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Forum: Tech Log

25th Feb 2017, 20:03

Replies: 8

747-400 RB211 Thrust Control From Thrust Hold (65kts)

Views: 2,877

Posted By NSEU

Thanks!.... I think it's starting to make sense. ...

Thanks!.... I think it's starting to make sense.

My interpretation: The actual OAT/TAT is locked in at HOLD and actual airspeed and altitude is used to compute theoretical changes to TAT. i.e....

Forum: Tech Log

22nd Feb 2017, 20:59

Replies: 8

747-400 RB211 Thrust Control From Thrust Hold (65kts)

Views: 2,877

Posted By NSEU

"Lock" does seem somewhat of a misnomer if the...

"Lock" does seem somewhat of a misnomer if the FAFC/ECC is still free to chase the target. All that seems to have changed between normal operation and takeoff operation is (perhaps) the rate of...

Forum: Tech Log

22nd Feb 2017, 01:57

Replies: 8

747-400 RB211 Thrust Control From Thrust Hold (65kts)

Views: 2,877

Posted By NSEU

Still trying to absorb all this excellent...

Still trying to absorb all this excellent information... It's the "lapse" rate I'm still trying to get my head around. "Lapse" I usually associate with "fall behind" not keep up with.

Does an...

Forum: Tech Log

21st Feb 2017, 23:35

Replies: 8

747-400 RB211 Thrust Control From Thrust Hold (65kts)

Views: 2,877

Posted By NSEU

P.S. From what I've read from previous posts, it...

P.S. From what I've read from previous posts, it is important for actual thrust to reach target thrust prior to reaching thrust hold. Would this suggest that if engine thrust does not reach the...

Forum: Tech Log

21st Feb 2017, 23:22

Replies: 8

747-400 RB211 Thrust Control From Thrust Hold (65kts)

Views: 2,877

Posted By NSEU

747-400 RB211 Thrust Control From Thrust Hold (65kts)

Fellow PPRuNeRs..

It's not clear from my (engineering) training manuals what happens to EPR target and actual values after engine thrust is set on the runway and the A/T mode goes to HOLD .. until...

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