Today's Message Index:
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1. 12:40 PM - wt and balance (Gardiner Mason)
2. 05:39 PM - Re: wt and balance (Daryl Medd)
Message 1
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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
Message 2
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| Subject: | Re: 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
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Checked by AVG.
05/09/2008 7:05 PM
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