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visibility minimums are greater than 3 miles (Bishop,
California; South Lake Tahoe, California; and
Aspen−Pitkin Co/Sardy Field, Colorado). In the case
of these airports, it is possible for a pilot to elect, on
the basis of forecasts, not to carry sufficient fuel to get
to an alternate when the ceiling and/or visibility is
actually lower than that necessary to complete the
approach.
6.2.2A small number of other airports in mountainous
terrain have MDAs which are slightly (100 to
300feet) below 2,000 feet AGL. In situations where
there is an option as to whether to plan for an
alternate, pilots should bear in mind that just a slight
worsening of the weather conditions from those
forecast could place the airport below the published
IFR landing minimums.
6.2.3An IFR flight to an airport which requires
special equipment; i.e., DME, glide slope, etc., in
order to make the available approaches to the lowest
minimums. Pilots should be aware that all other
minimums on the approach charts may require
weather conditions better than those specified in
14CFR Section91.167(b). An inflight equipment
malfunction could result in the inability to comply
with the published approach procedures or, again, in
the position of having the airport below the published
IFR landing minimums for all remaining instrument
approach alternatives.
7. Composite Flight Plan (VFR/IFR Flights)
7.1Flight plans which specify VFR operation for
one portion of a flight, and IFR for another portion,
will be accepted by the FSS at the point of departure.
If VFR flight is conducted for the first portion of the
flight, the pilot should report his/her departure time to
the FSS with which he/she filed his/her VFR/IFR
flight plan; and, subsequently, close the VFR portion
and request ATC clearance from the FSS nearest the
point at which change from VFR to IFR is proposed.
Regardless of the type facility you are communicating
with (FSS, center, or tower), it is the pilot’s
responsibility to request that facility to CLOSE VFR
FLIGHT PLAN." The pilot must remain in VFR
weather conditions until operating in accordance with
the IFR clearance.
7.2When a flight plan indicates IFR for the first
portion of flight and VFR for the latter portion, the
pilot will normally be cleared to the point at which the
change is proposed. Once the pilot has reported over
the clearance limit and does not desire further IFR
clearance, he/she should advise air traffic control to
cancel the IFR portion of his/her flight plan. Then,
he/she should contact the nearest FSS to activate the
VFR portion of his/her flight plan. If the pilot desires
to continue his/her IFR flight plan beyond the
clearance limit, he/she should contact air traffic
control at least five minutes prior to the clearance
limit and request further IFR clearance. If the
requested clearance is not received prior to reaching
the clearance limit fix, the pilot will be expected to
establish himself/herself in a standard holding pattern
on the radial/course to the fix unless a holding pattern
for the clearance limit fix is depicted on a U.S.
Government or commercially produced (meeting
FAA requirements) Low/High Altitude En Route,
Area, or STAR chart. In this case the pilot will hold
according to the depicted pattern.
ENR 1.10−14 AIP
15 MAR 07 United States of America
Nineteenth Edition Federal Aviation Administration
8. Initiating a Change to Flight Plans on File
8.1Changes to proposed flight plans should be
initiated through the FSS with which the flight plan
was originally filed. If this is not possible, initiate
changes through the nearest FSS or ATC facility. All
changes should be initiated at least 30 minutes prior
to departure to insure that the change can be effected
prior to the ATC clearance delivery.
9. Change in Proposed Departure Time
9.1To prevent computer saturation in the en route
environment, parameters have been established to
delete proposed departure flight plans which have not
been activated. Most centers have this parameter set
so as to delete these flight plans a minimum of 1 hour
after the proposed departure time. To ensure that a
flight plan remains active, pilots whose actual
departure time will be delayed 1 hour or more beyond
their filed departure time, are requested to notify ATC
of their departure time.
9.2Due to traffic saturation, control personnel
frequently will be unable to accept these revisions via
radio. It is recommended that you forward these
revisions to the nearest FSS.
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