91.405 IFR alternate aerodrome requirement
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(a) A pilot-in-command of an aircraft operating under IFR must list at
least 1 alternate aerodrome in the flight plan unless--
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(1) the aerodrome of intended landing has a standard instrument
approach procedure published in the applicable AIP; and
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(2) at the time of submitting the flight plan, the meteorological
forecasts indicate, for at least 1 hour before and 1 hour after the
estimated time of arrival at the aerodrome of intended landing,
that--
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(i) the ceiling at the aerodrome will be at least 1000 feet
above the minimum published in the applicable AIP for
the instrument procedure likely to be used; and
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(ii) visibility will be at least 5 km, or 2 km more than the
minimum published in the applicable AIP, whichever is
the greater.
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(b) A pilot-in-command of an aircraft must not list any aerodrome as an
alternate on the IFR flight plan under paragraph (a) unless the
meteorological forecasts at the time of submitting the flight plan indicate
that, at the estimated time of arrival at the alternate aerodrome, the ceiling
and visibility at that aerodrome will be at or above the following
meteorological minima--
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(1) if an instrument approach procedure with alternate minima has
been published in the applicable AIP for the aerodrome, the
specified alternate aerodrome minima for that instrument
approach procedure; or
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(2) for a precision approach procedure, a ceiling of 600 feet, or 200
feet above DA/DH, whichever is the higher, and a visibility of
3000 metres, or 1000 metres more than the prescribed minimum,
whichever is the greater; or
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(3) for a non-precision approach procedure, a ceiling of 800 feet, or
200 feet above MDA/MDH, whichever is the higher, and a
visibility of 4000 metres, or 1500 metres more than the
prescribed minimum, whichever is the greater; or
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(4) if an instrument approach procedure has not been published in
the applicable AIP for the alternate aerodrome, the ceiling and
visibility minima prescribed under Part 91 Subpart D for an air
operation performed under VFR for descent below the minimum
altitude for IFR flight prescribed under rule 91.423.
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(c) A pilot-in-command of an aircraft must not list any aerodrome as an
alternate aerodrome in the IFR flight plan under paragraph (a) unless that
alternate aerodrome is equipped with a secondary electric power supply
for--
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(1) the ground based electronic navigation aids necessary for the
instrument approach procedure to be used; and
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(2) aerodrome lighting for night operations.