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    Default Navex details

    The crash of Oxford LX745 on a nightflying cross country exercise: Calveley-Wrexham-Lichfield-Calveley occurred about 50km northeast of the intended final return destination. Can someone describe for me what is involved in a "navex" and what likely went wrong here?
    Last edited by dfuller52; 25th January 2009 at 15:12. Reason: added words
    David

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    Can we have a date? Can look at various Met parameters to see if they might have had any bearing on this problem.
    Rgds
    Peter Davies
    Meteorology is a science; good meteorology is an art!
    We might not know - but we might know who does!

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    12 Mar 1944 at about 23:30 hours after what might have been a two-hour flight. Crash site is on Shining Tor, north of the Cat and Fiddle.
    David

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    Dave,
    The Met Section think that it is unlikely that the wind-flow on that night contributed significantly to the a/c being somewhat over-northeastly!!!! It was full moon (cloud cover not known) but, maybe, the Nav was concentrating too much on his charts and not enough "look-see" outside!!
    A Navex was a Navigation Exercise. A route was chosen (short, or long) and the a/c had to complete the course using all the aids (or none of them!!) available at the time. Then things got harder! Not only did you have to complete the prescribed course, but in later years, you had to be over the various turning points at the right time.
    This sort of thing usually sorted the men from the boys - i.e. the real Navigators from those who merely saw themselves as Directional Consultants (as we would say nowadays).
    HTH
    Peter Davies
    Meteorology is a science; good meteorology is an art!
    We might not know - but we might know who does!

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    Thanks Peter, this isn't looking good for my subject, who would have been doing the nav on this one. I'm thinking he got his calculations wrong and it took them near mountains when there shouldn't have been any.

    When you plot their course on a map, the route they took is a mirror image of the homeward-bound leg, which suggests to me that it was a calculation error on the final heading.

    They did try to contact the stations on there way around the course but something obviously went wrong on the last leg.

    Thanks to the Met team. I have another one for you - involving a snowstorm - which I will put up on another thread.
    Last edited by dfuller52; 25th January 2009 at 17:44. Reason: spelling
    David

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    One thing that struck me when I plotted the route and then the bearings from both Calveley and Lichfield to the crash site was that the bearing from Calveley to Shining Tor is almost a direct reciprocal of the Calveley - Wrexham leg.

    What we would need would be a transcirpt of the Court of Inquiry, which we all know AHB probably have but would never give us. That would give a lot more detail about the W/T transmissions that were recorded.

    As the crew consisted of a Pilot (Inst), Pilot (u/t) and Staff W/Op it would have been the u/t pilot's job to both fly and navigate with the instructor providing normal instructional guidance and the W/Op maintaining (or trying to maintain) contact with base and other local stations the radio was equipped to communicate with.

    Here is a copy of the text from the back of the 1180, the original is in the hand writing of a number of people and is not that clear.

    "A/c on short W/T night x-country

    a/c missing. Still searching. Invest – F412 Pilot flew south of track thru wind change got into cloud, turned on E.T.A. thought above base, broke cloud, flew into hill.

    F412 Pilot’s error in descending thru cloud when he did not know his position. Failed to use “Darky”.

    F412 u/c retracted when a/c hit hill
    F412 “Darky” appears not to have been used. No calls heard altho’ watch maintained.
    412 Wind speed had increased considerably once pilot took off & the pilot [found] from a bearing he was S of track allowed for wind [direction] change.
    412 Hit high ground when descending thru cloud.

    F412 Co pilot’s error in breaking clouf without knowing his posn & failing to use “Darky”. Lack of I.F. considered to have no bearing on accident. All W/T personnel to be checked for efficiency before flying. A.O.C. agrees althought says “don’t agrre lack of I.F. practice had no bearing”. Pilots must do 2hr I.F. & 2hr Link every month. A.O.C. in C. concurs."

    I can understand with the wind being NE that night the aircraft ending up south of course but still the massive NE deviation is very odd.
    Alan Clark

    Peak District Air Accident Research

    http://www.peakdistrictaircrashes.co.uk/

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