GE engines not displaying EPR
15:59:58 CAM-2 God, look at that thing. That don't seem right, does it? Ah, that's not right.
16:00:09 CAM-1 Yes it is, there's eighty.
16:00:10 CAM-2 Naw, I don't think that's right. Ah, maybe it is.
16:00:21 CAM-1 Hundred and twenty.
16:00:23 CAM-2 I don't know.
16:00:31 CAM-1 V1. Easy, V2.
Join Date: Jan 2020
Location: 900m
Posts: 0
Likes: 0
Received 0 Likes
on
0 Posts
Synchronising EPR rated engines
The JT8-D 209-219 engines on the MD-80 series had a synchroniser.
Positions were Off, N1 and N2.
This was a big help in reducing harmonic beat frequency especially in the tail section, where the proximity of both engines was a problem.
Usually the N1 position provided the better result.
Positions were Off, N1 and N2.
This was a big help in reducing harmonic beat frequency especially in the tail section, where the proximity of both engines was a problem.
Usually the N1 position provided the better result.
EPR cross check with N1. That can be a bit "iffy" because it doesn't vary much in % indication for changes at high thrust settings, although a relatively big shortfall will be obvious. Best use fuel flow too. Any jet engine design, for a given intake air density (pressure & temp & ram rise) will give a thrust output directly proportional to the fuel supplied to it, (fuel/ air ratio) so know what number to normally expect, and if you get something like that with your primary parameter set, then you are getting the thrust.
Using N1 only engines it's the only parameter you can confidently use for a cross check, but it works.
With a bit of experience, when not using autothrottle, you can set certain fuel flows to get thrust appropriate for a particular phase of flight too, final approach for example.
Using N1 only engines it's the only parameter you can confidently use for a cross check, but it works.
With a bit of experience, when not using autothrottle, you can set certain fuel flows to get thrust appropriate for a particular phase of flight too, final approach for example.
Last edited by Private jet; 5th Aug 2020 at 14:39.
With a great degree of respect sir it's not a matter of votes. This isn't a political justification of individuals self interest that occurs in Jetblast. It's the fact of the matter, it's science, engineering, operational reality. That's it.
Private Jet... When I put a 
that means that the statement is a joke and not to be taken seriously.
that means that the statement is a joke and not to be taken seriously.Last edited by Pugilistic Animus; 9th Aug 2020 at 19:21.
