I have removed about 20 pounds from the front end ,and now I
am worried that I will be too tail heavy to carry any luggage. Oh, I
have a cessna 140 with a C90.....Is it possible to move the battery to
ahead of the firewall? Frustrated because I like to carry camping gear
behind the seats. I have not done a compleat wt n balance yet ,but with
full fuel the tail weighs 90 lbs. Any feedback would be greatly
appreciated. Gardiner Mason
href="http://www.matronics.com/Navigator?Cessna-List">http://www.matron
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
-------------------------------------------------------------------------
-
05/09/2008 7:05 PM
href="http://www.matronics.com/Navigator?Cessna-List">http://www.matron
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
-------------------------------------------------------------------------
-----
Checked by AVG.
05/09/2008 7:05 PM
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