OFE/QNH/QNE/Flight Levels.... what's appropriate?

[GRUNT -Shrek-]

Please leave a comment!

 

QFE: altimeter zeroes on specified airfield (currently published by ATCs)

QNE: default setting in A-10C 29.92inHG (1013hPa,759.6torr)

QNH: current MSL pressure (altimeter shows field elevation)

 

Since ppl dial in QFE or leave QNE their altitude readings differ:

 

• from aircrafts takeing of from other airfields reading a different elevation
  
• from all AI aircrafts either set to MSL or AGL
  

If QNE is left dialed in (no manipulation on altimeter) furthermore:

 

• altitude is neither field elevation nor zeroizing on that runway
  

 

 

My question is: What would be a propper setting.

 

 

Idea (to keep it simple):

Use QFE in pattern/procedural context (as already published via ATC)

As soon as A/C leaving traffic pattern of airfield: QNH (needs to be published in Briefing in torr/mmHg/inHg), to match up: AI altitudes, common altitude settings, altitude over MSL readout.

 

 

Comments welcome!

Edited April 24, 2012 by GRUNT -=Shrek=-

[Eddie]

QNH should be set in the A-10 for t/o, combat & landing, then switch to QNE at transition altitude (whatever you decide that should be) during the cruise phase of flight.

[effte]

What Eddie said, with the exception of combat occuring above TA (which isn't normally optional or pilot's discretion ;)) when QNE should be set... and of course QFE if that is what ATC gives you.

 

Short answer: The appropriate for the situation and context, as that will provide you separation from other traffic and cumulugranitus.

Edited April 24, 2012 by effte

[Eddie]

.. and of course QFE if that is what ATC gives you.

 

I'll add a caveat to that, which is that QNH must be set for the takeoff roll in order for the IFFCC to be able to calculate weapon delivery parameters correctly.

[Svend_Dellepude]

I'll add a caveat to that, which is that QNH must be set for the takeoff roll in order for the IFFCC to be able to calculate weapon delivery parameters correctly.

 

Is that implemented in DCS A-10?

I mean does it matter to the weapon delivery system?