Hi guys,
I'm a bit stumped again...
Here's the one that got me on last practice exam
You are at 4500ft in cta and wish to climb to 9000ft under the protection of cta.
What is the minimum rate of climb required to stay in cta?
My working was this (under the impression you needed to be above 500ft to be in cta.
6500ft -4500ft = 2000ft
2000ft \ 10nm = 200fpm
I got it wrong.
After reading the book I read something about needing to be 1000ft above the lower limit of cta?
When I returned and tried my working again I got this
10nm @ 120kts = 5mins
2500 / 5 = 500fpm
Obviously I've totally confused my working out process somewhere now I don't know what answers were in that exam so I would like someone to clarify what is the correct method of working out for calculating climb in cta or octa.
Thanks alot guys!
-Dan Parker
Hey Dan
work out should be as follow's:
6500-4500 = 2000 feet
120 kts @ 10 nm = 5 min
2000/5=[u]400 ft/min[/u]
CTA clearnce is 500' above the step
Hey mate,
I see so the method is to work out clearance above first step then distance over time and divide the time by the clearance required.
So if it was 3000' required in 15nm the working would be
120 @ 15nm = 7.5min
3000' / 7.5 = 400fpm
Thanks mate you've been most helpful!
-Dan Parker
Thanks SimSim!
Your feedback is much appreciated. I have the exam on Monday! Have to say for a guy like me its a tough one, I have struggled my way through this one (Nav). It could be partially due to the way I learn but I have some if not most of the information down pat, but its the trick questions (some of them in the BT Cyber exams which is good) also making sure you take the time to read the question, the required outcome and spending quality time on the maths, particularly in time conversion questions, as the time is not metric 😉
Keep up the great posts, I'll post if I learn anything useful during the exam.
Brook
Hey Brook. Good luck tomorrow. I found Nav to be reasonably straight forward and if you read the questions very carefully you'll have no problems. Have alook at my post in this Nav thread for more details.
http://www.bobtait.com.au/forum/navigation/2063-exam-debrief
If you simply try and think about the following broad logic you'll be fine:
What is your required ground state ie: fuel and load etc
What is your required performance ie: fuel burn, ground speed, ROC
What is your track required, track made good, and drift
Be able to calculate x-winfd on the runway from TAF data
What are the positive fix points and methods of confirmation
What are the CTA steps, boundaries, and what are requirements to remain in CTA ie: 500' above the step, but step - 0 is OK for below the step
Be able to calculate the climb, descent rates required to maintain or stay outside CTA.
Know your 1 in 60s backwards and track error corrections.
What is the LMT and UTC ie; Arc to Time conversions at various times of the year - all in ERSA.
Know the Rhumb Line and Great Circle definitions
Know the BOD and EOD definitions and also what happens to these as you fly North or South; and East to West
I am sure there are other things but the main one is - RELAX.
If an old bugger like me can pass all these exams, a bloke like you will have no problems at all.
Just want to say thanks Bob for your awesome books!!
First attempt at CNAV and got 93%, everything was covered in detail yet easy to understand!!
Guys out there studying for Nav, know thy 1:60, VNAV exercises, BOD/EOD in detail and Fuel calcs. Do Bob's practice exams. Some questions are very similar but don't train on knowing the question know the METHOD to working out his practice questions and you wont go wrong in the exam. I managed to study in 2 weeks for this and full time shift work as a rough time frame for others.
Attempting Met in a couple of weeks,
Good luck guys!!
please brief me with some important notes about NAV.Friday next week i will sit and thats the first time for me to sit nav
