help needed with nav exam
hi everyone
im currently studying for the nav exam can you tell me if this is the correct way to fill these parts of the flight log? first calculate MSA if highest ground is terrain round up to next hundred add 1300? or if its a strucure round up to nxt hundred add 1000? hdg= true track of 085 plus var ie 5w = 090 west is best prompt! if calculating hdg T do i take allowance for the W/V and Magnetic var or just the wind? all my calculations seem to be off by a few degrees!! also when working out the distance of a line ive drawn from airfield to airfield do i need to start from the edge of the circle or in the middle as even this measurement can be out by half a mile!! im pretty sure in the real exam this would be considered a fail am i right? could it be that the book im doing the exams from is quite old now (jeremy pratt questions and answers 2003 edition? the chart i use is a a 1.500000 current vfr |
first calculate MSA if highest ground is terrain round up to next hundred add 1300? or if its a strucure round up to nxt hundred add 1000? Another method is to simply look at the sector highest obstacle elevation or sector MSA that's printed on the chart for every 1/2 degree of latitude/longitude. But manufacturers are not consistent in this respect: The ICAO chart for the UK uses the highest obstacle elevation, so you need to add 1000' to get the sector MSA, but the Jeppesen VFR charts use MSA. hdg= true track of 085 plus var ie 5w = 090 west is best prompt! if calculating hdg T do i take allowance for the W/V and Magnetic var or just the wind? all my calculations seem to be off by a few degrees!! Give us a full example, with wind and everything, and we'll be able to tell you where you're going wrong. also when working out the distance of a line ive drawn from airfield to airfield do i need to start from the edge of the circle or in the middle as even this measurement can be out by half a mile!! In any case, 1/2 nm is only about 15 seconds of flight. Not enough to care. |
nav questions
I understand MSA .
Below is a typical exam question i attempted a few days ago taken from the Jeremy Pratt questions and answers 2003 edition if that helps!! It is intended to fly a VFR cross country route from Hucknall airfield(N5300.85 W00113.10) to Manchester airport (N5321.22 W00216.50) via a turning point at Hawarden airfield (N5310.68 W00258.67), complete the attached flight log. Hucknall to Hawarden W/V is stated as 260/15 Tas 85kts Var 5W I dont really understand where they get 5W from but thats what it says in the book. My answers are as follows, MSA 3000 TRK 285 DRIFT 4 HDG T 281 HDG 290 GS 69KTS DIST NM 64.5 TIME 45.5MINS Hawarden to Manchester Stated W/V 280/20 Tas 90kts my answers MSA 2000 TRK T 067 DRIFT 7 HDG T 060 HDG M 072 GS 106KTS DIST NM 27.5 TIME 18.5 One of the errors i made was to base the time on airspeed not groundspeed so this i why the times dont add up i hope! also do i need to apply magnetic variation to hdg true? to make that correct. sorry if this seems tiresome but i cant rest until ive got it into my head!!:ugh::ugh::ok:. |
MEFs as printed on CAA 1/2 mill charts are based on information available concerning the highest known feature in the associated area, including terrain and obstacles and allowing for unknown features.
There is no need to add the mythical 300 ft as that is allowed for - if there are higher obstacles already known about, then they will have been included in the MEF. If not, then the 300 ft will already have been added. Regarding your question about deg T or deg M, the simplest option is to use deg T for everything, then finally apply variation (and deviation, if necessary) in order to obtain the value you will use on your aeroplane's magnetic compass and DI. |
Hucknall to Hawarden W/V is stated as 260/15 Tas 85kts Var 5W I dont really understand where they get 5W from but thats what it says in the book. But we'll assume the given 5 degrees west for the rest of the calculation. My answers are as follows, MSA 3000 TRK 285 DRIFT 4 HDG T 281 HDG 290 GS 69KTS DIST NM 64.5 TIME 45.5MINS DRIFT 4 west (from the flight computer) TRUE HEADING 281 (=285 - 4) MAG HEADING 286 (=281 + 5) GS 72 KTS (from the flight computer) DIST 64.5 TIME 53.7 minutes If you assume that 279 is correct, the numbers are very slightly different: DRIFT 3 west TH 276 MH 281 GS 71 KTS DIST 64.5 TIME 54.5 minutes Hawarden to Manchester Stated W/V 280/20 Tas 90kts my answers MSA 2000 TRK T 067 DRIFT 7 HDG T 060 HDG M 072 GS 106KTS DIST NM 27.5 TIME 18.5 So... Looks like you need to re-read the unit once more, particularly how magnetic variation influences your true heading. You did that wrong twice. And you need to re-read the notes that came with your flight computer, because you are making some basic calculation errors in your GS/DIST/TIME calculations. |
MEFs as printed on CAA 1/2 mill charts are based on information available concerning the highest known feature in the associated area, including terrain and obstacles and allowing for unknown features. There is no need to add the mythical 300 ft as that is allowed for - if there are higher obstacles already known about, then they will have been included in the MEF. If not, then the 300 ft will already have been added. Nevertheless, I agree with you. It's much easier to use the sector MEF figures and add 1000' to get the MSA if you're using the 1/2 mill CAA charts. And if you use the Jeppesen ones, the sector MSA is actually already printed on the map. |
nav exam
thanks for your help guys really appriecate that
i will use the MEF figures from the map from now on seems way more simpler! ive booked an hours groundschool at my local field this week so hopefully any furthewr problems or errors can be put right!!! once again thanks :ok::ok::ok: |
Nevertheless, I agree with you. It's much easier to use the sector MEF figures and add 1000' to get the MSA if you're using the 1/2 mill CAA charts. But of course such real life discussions have only a little to do with guessing which is the right answer in a multiple choice exam ... |
Nav Exam
As a matter of interest does anyone know if you are given a complete map for the Nav Ground Exam or just a relevant a portion of it with the symbols & legend cut off? It would save a lot of memorising if complete, as you always get one you are not sure of.
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The last I saw for the UK was a "portion" for the nav and a full southern England chart for the IMC.
=^..^= |
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