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Author Topic: [-] A350 vs A346 runway requirements  (Read 889 times)

Offline Tim

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[-] A350 vs A346 runway requirements
« on: March 02, 2015, 05:01:27 PM »
When I'm trying to open new flight from IAH to ABZ, system tells me that A346HGW will be limited to ~400 pax. But A350 (both -800 & -900) will be unable to fly this route due to runway requirements.

After checking new aircraft page, I found that rwy req is 2920m for A346 & 2810m for A358.

So, in theory, if A346HGW / A346 are able to fly this route, A358 should be able too (?)

« Last Edit: January 15, 2016, 12:11:47 PM by sami »

Offline schro

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Re: A350 vs A346 runway requirements
« Reply #1 on: March 02, 2015, 07:00:02 PM »
Check the runway length at ABZ

Offline wildavidson

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Re: A350 vs A346 runway requirements
« Reply #2 on: March 02, 2015, 07:06:25 PM »
Check the runway length at ABZ
Yeah its too small. Only 1829m

Offline Tim

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Re: A350 vs A346 runway requirements
« Reply #3 on: March 02, 2015, 07:48:12 PM »
But A346 is still able to use it fully loaded, while A350 isn't.

Offline wildavidson

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Re: A350 vs A346 runway requirements
« Reply #4 on: March 02, 2015, 08:04:09 PM »
But A346 is still able to use it fully loaded, while A350 isn't.
Check the return leg.

Offline schro

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Re: A350 vs A346 runway requirements
« Reply #5 on: March 02, 2015, 10:11:40 PM »
But A346 is still able to use it fully loaded, while A350 isn't.

Different aircraft have different takeoff requirements for short field runways like ABZ. For example, the 757 can take off fully loaded from a runway the size of a postage stamp, yet a 707 can't.

Offline Tim

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Re: A350 vs A346 runway requirements
« Reply #6 on: March 03, 2015, 02:54:07 PM »
Different aircraft have different takeoff requirements for short field runways like ABZ. For example, the 757 can take off fully loaded from a runway the size of a postage stamp, yet a 707 can't.

Yes, I understand it. But runaway requirements is the same according to game data.

Offline Sami

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Re: A350 vs A346 runway requirements
« Reply #7 on: March 03, 2015, 03:16:03 PM »
The calculation for runway requirement is done partly based on the range of the plane, since the system needs to figure out how much fuel the plane needs for the route, and from there it figures the takeoff weight of the plane for that route.  The data based on rwy requirements is simple (no detailed charts like with payload vs. range data), and in some borderline cases it does not always perform perfectly.

But don't see directly why it says the other is not capable of anything, while other is. So needs investigation later on.

Offline Sami

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Re: A350 vs A346 runway requirements
« Reply #8 on: January 15, 2016, 12:11:43 PM »
The difference here is logical:

A340-600 MTOW is 380 000 kg and the takeoff field length at MTOW is 2 920 m.
A350-800 MTOW is 248 000 kg and takeoff length at MTOW is 2 810m.

The system calculates the assumed TOW for the route, in this case for a 4000 nm route. Since both aircraft have a range of 7000-8000nm they will not be near to the MTOW (since less fuel is required). So then the assumed takeoff length requirement is calculated based on the distance of this route (assumed TOW of the plane) in relation to the MTOW takeoff field length. So with this numbers the A350 does not have relatively so good runway performance than A340-600 and that's why the -600 is able to depart from a limited runway when the plane is not at full takeoff weight ...

=> seems to be logical but like mentioned the runway calculation is simple and may not be fully accurate in all borderline cases.

 

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