Author Topic: D-TO assumed temp for FF 777  (Read 3943 times)

Offline Brazen

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D-TO assumed temp for FF 777
« on: August 31, 2014, 08:54:57 PM »
I often get an assumed temperature of 70C to be put in for a D-TO. However, the FF777 doesn't accept this value. It does take 60C. Would it be possible to restrict this somewhere? Alternatively, if I'm missing something, someone please point me in the right direction.

Thank you.

Offline srcooke

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Re: D-TO assumed temp for FF 777
« Reply #1 on: September 01, 2014, 10:49:02 AM »
What is FF 777?

Topcat has a beta template for the PMDG 777 which can accept 70C.
Regards
Stephen Cooke

Offline Brazen

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Re: D-TO assumed temp for FF 777
« Reply #2 on: September 01, 2014, 12:33:55 PM »
FF = FlightFactor. A group that develops for X-Plane.

http://flightfactor.aero/

Offline srcooke

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Re: D-TO assumed temp for FF 777
« Reply #3 on: September 01, 2014, 01:19:35 PM »
From the FCOM:

Quote
The maximum thrust reduction authorized is 25 percent below certified rating.

Quote
Valid entries are 0 to 99 degrees C

Whether you can enter 70C is going to depend on many variables.
Regards
Stephen Cooke

Offline Brazen

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Re: D-TO assumed temp for FF 777
« Reply #4 on: September 02, 2014, 09:54:45 AM »
So you're saying that TOPCAT can't handle all those variables and gives us a value we can't input? Or, is it the T7 that doesn't calculate it properly? They both use the same weather.

This is becoming one of those point the finger threads.

Having a way to restrict it to a top value would solve it, though ...

Offline srcooke

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Re: D-TO assumed temp for FF 777
« Reply #5 on: September 02, 2014, 02:06:38 PM »
TOPCAT can and does handle the variables.

Is the FMS taking into account the TORA ? Is the FMS aware of obstacles  as is TOPCAT ?

The assumed temperature calculation is going to take into account the above plus GW, OAT, airport elevation and cannot exceed the 25% of rating.

Attached are images of TOPCAT setup for 31L JFK indicating a 70C derate, the FMC with that 70C entered and also just to show it can be done 99C.

This in the PMDG77L, no idea about the FF-777

« Last Edit: September 02, 2014, 02:08:54 PM by srcooke »
Regards
Stephen Cooke

Offline Brazen

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Re: D-TO assumed temp for FF 777
« Reply #6 on: September 02, 2014, 03:19:04 PM »
I get the same result with the PMDG, which is why I asked about the FF 777 ...

Offline srcooke

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Re: D-TO assumed temp for FF 777
« Reply #7 on: September 02, 2014, 06:16:00 PM »
Perhaps your best of asking FF why their 777 doesn't accept the 'Valid entries of 0 to 99 degrees C' as published in the FCOM.

You know TOPCAT provides a 70C figure, the PMDG designed against Boeing data accepts 70 C so!
Regards
Stephen Cooke

Offline Brazen

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Re: D-TO assumed temp for FF 777
« Reply #8 on: September 02, 2014, 11:27:09 PM »
What makes you think I didn't? I take it where I can get it. :)

Offline srcooke

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Re: D-TO assumed temp for FF 777
« Reply #9 on: September 03, 2014, 09:22:19 AM »
And FF confirmed their model of the 777 can accept the range of 0-99C ?
Regards
Stephen Cooke