October 14, 201312 yr Commercial Member Okay, so you would say that this is possible and there are no problems with safety? To throw some more jargon out there: the maximum aircraft weight at brake release is PERFORMANCE LIMITED. As René stated in his post, PLTOM is 286,548 kg, at Flap 15 for a 2000 m runway at sea level. It is as safe as any other depature. Best regards, Robin.
October 14, 201312 yr Okay, so you would say that this is possible and there are no problems with safety? Yes I would consider this very possible without any safety issues. A 9 hour flight would be around 80 tons of fuel (give or take). With a DOW of 165 and MTOW of 285 that leaves around 40 tonnes for payload. Say 350 pax @ 88 kg is 31T which leaves 9T for luggage which leaves 25kg per person so yes possible in my oppinion. (ours have 266 seats so figures would be 23.4T for pax so 16.6T for luggage/cargo). again this is on a standard isa day. If for instance it is warmer (30 degrees) with a lower pressure (995) but with a 5kt headwind figures would be: 280155, F20, V1 151, Vr 146, V2 156. Also APU-to-Pack would give an extra 1 tonne René Pedersen
October 14, 201312 yr Author Yes I would consider this very possible without any safety issues. A 9 hour flight would be around 80 tons of fuel (give or take). With a DOW of 165 and MTOW of 285 that leaves around 40 tonnes for payload. Say 350 pax @ 88 kg is 31T which leaves 9T for luggage which leaves 25kg per person so yes possible in my oppinion. (ours have 266 seats so figures would be 23.4T for pax so 16.6T for luggage/cargo). again this is on a standard isa day. If for instance it is warmer (30 degrees) with a lower pressure (995) but with a 5kt headwind figures would be: 280155, F20, V1 151, Vr 146, V2 156. Also APU-to-Pack would give an extra 1 tonne Hey, thank you so much for this answer! I have a question: Can you tell me what is the normal cargo weight (between the passenger luggage) of an standard sheduled flight? I mean the "extra" freight... Greetings from Germany, Maurice Kroll
October 14, 201312 yr Hey, thank you so much for this answer! I have a question: Can you tell me what is the normal cargo weight (between the passenger luggage) of an standard sheduled flight? I mean the "extra" freight... I think that would vary up to MTOW Thanks Tom My Youtube Videos! http://www.youtube.com/user/tf51d
October 15, 201312 yr The reason they do calculations is for safety. Or else they'd just stroll on to any runway and press toga. V1 would be calculated so you could stop in time for an RTO, takeoff weights etc. I just did a flight from KBOS where the runways are fairly short compared to most large international airports and had no problem. Mind you every takeoff in the 777 is sketchy for me because I'm not computing proper numbers. I don't have a topcat performance profile yet and I don't bother with the graphs. I'm guestimating haha.
October 15, 201312 yr I was lucky enough to visit Mayotte on business in the early '90s, flying in from Reunion. It is a tropical island between Madagascar and Africa so 'standard days' are few and far between, and because of the local topology, the runway is effectivly one way only for larger aircraft. Mayotte to Paris, without a refuelling stop? Brave... Paul Smith.
October 15, 201312 yr The reason they do calculations is for safety. Or else they'd just stroll on to any runway and press toga. V1 would be calculated so you could stop in time for an RTO, takeoff weights etc. I just did a flight from KBOS where the runways are fairly short compared to most large international airports and had no problem. Mind you every takeoff in the 777 is sketchy for me because I'm not computing proper numbers. I don't have a topcat performance profile yet and I don't bother with the graphs. I'm guestimating haha. I agree. I was scared that I got too close to the end of the runway in Munich on my way to Hong Kong. I used flaps 5 and I think I derated too.
October 18, 201312 yr I agree. I was scared that I got too close to the end of the runway in Munich on my way to Hong Kong. I used flaps 5 and I think I derated too. Yup. Boston for CTP I used flap 15 which is totally normal for such short runways at my load that flight. I'm too lazy to look up the proper charts and do the calculations :-) I'll wait for TOPCAT.
October 18, 201312 yr Yup. Boston for CTP I used flap 15 which is totally normal for such short runways at my load that flight. I'm too lazy to look up the proper charts and do the calculations :-) I'll wait for TOPCAT. I am also looking for TOPCAT T7 to be integrated with the dispatch PFPX . Would also be nice if there was something like in real live these A4 Company pages laminated with : STD DAY: 1013+15c Weight : XXXXXXXKG V1+VR+V2 FLAPS 5 +15 MAX certified Altitude for this weight as well LANDING PAGE on the other side :-) I know pilots use them as Quick reference guides even with ECL around Michael Moe Michael Moe
October 18, 201312 yr I am also looking for TOPCAT T7 to be integrated with the dispatch PFPX . Would also be nice if there was something like in real live these A4 Company pages laminated with : STD DAY: 1013+15c Weight : XXXXXXXKG V1+VR+V2 FLAPS 5 +15 MAX certified Altitude for this weight as well LANDING PAGE on the other side :-) I know pilots use them as Quick reference guides even with ECL around Michael Moe Sounds like a nice project. Post them up here when you finish them and we can all benefit from them. Paul Smith.
October 18, 201312 yr I use this one here : http://library.avsim.net/download.php?DLID=128375 UTOPIA: Universal Take Off Performance Information Application v 1.2 It was written for the PSS 777-200LR but for it works very good also for the PMDG 777. It calculates flaps setting , flex temp and take off performance limit (weight) . Never got wrong with a take off :-)
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