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-   Tech Log (https://www.pprune.org/tech-log-15/)
-   -   what is the accuracy reqd in DME arc (https://www.pprune.org/tech-log/455255-what-accuracy-reqd-dme-arc.html)

aterpster 30th Jun 2011 13:53
bubbers44:

My trusty 727 did great arcs at 250 knots using heading select. I didn't know I just had to find the LNAV and VNAV buttons. Actually most of the time I rolled into about an 8 degree bank so the bank never changed.
You must have had a lot better autopilot than we had on our 727s. Heading select for us would command a 25 degree bank for any significant heading change.

Having said that anyone proficient in a 727 should be able to fly a DME arc with the autopilot and FD turned off.

Checkboard 30th Jun 2011 16:19
Well. as we fly all DME Arc in LNAV I would expect to see the appropriate RNP for the phase of flight, normally 0.3 for approach. While raw data monitoring is normal, no one in their right mind flys a commercial jet on a DME arc in HDG SEL..why would you? As for speed, VNAV will give a sensible speed base on the next limiting waypoint,...
That's right. It should be against the law to fly with out triple IRS, FMC, LNAV & VNAV - anything else is just dangerous. :hmm:

Children of the magenta line. :rolleyes:


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