Yyc Aif Up To $30

[TheNoFlyZone]

"since building anything longer than that is wasting asphalt and, more importantly, money"

Great post, but with respect to the above line, may I add; 'unless you're attempting a reject from V1 as per the conditions above'.

Yes, on a longer runway, V1 is closer to Vr than on a shorter runway. However, assuming a same aircraft, V1 is different for every single runway. Be it a 6000ft runway, or a 16,000 ft one. V1 makes sure you have enough runway left in front of you to stop in case something goes wrong. Therefore, it is safe to assume that on a 14,000ft runway, V1 will not be anywhere past 7-8000 ft down the runway. (eyeballing here) Therefore V1 is nowhere near Tire speed limit of 235MPH.

But in all practicality, after some point, normally 80 kts (which is why that callout is important), the takeoff will only be rejected in case of something serious, such as engine failure, fire, wing falling off, etc. For minor malfunctions, takeoff will continue. rejecting takeoff at speeds above 80kts is not without risk.

-Up to 80kts, abort for anything

-Between 80 and V1, only abort for engine failure, fire, major malfunctions. etc

- Above V1, you continue the takeoff unless you have serious doubts about the ability of the aircraft to get airborne and stay airborne.

Thenoflyzone

[Kip Powick]

Therefore V1 is nowhere near Tire speed limit of 235MPH.

Just curious...why would the limiting tire speed be in mph?? Don't all airline transport aircraft operate using "knots" as a speed reference.

[anonymous]

Actually....the typical airliner tire is rated up to 225 mph or 195 kts...if you check the sidewall it will say it in mph....also tire spec sheets from manufacturers list the speed index in MPH

[DEFCON]

"Above V1, you continue the takeoff unless you have serious doubts about the ability of the aircraft to get airborne and stay airborne."

I can remember a reject event in YYZ involving a DC-9. The reject drill was well conducted, but when mechanical difficulties conspired with human factors the aircraft ended up going off the end of a very long runway and into the ditch. Rejected T/O's will, as often as not, present the crew with challenges that take the event outside the certification envelope's 'expected'.