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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. 



3.  IFR Clearances Off Uncontrolled 



Pilots departing on an IFR flight plan should 

consult the Chart Supplement U.S. to determine the 
frequency or telephone number to use to contact 
clearance delivery. On initial contact, pilots should 
advise that the flight is IFR and state the departure and 
destination airports. 


Air traffic facilities providing clearance deliv-

ery services via telephone will have their telephone 
number published in the Chart Supplement U.S. of 
that airport’s entry. This same section may also 
contain a telephone number to use for cancellation of 
an IFR flight plan after landing. 


Except in Alaska, pilots of MEDEVAC flights 

may obtain a clearance by calling 1






4.  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 
clearance information. 



5.  Line Up and Wait (LUAW) 


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. 



Tower:  “N234AR Runway 24L, line up and wait.” 


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. 


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 
at Bravo. 



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


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 


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. 


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. 


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 



Departure Procedures