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#1
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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
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"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
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![]() 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
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"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
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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
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"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. |
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