definition of a take off

[dancia]

need some help guys....what is the definition of a take off? where can i find the black and white of it? an aircraft has lined up but has not commenced its roll...due to technical it requests to taxy off the runway...does this consitute a rejected take off?:confused: :confused:

[eyeinthesky]

Don't know where it is written, but my understanding would be as follows:

A take-off does not commence until take-off power has begun to be applied with the intention of getting airborne. A rejected take-off can occur from that point until airborne. It does not necesarily have to be a screaming stop. In some cases the take-off may be rejected very early (such as a configuration discrepancy warning which activates as soon as the throttles pass a certain setting) or very late (when the hedge at the end of the farm strip suddenly looms very large and you don't look like getting over it!)

The situation you describe would not consititute a rejected take-off.

[Tower Ranger]

Dancia, the situation you discribe is known locally as a Dash 8 Q400 !!

[letMfly]

Dancia,

Your situation isn't a rejected take-off. However, depending on the type of technical problem (e.g. engine failure), a runway inspection should be carried out.

Regards

letMfly

[Barnaby the Bear]

I am not sure which angle you are coming from. Do you want to know for some sort of pilots/tech log, or just curious?
I would have thought that a take off would be from the moment take off power is applied. But a rejected take off could be from the time a pilot has completed his pre-take off checks and reported ready for departure, then reports tech.
As you can see, I am about as useful as a do-nut. :}

[hangten]

a little off subject but some may remember that interestingly according to the word of the law an aircraft is deemed 'in flight' when:

in the case of a piloted flying machine, from the moment when after the embarkation of the it's crew for the purpose of taking off it first moves under it's own power,

until the moment when it next comes to rest after landing.

ie from first taxi after push until pulling onto stand. what's that all about...?

[Frunobulax]

I believe it's about insurance.

[Dances with Boffins]

Positive rate of climb on two instruments. Anything else is just fast taxying.:E

[hooplaa]

An aircraft is deemed airborne when the nose wheel lifts off, thats the time for ATC to commence vortex wake timing (unlike pilots who deem vortex timimg to commence the moment the aircraft starts rolling- but thats another debate!)

An aircraft is deemed to have commenced fa flight at the time the wheels start moving off the ramp, whether that be starting pushback or taxi straight off

An aircraft would be deemed to have abandoned take off at any point after the clearance for take off has been issued. If the pilot wishes to vacate a runway before that clearancwe is issued, its not considered to have abandoned take off. However, if the reason for non departure is likely to have contaminated the runway then a runway inspection will be requested

Does that help?

see the ANO for the legal wording/advice:ok:

[Scott Voigt]

In the US there is debate going on right now about the meaning of airborne... Some say that it is when the nose wheel comes up and some say it's when all the wheels come up. We are waiting to see what Flight Standards comes up with...

regards

Scott

[tmmorris]

Hangten - it's also about pilots logging flight time ('brakes off to brakes on').

Tim

[aerojul]

the TO distance is from brake off to 50ft after lift off.
for a rolling TO it begins at the TO power initialisation.

[I'm not joking sir]

An aircraft is deemed to have commenced fa flight at the time the wheels start moving off the ramp, whether that be starting pushback or taxi straight off

Not pushback. Aircraft is deemed to be in flight... "when it first moves under its own power for the purpose of taking off until the moment when it next comes to rest after landing". And I remembered that!

(The only other thing I remember from the last few weeks is the one about not being able to drop animals from an aircraft "whether or not attahced to a parachute"!)