HPL- vision

Discussion in 'Pilot Training' started by Drecular, Nov 27, 2018.

Tags:
  1. Drecular

    Drecular Filing Flight Plan

    Joined:
    Nov 15, 2018
    Messages:
    21
    Display Name:

    Display name:
    Drecula
    I couldn’t recall how to calculate this. Can someone jog my memory.
    83B67CCC-853F-463C-B6E8-6CA02C08DC0E.jpeg
     
  2. N659HB

    N659HB Pattern Altitude

    Joined:
    Jul 20, 2013
    Messages:
    2,311
    Location:
    Check your six
    Display Name:

    Display name:
    Pops
    If I were attempting to solve it, I’d first (roughly) convert km to nautical miles to determine separation at “maximum visual range,” since the closure rate is given in knots. 4 km is roughly 2 nautical miles. Then solve for closure rate. 280 knots is roughly 4.7 nautical miles per minute. What’s the closest correct answer?

    BTW, where did you find this question?
     
    Drecular likes this.
  3. AggieMike88

    AggieMike88 Touchdown! Greaser!

    Joined:
    Jan 13, 2010
    Messages:
    15,737
    Location:
    Denton, TX
    Display Name:

    Display name:
    Now offering reverse discounts.
    I am going to guess Canada because of the use of metric system and worded in English..

    Two other clues that this is not a USA FAA exam question is there are four possible answers instead of three, and there are small case answer choices (a., b., c., d.) instead of upper case (A., B., C.)
     
  4. N659HB

    N659HB Pattern Altitude

    Joined:
    Jul 20, 2013
    Messages:
    2,311
    Location:
    Check your six
    Display Name:

    Display name:
    Pops
    Do the Canuks allow 4 km VFR? Lol
     
  5. pd8

    pd8 Filing Flight Plan

    Joined:
    Aug 1, 2018
    Messages:
    12
    Location:
    Boyds, Maryland
    Display Name:

    Display name:
    half90Vr
    1 nautical mile is about 1.85 km. So, 4 (km)/1.85 (km/NM)= 2.16 NM. They are about 2.16 NM apart at the initial visual contact.
    Knots is NM/h. Thus, they will collide in 2.16 (NM) / 280 (NM/h) hours, which is 0.0077 hours. Therefore, 0.0077*3600 = 27.8 seconds.
     
    Drecular likes this.
  6. Drecular

    Drecular Filing Flight Plan

    Joined:
    Nov 15, 2018
    Messages:
    21
    Display Name:

    Display name:
    Drecula
    Thats correct. The answer is Alpha.
     
  7. Drecular

    Drecular Filing Flight Plan

    Joined:
    Nov 15, 2018
    Messages:
    21
    Display Name:

    Display name:
    Drecula
    It’s a question in the Oxford CBT for PPL.
     
    Last edited: Nov 28, 2018
  8. Drecular

    Drecular Filing Flight Plan

    Joined:
    Nov 15, 2018
    Messages:
    21
    Display Name:

    Display name:
    Drecula
    Not Canada. UK
     
  9. PaulS

    PaulS Final Approach

    Joined:
    May 29, 2007
    Messages:
    7,393
    Display Name:

    Display name:
    PaulS
    TROLL...….. just getting that out of the way, lol.

    That is a PIA question, you have two different unit of measures used, so you have to convert one to the other. I'll convert km to nm, using the googles, 4km = 2.16nm, then I would divide 2.16 nm by 280 nm/hour which would equal, 0.008 which is actually 0.008 hours. Now you need to convert that to seconds, so knowing there are 3,600 seconds/1 hour I would multiply 0.008 hours times 3600 sec/hour which equals 29 seconds. So A is correct.... (I rounded some numbers)

    Or I'm sure someone sells a whiz wheel that would figure it out for you.
     
    Drecular likes this.
  10. Matthew

    Matthew Touchdown! Greaser!

    Joined:
    Apr 18, 2005
    Messages:
    14,294
    Location:
    kojc, kixd, k34
    Display Name:

    Display name:
    Matthew
    I think I need an E6C.

    By the time I figure that one out, traffic will be "no factor".
     
  11. N659HB

    N659HB Pattern Altitude

    Joined:
    Jul 20, 2013
    Messages:
    2,311
    Location:
    Check your six
    Display Name:

    Display name:
    Pops
    So, is 4 km flight visibility legal VFR in the UK?
     
  12. Drecular

    Drecular Filing Flight Plan

    Joined:
    Nov 15, 2018
    Messages:
    21
    Display Name:

    Display name:
    Drecula
    I’m not from UK. But as far as I know it’s 5km over there.
    This CBT is a pretty old one.
    [​IMG]
     
    Last edited: Nov 29, 2018