PPRuNe Forums - What is the allowable margin of error for a DME arc?

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RTN11

22nd Sep 2014 20:04

What is the allowable margin of error for a DME arc?

What is the allowable margin of error for a DME arc?

I thought it was +/- 0.5nm, but people I've been flying with lately (who are more senior than me) think it's +/- 1.0nm, and we're all struggling to find a reference.

Cough

22nd Sep 2014 20:41

CAA standards doc for IR's

Check appendix 3

B737900er

22nd Sep 2014 20:44

Depends is your following TERPS or Pans-ops.
In the UK, the CAA guidance document for candidates for the initial instrument rating test states +- 1nm for DME arcs.

OhNoCB

22nd Sep 2014 21:10

1nm for IRT anyway as said above. Have heard this was simply due to some DME's only doing whole miles, but I have never seen one myself so don't know.

FWIW I think 1nm is a massive tolerance, I am no hotshot by any means but either I have a knack for DME arcs or it's a generous allowance, because I used to be disappointed to not keep it within +-0.1 when doing my IR.

Centaurus

25th Sep 2014 11:49

In Australia the DME arc tolerance is plus or minus 2 DME and has been ever since the first DME was installed in this country. It is a common sense figure thank goodness.

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