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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.
29.2 PDC is available only to participating aircraft
that have subscribed to the service through an
approved service provider.
29.3 Due to technical reasons, the following
limitations currently exist in the PDC program:
29.3.1 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.
29.3.2 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.
29.4 No acknowledgment of receipt or readback is
required for a PDC.
29.5 In all situations, the pilot is encouraged to
contact clearance delivery if a question or concern
exists regarding an automated clearance.
30. Taxi Clearance
30.1 Pilots on IFR flight plans should communicate
with the control tower on the appropriate ground
control/clearance delivery frequency prior to starting
engines to receive engine start time, taxi, and/or
clearance information.
31. Taxi into Position and Hold (TIPH)
31.1 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.
EXAMPLE−
Tower: “N234AR Runway 24L, position and hold.”
31.2 This ATC instruction is not an authorization to
takeoff. In instances where the pilot has been
instructed to “position and hold” and has been
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Nineteenth Edition Federal Aviation Administration
advised of a reason/condition (wake turbulence,
traffic on an intersecting runway, etc.) or the reason/
condition is clearly visible (another aircraft that has
landed on or is taking off on the same runway), and
the reason/condition is satisfied, the pilot should
expect an imminent takeoff clearance, unless advised
of a delay. If you are uncertain about any ATC
instruction or clearance, contact ATC immediately.
31.3 If a takeoff clearance is not received within a
reasonable amount of time after clearance to position
and hold, ATC should be contacted.
EXAMPLE−
Aircraft: Cessna 234AR holding in position Runway 24L.
Aircraft: Cessna 234AR holding in position Runway 24L
at Bravo.
NOTE−
FAA analysis of accidents and incidents involving aircraft
holding in position indicate that two minutes or more
elapsed between the time the instruction was issued to
“position and hold” and the resulting event (e.g., landover
or go−around). Pilots should consider the length of time
that they have been holding in position whenever they
HAVE NOT been advised of any expected delay to
determine when it is appropriate to query the controller.
REFERENCE−
Advisory Circulars 91−73A, Part 91 and Part 135 Single−Pilot
Procedures during Taxi Operations, and 120−74A, Parts 91, 121, 125,
and 135 Flightcrew Procedures during Taxi Operations.
31.4 Situational awareness during position and hold
operations is enhanced by monitoring ATC
instructions/clearances issued to other aircraft. Pilots
should listen carefully if another aircraft is on
frequency that has a similar call sign and pay close
attention to communications between ATC and other
aircraft. If you are uncertain of an ATC instruction or
clearance, query ATC immediately. Care should be
taken to not inadvertently execute a clearance/
instruction for another aircraft.
　
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