A aviation & planes forum. AviationBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » AviationBanter forum » rec.aviation newsgroups » Owning
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

Wet Signature on W&B?



 
 
Thread Tools Display Modes
  #1  
Old April 15th 04, 04:29 AM
MikeM
external usenet poster
 
Posts: n/a
Default

Tony Cox wrote:

"mikem" wrote in message
...

The proceedure for backing the weight of fluids out
of the W&B calculation varies by model year (or
serial number range). The proceedure is specified
(By Cessna) in the 182's Type Data Sheet, which
your IA should be looking at during an annual inspection.
I have a copy of the TDS in my logs with all of the relevant
parts high-lighted for my L model.



I didn't realize it was model year specific, but from my
Type Data Sheet the procedure is to drain all the
fuel, which of course wasn't done. Hence the 60lbs discrepancy.



If the AP that weighed it is still around, then print out
the TCDS specific to your model year, recompute the W&B to
your favor, take it to the AP. He/she should be willing to
sign the corrected WB at no charge. If not, ask if you should
take it to the FSDO to have it recomputed...

MikeM

  #2  
Old April 15th 04, 02:25 PM
Tony Cox
external usenet poster
 
Posts: n/a
Default

"MikeM" wrote in message
...
Tony Cox wrote:

I didn't realize it was model year specific, but from my
Type Data Sheet the procedure is to drain all the
fuel, which of course wasn't done. Hence the 60lbs discrepancy.



If the AP that weighed it is still around, then print out
the TCDS specific to your model year, recompute the W&B to
your favor, take it to the AP. He/she should be willing to
sign the corrected WB at no charge. If not, ask if you should
take it to the FSDO to have it recomputed...


The weighing was 10 years ago in Texas somewhere. I'm not
sure how he could sign a corrected W&B anyway, without me
completely draining and refilling the nominally 79 gal tanks to
get an exact measure. And then, wouldn't this have to be
done by another A&P? If I approached FSDO, they may just
decide to ground me for having an invalid W&B.

How much is a W&B anyway? Might be easier to just reweigh
the bugger here in Las Vegas.


  #3  
Old April 15th 04, 03:13 PM
mikem
external usenet poster
 
Posts: n/a
Default



Tony Cox wrote:

How much is a W&B anyway? Might be easier to just reweigh
the bugger here in Las Vegas.


Our "SLC Hangar Rats" group rented the scales and weighed
six aircraft in one afternoon. Our AI supervised and
signed the paperwork.

Last time I had it done by an on-field business, it
cost about $150. Call around. Btw, the standard practice
seems to be not to actually drain all of the fluids;
rather, the fluids are "backed out" of the calculations
to get the "empty weight and moment".


MikeM

  #4  
Old April 15th 04, 04:29 PM
Tony Cox
external usenet poster
 
Posts: n/a
Default

"mikem" wrote in message
...

Last time I had it done by an on-field business, it
cost about $150. Call around. Btw, the standard practice
seems to be not to actually drain all of the fluids;
rather, the fluids are "backed out" of the calculations
to get the "empty weight and moment".


That's how I got into this conversation in the first
place, and why I think my existing W&B is out!


  #5  
Old April 15th 04, 08:09 PM
MikeM
external usenet poster
 
Posts: n/a
Default

Tony Cox wrote:

That's how I got into this conversation in the first
place, and why I think my existing W&B is out!


I thought that your point was that the AP who did the last
W&B weighed it with the fluids in place, but then subtracted
the "consumable fluids", but forgot to account for the "unusable"
fluids?

The differences in weighing proceedures shown for various models
on the 182 TCDS either call for computing a "dry" weight, or
a "wet" weight where the aircraft is ready to fly, but contains
only the "unusable fluids".

I cannot conceive a situation where the capacity of your fuel tanks
could change by ~ 10 gallons unless some major mods were done to
the fuel system, i. e. plastic liners inplace of bladders, etc.

The "unusable" fuel in my 182 is only 3 gal (79 usable, 82 total),
so even if the AP did the calc wrong, we would be quibling about
only ~ 18lbs. How you think you got screwed out of 60lb?

MikeM

  #6  
Old April 15th 04, 08:59 PM
Tony Cox
external usenet poster
 
Posts: n/a
Default

"MikeM" wrote in message
...

The "unusable" fuel in my 182 is only 3 gal (79 usable, 82 total),
so even if the AP did the calc wrong, we would be quibling about
only ~ 18lbs. How you think you got screwed out of 60lb?


I added all the mods that had happened over the years to the
data sheet W&B (with the exception of a paint job, which I assumed
ended up being a wash). There was a 60lb difference, which I
attribute to the A&P mathematically subtracting 79 gals of fuel
when there was actually more). I assume that the 10 gals difference
that this represents is made up of some unusable (which the A&P
forgot to account for) and some extra buffer courtesy of Cessna.
The POH claims 5 gals unusable. Also, I drained the tanks once
for an SB (and for fun) when the 'stick' indicated 20 gals. I drained
nearly 7 5gallon drums worth.


 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
How long to keep VOR check records? Ross Oliver Instrument Flight Rules 27 April 10th 04 06:57 PM
F-22 Lies robert arndt Military Aviation 59 January 18th 04 05:43 AM
D'Amato's Role Investigated in La Guardia Airport Deal Roy Smith General Aviation 0 December 25th 03 05:47 AM
Flyong from Toronto (Ontario) to Pitsburg Intl Anthony Acri Instrument Flight Rules 3 July 26th 03 05:28 PM


All times are GMT +1. The time now is 04:26 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004-2025 AviationBanter.
The comments are property of their posters.