Hi everyone,

I just failed performance with 62% and I need a bit of guidance. I know my Echo stuff - there were no KDRs on Echo - but the errors I made were small mistakes with big consequences. I got two PNRs wrong, one ETI to ETP and a bunch of others. So if someone could refresh my memory on both time and distance to the PNR and ETP, that would be immensely helpful.

One of the stupidest errors I made was the ERSA: I chose the wrong answer for Runway width. I used the figure next to "RWY WID". Is this the right one?

Another one I got wrong was the relationship between the runway distances. How do you work out the distance of the TORA when there is a clearway and a stop way? I know, it seems like a really stupid question but it was one of the ones I got wrong.

Rebooked for next Friday and it would be great if I could walk out with 70. I don't care about getting 95 or 100, after the horrible few days flying I've had (I have a PPL but I suddenly can't navigate at all!) doing an exam next week and passing would do a lot in getting me out of the rut I'm in.

We have just released a NAVIGATION WORK BOOK for PPL and CPL. Even though you want help with ETP and PNR calculations for CPL Performance, this work book contains dozens of examples and drill exercises with answers on ETP and PNR calculations. For $20.00 you can get access to the e-text version of this book and you will find the drill exercises on Page 22 to Page 25. If it's drill you want, this should be a great help. Go to our web page www.bobtait.com.au/forum/important-news/...for-ppl-and-cpl#7669

Good luck.

Some thoughts in addition to Bob's comments -

(a) I used the figure next to "RWY WID". Sounds about right .. sure the question didn't ask for strip rather than runway width ?

(b) How do you work out the distance of the TORA See MOS 139 5.2.2 at www.legislation.gov.au/Details/F2016C002...lume_1#_Toc442952747 for the Australian story.

Things can get a bit convoluted with RESA sometimes but that is an exception. Normally, a pilot shouldn't have to do any sums .. AIP ERSA provides the figures from aerodrome survey information.

As an aside, TORA isn't all that relevant to light aircraft .. it is, though, very relevant to heavies where takeoff calculations include looking at both takeoff distance and takeoff run required data. One caveat, though .. for a far intersection departure by a lightie from a runway with a significant clearway, there is a slight possibility that the remaining TORA vice TODA might put the aircraft in a ground/air distance problem situation. However, given the modest surface requirements for the typical lightie, this is probably more of an academic rather than a safety consideration.