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Weight & Balance / payload "guide" for B767 (Read 6273 times)
fowler
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Weight & Balance / payload "guide" for B767
Oct 20th, 2015 at 10:53pm
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Guys, all these years with this lovely B767 and I just now quite figured it out : I became tired of beeing able to load the aircraft via ACE putting full pax and full cargo and still beeing able to have almost full tanks and still within limit of the MTOW. I just knew this is not real as all aircrafts have limitation between either full payload / full fuel. (heck even a Piper PA-28 Archer has such limations) So I did some research over the internet and I found out that the ACE is not doing a good job at computing the max payload for this aicraft (not at the defaut unit weight of the cargo container "ULD" found in the ACE) But the good news is that this default unit weight can be modified be the user. So I made a "guide" with various figures for the 2 main scenarios I'm mostly interested when I fly : a) fly at full fuel and max payload b) fly at full payload and max fuel. The part that needed research over the internet was the full payload figure, and I found them for all variants in several Boeing documents. The full payload added the the empty weight gives you the MZFW, which is the figure I found in the Boeing documents. SO here we go...
  
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Re: Weight & Balance / payload "guide" for B767
Reply #1 - Oct 20th, 2015 at 10:54pm
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B767-300ER :

Weights in pounds

Maximum Taxi Weight (MTW)                  413,000 (412.9 FMC)
Maximum Take Off Weight (MTOW)             412,000
Maximum Landing Weight (MLW)               320,000
Maximum Zero Fuel Weight (MZFW)            288,000
Empty weight :                             198'000
Maximum fuel :                             160'184 ->MAX PAYLOAD 54'816 : FULL PAX selon ACE avec 9xULD à 2'540 et 1xULD à 2'696 / équipage à 0
Max payload weight :                        90'000 ->FULL PAX selon ACE avec 9xULD à 6'450 et 1xULD à 6'600 / équipage à 0
Max fuel @ max payload                     125'000 ->78% sur les 3 réservoirs et réduire le central à 62'184
  
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Re: Weight & Balance / payload "guide" for B767
Reply #2 - Oct 20th, 2015 at 10:56pm
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B767-200ER :

Weights Pounds

Maximum Taxi Weight (MTW)                  382,000 (381.9 FMC)
Maximum Take Off Weight (MTOW)             381,000
Maximum Landing Weight (MLW)               285'000
Maximum Zero Fuel Weight (MZFW)            260'000
Empty weight :                             182'900
Maximum fuel                               160'184 -> MAX PAYLOAD 38'916 : FULL PAX selon ACE avec 9xULD à 1'424 et 1xULD à 1'574 / équipage à 0                           
Max payload weight :                        77'100 -> FULL PAX selon ACE avec 9xULD à 5'666 avec 1xULD à 5'822 / équipage à 0
Max fuel weight @ max payload              122'000 -> 77% sur les 3 réservoirs et réduire le central à 59'988


B767F :

Weights in pounds

Maximum Taxi Weight (MTW)                  413,000 (412.9 FMC)
Maximum Take Off Weight (MTOW)             412,000
Maximum Landing Weight (MLW)               320,000
Maximum Zero Fuel Weight (MZFW)            309,000
Empty weight :                             188'000
Maximum fuel                               160'184 -> MAX PAYLOAD 64'816 : 15xULD main deck à 2'880 + 15xULD lower deck à 1'440 et 1xULD lower deck à 7'216 / équipage à 0         
Max payload weight :                       121'000 -> 15xULD main deck à 5'378 + 15xULD lower deck à 2'688 et 1xULD lower deck à 13'454 / équipage à 0
Max fuel weight @ max payload              104'000 -> 65% sur les 3 réservoirs et mettre le central à 51'652
  
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Re: Weight & Balance / payload "guide" for B767
Reply #3 - Oct 20th, 2015 at 10:58pm
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Quick notes : you need to use the ACE for loading whatever payload you want (you can also edit in FSX but I find it less easy/practical) and then use FSX for adjusting the fuel load. So for each of the 767 variants above you will find the last three lines of each block :
a)Full fuel and max payload
b)Full payload
c)Max fuel at full payload

right from these lines you will find what are the figures to use in ACE to come directly to these figures, and also how to fill the tanks in FSX to come directly to the MTOW without too much tweaking... 

I hope you find it useful.

PS : I will post the same info for the 757 in the 757 thread.
  
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Re: Weight & Balance / payload "guide" for B767
Reply #4 - Oct 20th, 2015 at 11:00pm
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PS 2 : For full fuel scenarios and the figures I quoted are with 100% for each wing tank and 99.9% for center tank. For a reason I don't know FSX doesn't let you enter 100% for all the tanks. Difference is negligible/minimal
  
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Re: Weight & Balance / payload "guide" for B767
Reply #5 - Oct 20th, 2015 at 11:01pm
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PS 3 : Just a hint : when you load with ACE then save, then open your 767 aircraft in FSX to adjust whatever fuel you want, if you check the payload tab (fuel and payload menu), you would see that there is a slighly different total weight than what ACE was giving you, and this is because the pilots and attendants weights were added. I always remove all these weight as they belong in fact in the Operating Empty Weight of the aircraft (surely not Payload  Grin) For simplifications I would consider empty weight and operating empty weight similar.
  
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Re: Weight & Balance / payload "guide" for B767
Reply #6 - Oct 21st, 2015 at 5:56pm
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PS4 for the 767F cargo : when you load via the ACE the unit weight for each lower deck container and main deck container and then load your 767F, then load in "real time" the 15 lower deck containers and 15 main deck containers (is fun one time only) then save to reinitialise your flight with the new load, and if you check your aircraft fuel & payload figures, you will see your payload is a lot short of the ACE figure, this is because the ACE is missing 2 main deck containers entries. I counted only 13 entries instead of 15 loaded, probably a bug. So this is why I use a plugin weight that I enter in FSX to come up the the correct max payload. (see the details in the 767F block)

Also when changing from flight assignements (full fuel flight and then max payload for instance) instead of having to unload "live" all containers, change the unit weight in ACE then reload them again, you can leave them all boarded, change the new value of each unit in ACE, load your aircraft, open the "live" loading menu/icon then without changing anything just press "save" to reinitialise your flight with the new payload you want.
  
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