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AFSS or air traffic control tower (ATCT) either in person,
by telephone (1-800-WX-BRIEF), by computer (using the
direct user access terminal system (DUATS)), or by radio
if no other means are available. Pilots should file IFR flight
plans at least 30 minutes prior to estimated time of departure
to preclude possible delay in receiving a departure clearance
from ATC. The AIM provides guidance for completing
and filing FAA Form 7233-1, Flight Plan. These forms are
available at flight service stations (FSSs), and are generally
found in flight planning rooms at airport terminal buildings.
[Figure 10-1]
Filing in Flight
IFR flight plans may be filed from the air under various
conditions, including:
1. A flight outside controlled airspace before proceeding
into IFR conditions in controlled airspace.
2. A VFR flight expecting IFR weather conditions en
route in controlled airspace.
In either of these situations, the flight plan may be filed with
the nearest AFSS or directly with the ARTCC. A pilot who
files with the AFSS submits the information normally entered
during preflight filing, except for “point of departure,”
together with present position and altitude. AFSS then
relays this information to the ARTCC. The ARTCC will
then clear the pilot from present position or from a specified
navigation fix.
10-3
Figure 10-1. Flight Plan Form.
A pilot who files directly with the ARTCC reports present
position and altitude, and submits only the flight plan
information normally relayed from the AFSS to the ARTCC.
Be aware that traffic saturation frequently prevents ARTCC
personnel from accepting flight plans by radio. In such
cases, a pilot is advised to contact the nearest AFSS to file
the flight plan.
Cancelling IFR Flight Plans
An IFR flight plan may be cancelled any time a pilot is
operating in VFR conditions outside Class A airspace by
stating “cancel my IFR flight plan” to the controller or air-toground
station. After cancelling an IFR flight plan, the pilot
should change to the appropriate air-to-ground frequency,
transponder code as directed, and VFR altitude/flight level.
ATC separation and information services (including radar
services, where applicable) are discontinued when an IFR
flight plan is cancelled. If VFR radar advisory service is
desired, a pilot must specifically request it. Be aware that
other procedures may apply when cancelling an IFR flight
plan within areas such as Class C or Class B airspace.
When operating on an IFR flight plan to an airport with
an operating control tower, a flight plan is cancelled
automatically upon landing. If operating on an IFR flight
plan to an airport without an operating control tower, the
pilot is responsible for cancelling the flight plan. This can
be done by telephone after landing if there is no operating
FSS or other means of direct communications with ATC.
When there is no FSS or air-to-ground communications are
not possible below a certain altitude, a pilot may cancel an
IFR flight plan while still airborne and able to communicate
with ATC by radio. If using this procedure, be certain the
remainder of the flight can be conducted under VFR. It is
essential that IFR flight plans be cancelled expeditiously. This
allows other IFR traffic to utilize the airspace.
Clearances
An ATC clearance allows an aircraft to proceed under
specified traffic conditions within controlled airspace for the
purpose of providing separation between known aircraft.
Examples
A flight filed for a short distance at a relatively low altitude
in an area of low traffic density might receive a clearance
as follows:
“Cessna 1230 Alpha, cleared to Doeville airport direct,
cruise 5,000.”
10-4
The term “cruise” in this clearance means a pilot is authorized
to fly at any altitude from the minimum IFR altitude up to and
including 5,000 feet, and may level off at any altitude within
this block of airspace. A climb or descent within the block may
be made at the pilot’s discretion. However, once a pilot reports
leaving an altitude within the block, the pilot may not return to
that altitude without further ATC clearance.
When ATC issues a cruise clearance in conjunction with an
unpublished route, an appropriate crossing altitude will be
specified to ensure terrain clearance until the aircraft reaches a
fix, point, or route where the altitude information is available.
The crossing altitude ensures IFR obstruction clearance to
the point at which the aircraft enters a segment of a published
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