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29. Departure Procedures
29.1 Pre.Taxi Clearance Procedures
29.1.1 Locations where these procedures are in effect are indicated in the Airport/Facility Directory.
29.1.2 Certain airports have established programs whereby pilots of departing IFR aircraft may elect to receive their IFR clearances before they start taxiing for takeoff. The following provisions are included in such procedures:
29.1.2.1 Pilot participation is not mandatory.
29.1.2.2 Participating pilots call clearance delivery/ ground control not more than 10 minutes before proposed taxi time.
29.1.2.3 IFR clearance (or delay information, if clearance cannot be obtained) is issued at the time of this initial call.up.
29.1.2.4 When the IFR clearance is received on clearance delivery frequency, pilots call ground control when ready to taxi.
29.1.2.5 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.
29.1.2.6
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.

30.
Pre.departure Clearance Procedures

30.1 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 Commu-nications 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

Federal Aviation Administration Twentieth Edition
delivery/readback errors. Also, information from participating users indicates a reduction in pilot workload.
30.2 PDC is available only to participating aircraft that have subscribed to the service through an approved service provider.
30.3 Due to technical reasons, the following limitations currently exist in the PDC program:
30.3.1 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.
30.3.2 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.
30.4 No acknowledgment of receipt or readback is required for a PDC.
30.5
In all situations, the pilot is encouraged to contact clearance delivery if a question or concern exists regarding an automated clearance.

31.
Taxi Clearance

31.1
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.

32.
Line Up and Wait (LUAW)

32.1 Line up and wait is an air traffic control (ATC) procedure designed to position an aircraft onto the runway for an imminent departure. The ATC instruction “LINE UP AND WAIT” is used to instruct a pilot to taxi onto the departure runway and line up and wait.
EXAMPLE.
Tower: “N234AR Runway 24L, line up and wait.”
32.2 This ATC instruction is not an authorization to takeoff. In instances where the pilot has been instructed to “line up and wait” and has been 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.
32.3 If a takeoff clearance is not received within a reasonable amount of time after clearance to line up and wait, 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 “line up and wait” and the resulting event (for example, 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.
　
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