Okay, I've done this before but how did it go again? You're inbound Moscow and you're given the local QFE and want to convert it to QNH.So do I take the Altitude difference divided by 27 feet and add it to the QFE or what?I know you might be given the local QNH, however I'd like to know how it could be done.Thanks:ugh:
Spitoon
20th Sep 2006, 16:47
Yup, take the ad elevation in feet div by 30 (or 27 if you prefer) and that gives you a number to add to the QFE in hPa to give a pretty good approximation of the QNH. Look out for different units of measurements - obvious but important!
mustafagander
21st Sep 2006, 04:07
AFAIK Jepp charts give the field elevation in Hpa on the approach chart.
Itswindyout
21st Sep 2006, 05:15
The 27ft per Hpa, or 30 ft is a perfect answer.
Take the published airport elevation, and divide by 30. This gives a very close Hps to be added to the QFE. The Russian system normally provides a QFE. This gives the QNH.
There are several discussions that suggest working in GFE or in QNH when working in Ruiisa.
Most FMS display the runway evelvation, if feet; so will show 690ft for example on 24 at VNO.
Many operators deduct 690 ft, or use the Jepp published plate QFE value, and input in the FMS, for all values below the Transition, either 1500mt or 1800mt.
I would strongly recomend creation of a laminated data sheet, to fit on the control wheel chart data sheet, with BIG numbers.
This data sheet showing the relevent FL in feet to FL in meters. and show 1800m, 1500, 1200, 900m, 600m, 500m, 400m,300m,200m.
Have two copies, one either seat.
These numbers can be obtained from the "tables and codes" off your jepps.
Many new FMS have a conversion page, for FL Mts; and have a page for QFE conversion of Hps, Mtrs and Ft, for QFE and QNH.
As a back up also note the Mm altimeter setting for QFE, and verify. It is not unknown for the Hps numbers to be transposed, by non first language controllers working in English.
Lastly all I can say is take your time, and verify ALL conversions.
Have a great Moscow experience.
PM if more info needed, or even a hand holder.
Windy
semper fi
21st Sep 2006, 08:30
errr, not everybody flies with control columns right?:confused:
Itswindyout
21st Sep 2006, 08:38
Try velcro to your knee board.