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the waypoints sequence, reasonableness of track
angles and distances, any altitude or speed
constraints, and identification of fly-by or fly-over
waypoints. A procedure shall not be used if validity
of the navigation database is in doubt.
AIM 2/14/08
5-1-20 Preflight
e. Prior to commencing takeoff, the flight crew
must verify that the RNAV system is operating
correctly and the correct airport and runway data have
been loaded.
2/14/08 AIM
Departure Procedures 5-2-1
Section 2. Departure Procedures
5-2-1. Pre‐taxi Clearance Procedures
a. Certain airports have established pre‐taxi
clearance programs whereby pilots of departing
instrument flight rules (IFR) aircraft may elect to
receive their IFR clearances before they start taxiing
for takeoff. The following provisions are included in
such procedures:
1. Pilot participation is not mandatory.
2. Participating pilots call clearance delivery or
ground control not more than 10 minutes before
proposed taxi time.
3. IFR clearance (or delay information, if
clearance cannot be obtained) is issued at the time of
this initial call‐up.
4. When the IFR clearance is received on
clearance delivery frequency, pilots call ground
control when ready to taxi.
5. Normally, pilots need not inform ground
control that they have received IFR clearance on
clearance delivery frequency. Certain locations may,
however, require that the pilot inform ground control
of a portion of the routing or that the IFR clearance
has been received.
6. If a pilot cannot establish contact on clearance
delivery frequency or has not received an IFR
clearance before ready to taxi, the pilot should contact
ground control and inform the controller accordingly.
b. Locations where these procedures are in effect
are indicated in the Airport/Facility Directory.
5-2-2. Pre-departure Clearance
Procedures
a. Many airports in the National Airspace System
are equipped with the Tower Data Link System
(TDLS) that includes the Pre-departure Clearance
(PDC) function. The PDC function automates the
Clearance Delivery operations in the ATCT for
participating users. The PDC function displays IFR
clearances from the ARTCC to the ATCT. The
Clearance Delivery controller in the ATCT can
append local departure information and transmit the
clearance via data link to participating airline/service
provider computers. The airline/service provider will
then deliver the clearance via the Aircraft Communications
Addressing and Reporting System
(ACARS) or a similar data link system or, for nondata
link equipped aircraft, via a printer located at the
departure gate. PDC reduces frequency congestion,
controller workload and is intended to mitigate
delivery/readback errors. Also, information from
participating users indicates a reduction in pilot
workload.
b. PDC is available only to participating aircraft
that have subscribed to the service through an
approved service provider.
c. Due to technical reasons, the following
limitations currently exist in the PDC program:
1. Aircraft filing multiple flight plans are
limited to one PDC clearance per departure airport
within a 24-hour period. Additional clearances will
be delivered verbally.
2. If the clearance is revised or modified prior to
delivery, it will be rejected from PDC and the
clearance will need to be delivered verbally.
d. No acknowledgment of receipt or readback is
required for a PDC.
e. In all situations, the pilot is encouraged to
contact clearance delivery if a question or concern
exists regarding an automated clearance.
5-2-3. Taxi Clearance
Pilots on IFR flight plans should communicate with
the control tower on the appropriate ground control or
clearance delivery frequency, prior to starting
engines, to receive engine start time, taxi and/or
clearance information.
5-2-4. Taxi into Position and Hold (TIPH)
a. Taxi into position and hold is an air traffic
control (ATC) procedure designed to position an
aircraft onto the runway for an imminent departure.
The ATC instruction “POSITION AND HOLD” is
used to instruct a pilot to taxi onto the departure
runway in takeoff position and hold.
EXAMPLETower:
“N234AR Runway 24L, position and hold.”
b. This ATC instruction is not an authorization to
takeoff. In instances where the pilot has been
AIM 2/14/08
5-2-2 Departure Procedures
instructed to “position and hold” and has been
advised of a reason/condition (wake turbulence,
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