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Take Off Thurst Temp? (Read 1063 times)

Krake802 Full Member Offline Posts: 101 Joined: Jan 3^rd, 2019	Take Off Thurst Temp? May 7^th, 2020 at 7:21pm	Print Post
	Hello, So I just took off from Marsa Alam (HEMA) in the 763 and I was using the TOPER take off perf calc tool & it was saying that for: Information: TOW: 151.7 OAT: 32c Wind: 350*/10kt Rwy: 33 (Full runway) Cond: Dry QnH: 1011 A/C: On A/I: Off The outcome was: Flaps: 5 V1: 148Kt VR: 152Kt V2: 157Kt SelTemp: 69C Now, I set this up in the FMC and then tried to set TO/GA on the EPR & set 69C, but it only allows me up to 50C max... I'm 100% sure that the TOPER isn't spot on perfect, BUT I do feel that the 767 could produce a higher Temp Select than just 50C? Can someone share some information on this for me? Kind Regards


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Alex T Senior Member Offline Posts: 415 Location: Boston, MA Joined: Jun 21^st, 2015 Gender:	Re: Take Off Thurst Temp? Reply #1 - May 7^th, 2020 at 7:30pm	Print Post
	Krake802 wrote on May 7^th, 2020 at 7:21pm: Hello, So I just took off from Marsa Alam (HEMA) in the 763 and I was using the TOPER take off perf calc tool & it was saying that for: Information: TOW: 151.7 OAT: 32c Wind: 350*/10kt Rwy: 33 (Full runway) Cond: Dry QnH: 1011 A/C: On A/I: Off The outcome was: Flaps: 5 V1: 148Kt VR: 152Kt V2: 157Kt SelTemp: 69C Now, I set this up in the FMC and then tried to set TO/GA on the EPR & set 69C, but it only allows me up to 50C max... I'm 100% sure that the TOPER isn't spot on perfect, BUT I do feel that the 767 could produce a higher Temp Select than just 50C? Can someone share some information on this for me? Kind Regards Is TOPER based on PW4060s?


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Krake802 Full Member Offline Posts: 101 Joined: Jan 3^rd, 2019	Re: Take Off Thurst Temp? Reply #2 - May 7^th, 2020 at 8:05pm	Print Post
	Good shout, it's actually for the CF6 BUT I don't believe the PW4060 would have a 50c cap on it?


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Alex T Senior Member Offline Posts: 415 Location: Boston, MA Joined: Jun 21^st, 2015 Gender:	Re: Take Off Thurst Temp? Reply #3 - May 7^th, 2020 at 8:15pm	Print Post
	Krake802 wrote on May 7^th, 2020 at 8:05pm: Good shout, it's actually for the CF6 BUT I don't believe the PW4060 would have a 50c cap on it? The company I have info for only operates one type of engine so I can't say that I know! I also don't know that if 50*C happens to be the 25% max reduction so that's why it won't go any higher? Maybe someone else can chime in, but the type of engine definitely makes a difference, especially if one uses N1 and the other uses EPR.


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Krake802 Full Member Offline Posts: 101 Joined: Jan 3^rd, 2019	Re: Take Off Thurst Temp? Reply #4 - May 8^th, 2020 at 4:10pm	Print Post
	Alex T wrote on May 7^th, 2020 at 8:15pm: Krake802 wrote on May 7^th, 2020 at 8:05pm: Good shout, it's actually for the CF6 BUT I don't believe the PW4060 would have a 50c cap on it? The company I have info for only operates one type of engine so I can't say that I know! I also don't know that if 50*C happens to be the 25% max reduction so that's why it won't go any higher? Maybe someone else can chime in, but the type of engine definitely makes a difference, especially if one uses N1 and the other uses EPR. Interesting, thank you for the information. - I'm intrigued to see where CS got the information to limit the SelTemp to 50c from? I could be completely wrong but would be nice to see something for this or if it's actually a bug? I tried looking through the manuals, mainly at IV but couldn't find anything on it?


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Angel of Attack Full Member Offline Posts: 249 Joined: Dec 15^th, 2019	Re: Take Off Thurst Temp? Reply #5 - May 9^th, 2020 at 4:55am	Print Post
	In our company's FPPM for 4060, the Assumed Temp Limit is above 70C for near sealevel and still over 50C at 9000', so I thinks it can go higher? As the 25%, it's controller by FMC, if 50C already gives you 25% derate, you can still input 70 and get the same EPR by FMC. But still, it could be a company option.


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Krake802 Full Member Offline Posts: 101 Joined: Jan 3^rd, 2019	Re: Take Off Thurst Temp? Reply #6 - May 9^th, 2020 at 3:55pm	Print Post
	Hmmm, well I was at EGKK earlier with an OAT of 23c and just wanted to see what the Temp Select I could get max was 49c this time... Seems that it's dependent on OAT.... Strange? I just set TO 1 for T/O today and left the temp sel alone.


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