What's the best procedure for flying a DME arc?

[Life as a journey]

Hi.

I'm due for an IR renewal in which one of the profiles is to fly a DME arc.

Problem is, I can't remember how!

Anyone got ideas or handy tips?

Thanks in advance.

[PPRuNe Radar]

Although it is talking about jets, this thread may be of some use

DME Arcs (http://www.pprune.org/forums/showthread.php?s=&threadid=168755)

[Life as a journey]

Thanks Radar. I'll be checking that out.

[DFC]

One hint - use the DME groundspeed readout to keep you on or slow the closure rate with the required arc - when you fly a circle round the station, it's groundspeed readout will be 0.

regards,

DFC

[keithl]

That threads mostly about turn in ranges. The actual technique most people prefer for manual arc flying is to fly a series of chords across the arc. How you do that depends on the instrumentation, but RANT 2000 is a good PC program that allows you to customise your instrumentation and try out the techniques.

[CosmosSchwartz]

Set your RMI to the relevant NDB or VOR. At the turning point (usually two miles before the arc) turn until the RMI is showing the beacon as abeam. Allow the needle to drop 10 degrees behind then turn in to raise the needle 10 or 20 degrees above the abeam. Allow the needle to drop 10 degrees below abeam and repeat until reaching the lead radial. Don't forget to take wind into account.

Or as DFC says, just use the DME groundspeed. Allow the groundspeed to drop to zero. When it increases to 7, turn 10 degrees. G/s to 0 and repeat. For your average piston single or twin this will keep you to within 0.1d on the arc!

[Life as a journey]

Thanks Team , it's all coming back to me now.

2 miles inbound to the arc itself at 200 knots clean (767), start the turn to lay the needle(s) abeam.

Allow the needle to drop 10 degrees, then adjust heading to place the needle 10 degrees 'above' abeam.

Configure to flaps 5, 160 knots, and turn onto final with 1.6 miles to run to the final course.

At a 10 mile intercept, that should be around 10 degrees from the inbound using the 1 in 60 rule.

Thanks again.

[Frank Poncherello]

Let the Autopilot follow the green line!?!?


:)

[CosmosSchwartz]

There's always an airbus pilot waiting to come along and spoil it!

;)

[ifleeplanes]

Or a boeing pilot...;)

[CosmosSchwartz]

Although in this case it was an airbus pilot.

[piontyendforward]

:cool: I have found that LNAV and the magenta line flys better than I can on the DME arc!

[greybeard]

Careful of flying the arc on the auto-pilot in Nav as it MAY use a constant angle of bank of about 10deg.

Roll out on final and your A/C is happy to fly wings level, BUT your head MAY have a residual angle of bank and cause vertigo or difficulty in flying straight.

Worse at night, did it to prove a piont at VRMM which is REALLY black.

????? Anyone have a similar problem???


C YA

:ok:

[Belowclouds]

In case there's no arc in database it's much easier to create it artificially. Just choose several points on arc randomly and assign them as P/B/D. Woun't take much time because the "D" for all them is the same. Have a rest in managed mode than.

[Dream Land]

Life as a Journey's suggestion using 10% of your speed will help you on arcs and all other intercepts, jet, prop, whatever.


Dream Land:cool: