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AIM CHG 2
responsible civil aviation authority, and file appropri-
ate equipment information in ICAO field 10a and in
the ICAO field 18 DAT (Other Data Applications) of
the flight plan.
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 en-
gines, to receive engine start time, taxi and/or
5-2-4. Line Up and Wait (LUAW)
a. 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
Tower: "N234AR Runway 24L, line up and wait."
b. 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.
c. If a takeoff clearance is not received within a
reasonable amount of time after clearance to line up
and wait, ATC should be contacted.
Aircraft: Cessna 234AR holding in position Runway 24L.
Aircraft: Cessna 234AR holding in position Runway 24L
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, land-over
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.
Advisory Circulars 91-73A, Part 91 and Part 135 Single-Pilot Proced-
ures during Taxi Operations, and 120-74A, Parts 91, 121, 125, and 135
Flightcrew Procedures during Taxi Operations
d. Situational awareness during line up and wait
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.
e. Pilots should be especially vigilant when
conducting line up and wait operations at night or
during reduced visibility conditions. They should
scan the full length of the runway and look for aircraft
on final approach or landing roll out when taxiing
onto a runway. ATC should be contacted anytime
there is a concern about a potential conflict.
f. When two or more runways are active, aircraft
may be instructed to "LINE UP AND WAIT" on two
or more runways. When multiple runway operations
are being conducted, it is important to listen closely
for your call sign and runway. Be alert for similar
sounding call signs and acknowledge all instructions
with your call sign. When you are holding in position
and are not sure if the takeoff clearance was for you,
ask ATC before you begin takeoff roll. ATC prefers
that you confirm a takeoff clearance rather than
mistake another aircraft's clearance for your own.
g. When ATC issues intersection "line up and
wait" and takeoff clearances, the intersection
designator will be used. If ATC omits the intersection
designator, call ATC for clarification.
Aircraft: "Cherokee 234AR, Runway 24L at November 4,
line up and wait."
h. If landing traffic is a factor during line up and
wait operations, ATC will inform the aircraft in
position of the closest traffic that has requested a full-
stop, touch-and-go, stop-and-go, or an unrestricted
low approach to the same runway. Pilots should take
care to note the position of landing traffic. ATC will
also advise the landing traffic when an aircraft is
authorized to "line up and wait" on the same runway.
Tower: "Cessna 234AR, Runway 24L, line up and wait.
Traffic a Boeing 737, six mile final."
5-2-2 Departure Procedures