deck lights mounted horizontally, one
either side of the stack, at the optimum
aircraft hover height (which aligns to
the fourth vertical light, thus resulting
in three lights above this position and
Light output from each of the vertical
lights is designed such that it can only be
seen when level with or above the centre
line of the light; it cannot be seen from
below this level. Thus if the unit is viewed
at the optimum hover height, then a ‘T’
shape, consisting of the vertical stack of
lights horizontal deck lights, will be seen.
Moving above this position will result in
more vertical lights being observed and a
decrease in height will have the opposite A demonstration ‘Bedford Array’ rig was trialled aboard HMS Illustrious in November 2008.
effect, although the horizontal reference
will still be visible. The spacing of the
lights will also give a clear indication as intended to be used once the aircraft intended to complement the information
to the rate of ascent or descent as more is over the deck and in the hover phase obtained from GLIS and between them
lights are illuminated or extinguished, of the flight, it is anticipated that pilots will provide a complete visual approach
and the rate at which this occurs. will acquire the HIHAT at anything up aid for a vertical recovery.
Whilst the HIHAT is primarily to 0.5nm from the ship. The system is Although the original assumption