Just to clarify; Transport Aircraft tires are limited to a taxi speed limit of 30 knots, and 35,000 feet of lineal roll. Takeoff or landing are not included in these limits.
Tires also have an absolute speed limit which is normally molded into the sidewall. 225 knots is common.
35,000 feet of lineal roll can be approached at some airport/runway situations. Denver is huge as an example. Another case would be a runway change, where the aircraft has taxied for one runway, then has to go to another for some reason, such as a wind change or incident. Consider YYZ from T1 to 05, then a runway change to 24. It is near 20,000 feet to 05 from the furtherest gates at T1; even a change to 06 is at least another 10,000 feet, perhaps more.
ACA flight, taxi speeds.
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Re: ACA flight, taxi speeds.
115b, just curious what are your options if taxi distance exceeds your 35000' limit and you don't obtain a closer rwy ?
Re: ACA flight, taxi speeds.
This is one of those things (35,000 foot taxi limit for tires) that is poorly understood in the industry. Most pilots are unaware of the limit; and there is no guidance in any AOM or FOM that I have seen. It is a limit, so there is a problem if it is exceeded.
In the case of most modern transports taxiing with all engines, the brake temps will go up in a taxi that long. the 330 is particularly touchy on brake temps if taxiied on two engines. There is a hard limit for takeoff; you just have to wait for them to cool, which takes a long time with the park brake on. No way to tell if the tires are overheated, but Nationair found out what happens if the tires are too hot.
In the case of most modern transports taxiing with all engines, the brake temps will go up in a taxi that long. the 330 is particularly touchy on brake temps if taxiied on two engines. There is a hard limit for takeoff; you just have to wait for them to cool, which takes a long time with the park brake on. No way to tell if the tires are overheated, but Nationair found out what happens if the tires are too hot.
Re: ACA flight, taxi speeds.
So then would single engine taxies be preferred?115B wrote:This is one of those things (35,000 foot taxi limit for tires) that is poorly understood in the industry. Most pilots are unaware of the limit; and there is no guidance in any AOM or FOM that I have seen. It is a limit, so there is a problem if it is exceeded.
In the case of most modern transports taxiing with all engines, the brake temps will go up in a taxi that long. the 330 is particularly touchy on brake temps if taxiied on two engines. There is a hard limit for takeoff; you just have to wait for them to cool, which takes a long time with the park brake on. No way to tell if the tires are overheated, but Nationair found out what happens if the tires are too hot.
