Boeing 747-400ERF Takeoff speeds calculations

Hello, how do you do. Here is a snippet on the method we use to calculate our takeoff speeds. I starts with us receiving a flight plan through our EFB’s ( Electronic Flight Bag) on our individual iPads. The initial flight plan is issued with an estimated Zero Fuel Weight(ZFW). Closer to departure around about 1.5 hours or so before departure, we are given a more accurate ZFW in order for us to calculate required fuel.(This is now done by flight planning department but also cross checked by pilots). An hour before departure we usually receive a Final Zero Fuel weight from Load control. We then use the EFB dashboard to enter this data to obtain a takeoff weight. This data is done independently by each pilot to allow for data cross check/verification. If there is a discrepancy then it would have to be resolved. (The old school way of adding ZFW to the Final Fuel load on a piece of paper or calculator to calculate weight is still not uncommon with some pilots as well😀.)
Other information used is the weather data as in Wind/Temperature/QNH and also any deferred defect that may affect takeoff performance.
Anyway- have a watch and it will give you an idea of how we work out speeds. If all iPads failed, we have to get data printed via flight plan office to aircraft.
Chi Di Gin! Later!✈️✈️✈️✈️

[@nickrynenberg4364]

Thanks for showing us how you work out the takeoff speeds, cool.

[@OClurzxy]

Thank you so much for the video! I was always wondering how it is done and here it is! Great as always, Obet!

[@elenacolon3880]

hello captain obet ; can't stop watching your great videos thanks happy flying👍

[@Skyhwkx]

Great video ❤️ much appreciated captain. Hope one day fly this queen 😭

[@pilot_obet]

You will😊✈️

[@yeahnahyeah1845]

Absolutely fantastic video! Always makes me smile to see another upload

[@annapaolagrandini1052]

Thank you Captain for clear explanations (as usual)... have a nice evening and later !

[@B747-4OO]

Thx a lot for another very interesting snippet with lot of great information!

[@KeunMikeun]

Fantastic

[@mrkc10]

Good stuff right there sir. It’s all about the numbers 👍🏻

[@dirceuluizmanfroramos9988]

Quite interesting.

[@mugundhann5905]

As usual with unusual content & much awaited video captain as I was wondering on what basis does the aircraft takes off & thank you sir

[@dongrandmaster3787]

The Opt: 1. Is it connected to the systems in the flight planning / dispatch department in HQ? 2. Does it store all parameters and performance calculations for future reference (e.g. route planning, engineering records..etc )? 3. Flight data: do they extract it from FMC upon arrival to home base ?

[@patrickmasai1141]

After ample time in the sim, we proceed to chk ride; upon v2+5: I deliberately and inconspicuously slowly reduced the fuel flow- to my surprise dismay the cadet forgot the yoke and cried out ' Engine failure, it's 4 real'... My controls, back to the sim 4 real.

[@davidpalmer9780]

So do you cross reference with the V speeds calculated by the FMC displayed on the MCDU?

[@pilot_obet]

Yes we do- during data entry.

[@CaptainSwoop]

Hello Captain. I've just discovered your channel and find it very interesting and de-mystifying. Can you tell me how the C of G figure is arrived at please? ie: onboard sensors, loadmaster sign off or such. Thanks.

[@pilot_obet]

The aircraft has a pre-determined range of Centre of gravity. This range is set by the manufacturer initially. Then the aircraft gets kitted out with the airlines seats/galleys etc if it’s a passenger jet. The C of G then repositions for the new weights and moment arm shift. Then the aircraft is loaded so the weight distribution is determined then fuel etc. the C of G is mathematically determined and a range for differs weights and fuel determined and published for a customer.

[@roshan85tc]

One quick doubt Captain, Can a 747 land over its MLW in case of an emergency? Is there any special procedure such as precautionary over weight landing?

[@veyselcicek149]

Çevrimi olmayan bir cümleyi önce bilmeliyiz bilmediğim ve lisans cevap veya yorum yapmam doğru olmaz fakat Önemli olan kazaların olmaması sadece önlem ayrıca yorumları deyil bazı önlemler ve güvenlik kontrollerini gözden geçirmek gerekir hangi delet veya hangimillet hangi dinden olursa olsun önemli deyil onemli olan kazaların önlemi.

[@Игорян747]

Thanks for the video, great! And how is the acceleration height calculated in case of failure of one engine? On what parameters does this height depend?

[@pilot_obet]

Depends mainly on obstacles in the takeoff flight path and/or noise abatement requirements. All airports are analysed by the performance department and an altitude agreed on. Usually a standard acceleration altitude at all airports is stipulated for most airports.

[@Игорян747]

@@pilot_obet 1000 ft AGL ?

[@pilot_obet]

@@Игорян747 normally yes but Milan is a bit higher due to obstacles

[@Игорян747]

@@pilot_obet Thank you. All clear. Fly safe, good luck.

[@jabriyacoop]

why not use the compare function

[@pilot_obet]

We did with final data entry in FMC

[@goodo5691]

isnt 162 a reasonable v2 speed anywhere?

[@pilot_obet]

Not always

[@leonfong4456]

Pizza, bags and back to hkg

[@MrEurocup]

I need this for FlightSimulator. TOPCAT is outdated