Problems with altitude in datastream

[Etienne]

Hi

I have had an issue since the latest firmware update (the HSI one) where the altitude in the datastream flicks between pressure altitude (QNH 1013) and actual altitude (QNH 1031 in the example below)... 5 frames have pressure altitude and 5 frames have actual... When I change the QNH to 1013, then the problem goes away because I'm always outputting "pressure altitude".

Is this intentional? If it is, then great - this solves the problem of getting the pressure altitude in the datastream, but I think that I'm the only one who will think so :

See below - the altitude is in bold:

20233045+072+00040020000+1667+000+01+1099005BFE019F
20233046+072+00040020000+1510+000+01+1099005BFF0194
20233047+072+00040020000+1510+000+01+1099005BFF0195
20233048+072+00040020000+1510+000+01+1099005BFF0196
20233049+072+00040020000+1510+000+01+1099005BFF0197
20233050+072+00040020000+1510-001+01+1099005BFF0192
20233051+072+00040020000+1667-001+01+1099005BFE019F
20233052+072+00040020000+1667-001+01+1099005BFE01A0
20233053+072+00040020000+1667-001+01+1099005BFE01A1
20233054+072+00040020000+1667-001+01+1099005BFE01A2
20233055+071+00040020000+1667+000+01+1099005BFE019F
20233056+071+00040020000+1510+000+01+1099005BFF0194
20233057+071+00040020000+1510+000+01+1099005BFF0195
20233058+071+00040020000+1510+000+01+1099005BFF0196
20233059+071+00040020000+1510+000+01+1099005BFF0197
20233060+071+00040020000+1510+000+01+1099005BFF018F
20233061+071+00040020000+1667+000+01+1099005BFE019C
20233062+071+00040020000+1667+000+01+1099005BFE019D
20233063+071+00040020000+1667+000+01+1099005BFE019E
20233000+072+00040020000+1667+000+01+1099005BFE0196
20233001+072+00040020000+1667+000+01+1099005BFE0197
20233002+072+00040020000+1510+000+01+1099005BFF018C
20233103+072+00040020000+1510+000+01+1099005BFF018E
20233104+072+00040020000+1510+000+01+1099005BFF018F
20233105+072+00040020000+1510+000+01+1099005BFF0190
20233106+072+00040020000+1510-001+01+1099005BFF0194
20233107+072+00040020000+1667-001+01+1099005BFE01A1

Thanks
Etienne

 

[dynonsupport]

This is intentional. It lets us do TAS on the EMS when the EMS has an OAT.

It's published in the new user's guide. There's a bit in there that tells you which type is output in that line.

 

[Etienne]

RTFM I guess... :blush:

I'll go do some reading then

Thanks!

 

[Etienne]

Ok, done some reading...

How about doing a similar thing for outputting TAS and IAS?

You have found a unique solution to a problem, we might as well capitalise on it whilst we're changing things

Thanks for the explanation