Does the A330 use flex when it is hot??

[Robini]

Hello,
As the headline said does the A330 use flex when it is hot?
I took off from HKT with an A333 from VKG and she seemed to be
pretty heavy, i guess that the weight was around 225 t...
Anyway, when it is hot as it is in Thailand does the A330 use FLEX
when the OAT is 25 degress celcius,sea level and a 3000 m runway??

Thanks

[BerksFlyer]

How can you guess what the weight was without knowing fuel, passenger and cargo figures?

[Robini]

I dont know how heavy the plane was, and i didnt said that either but i
guess that the weight was around that.
As i said i dont know the fuel,passenger and cargo figures for sure it was
just a guess.
I know how much pax it was and about how many tones of fuel that they
had and i know about how much cargo.

[K.Whyjelly]

Anyway, when it is hot as it is in Thailand does the A330 use FLEX
when the OAT is 25 degress celcius,sea level and a 3000 m runway??

The short yet sweet response is yes. Don't have relevent Take Off Docs to hand to quote verbatim but we do flex in hot locations if all parameters are met.

[Robini]

But at hot climates the takeoff thrust is lower isnt it?
If N1 is only 95% at full thrust isnt it best to use full thrust then?
If im wrong how much of N1 is required to lift off the A330 at these
conditions??

Thanks for your answers!

[wizo]

Whats flex ?

[Robini]

Flex is reduced thrust, and is often used to ''save'' the engines life
If you often use TOGA it is bigger chance to an engine problem.
I hope that this explained a little bit

[jonesthepilot]

The A330 is a wonderfully overpowered airplane. 'Flex Thrust' is a method of tellng all those fantastic computers that the OAT is higher than it actually is. The engines then 'back off a notch' so they don't exceed EGT limits. The 'Flex Temp' is a result of all the usual perf criteria: Rwy length, airport Alt, obsatcles, TOM, QNH etc. Bottom line is, why cane the engines when you can achieve perf A performance and extend engine life and maintenance intervals etc?

[Robini]

Yeah, i can agree that the A330 is pretty overpowered.
Now im totally OT but when im talking about flex i must ask one thing
about the A330. the question is when the A330 took off from VXO
(the rwy is 2100 m) she used 1400 m and were going to 6 h.
Do you think that was an TOGA takeoff??

[wizo]

Thanks Guys

[Capn Bloggs]

The engines then 'back off a notch' so they don't exceed EGT limits.

[barit1]

The engines then 'back off a notch' so they don't exceed EGT limits.

If the engines are in good health they shouldn't reach the EGT limit anyway, even on a very hot day.

But if r/w available, TOGW, obstacles etc. permit, then it's prudent to use flex to bring EGT back down as much as feasible. It's less of a safety issue than an economic one; keep engines in shape longer, with attendant longterm fuel savings and maintenance cost benefit.

[Capn Bloggs]

Thank you barit1

[A330AV8R]

Robini

Clearly urestions and answers just display your ignorance . . . . I mean cmon , are you really flying the bus or some Flight simulator version of it ?

first of all to get your basics right when the A330 takes off at a lower than MTOW it can meet the required performance with a reduced thrust for that weight ,this is callef FLEX TAKEOFF

By playing with the assumed temp which you Insert into the MCDU and by playing I mean checking it on the LPC or the Charts whatever your company uses you get the desired power . . . thats the FLEX TEMP

now to answer your original Question , YES the A330 can and does perform a flex t/o when its hot under the right conditions !!!

wheres the debate or the problem ?? no wait lemme guess ......

[Mercenary Pilot]

If you look at his profile it does say 14 years old.....Last time I checked, you have to be at least 18 to fly a REAL A330.

[Dani]

Even if he's a young enthusiast, he's allowed to ask this question.

So here is the answer:

A330 does flex take-off like any other airliner. It all depends on how heavy she is and how the atmospheric conditions are. If you are close to the max take-off mass, and it's hot, you can safely assume that there isn't much to flex. Otherwise, flex is very common and you flex more often than not.

Just by watching the aircraft lifting off and by counting the occupied seats, you cannot assume if it's flex or max. The trick behind flex is that you flex that much that you just make it off the runway (or stop her in case of failures before V1). So in the ideal case the aircraft always "seems pretty heavy", no matter if she is heavy or not. If you would take off with a flex value other than optimal, you would give away precious fuel and engine life time. It's all calculated to be safe, economic and efficient.

hth,
Dani

[Robini]

Dani thanks for your answer

For all others: YES im 14 years old.
Airfranz: Why be so haughty, it was just a normal question?

//Thanks for all help