PROCEDURES ASSIGNED BY ATC
ATC can assign SIDs or radar vectors as necessary for
traffic management and convenience. You can also
request a SID in your initial flight plan, or from ATC.
To fly a SID, you must receive approval to do so in a
clearance. In order to accept a clearance that includes a
SID, you must have at least a textual description of the
SID in your possession at the time of departure. It is
your responsibility as pilot in command to accept or
reject the issuance of a SID by ATC. You must accept or
reject the clearance based on:
- The ability to comply with the required performance.
- Possession of at least the textual description of the SID.
- Personal understanding of the SID in its entirety.
When you accept a clearance to depart using a SID or
radar vectors, ATC is responsible for traffic separation.
ATC is also responsible for obstacle clearance. When
departing with a SID, ATC expects you to fly the procedure
as charted because the procedure design considers
obstacle clearance. It is also expected that you will remain
vigilant in scanning for traffic when departing in visual
conditions. Furthermore, it is your responsibility to notify
ATC if your clearance would endanger your safety or the
safety of others.
PROCEDURES NOT ASSIGNED BY ATC
Obstacle departure procedures are not assigned by ATC
unless absolutely necessary to achieve aircraft separation.
It is the pilotís responsibility to determine if there is an
ODP published for that airport. If a Part 91 pilot is not
given a clearance containing an ODP, SID, or radar
vectors and an ODP exists, compliance with such a
procedure is the pilotís choice. If he/she chooses not to
use the ODP, the pilot must be operating under visual
meteorological conditions (VMC), which permits the
avoidance of obstacles during the departure.
DEPARTURES FROM TOWER-CONTROLLED AIRPORTS
Departing from a tower-controlled airport is relatively
simple in comparison to departing from an airport that
isnít tower controlled. Normally you request your IFR
clearance through ground control or clearance delivery.
Communication frequencies for the various controllers
are listed on departure, approach, and airport charts as
well as the A/FD. At some airports, you may have the
option of receiving a pre-taxi clearance. This program
allows you to call ground control or clearance delivery
no more than ten minutes prior to beginning taxi operations
and receive your IFR clearance. A pre-departure
clearance (PDC) program that allows pilots to receive a
clearance via data link from a dispatcher is available for
Part 121 and 135 operators. A clearance is given to the dispatcher who in turn relays it to the crew, enabling the
crew to bypass communication with clearance delivery,
thus reducing frequency congestion. Once you have
received your clearance, it is your responsibility to comply
with the instructions as given and notify ATC if you
are unable to comply with the clearance. If you do not
understand the clearance, or if you think that you have
missed a portion of the clearance, contact ATC immediately