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. IFR Clearances Off Uncontrolled Airports 

a. 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. 

b. 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. 

c. Except in Alaska, pilots of MEDEVAC flights may obtain a clearance by calling 1 − 877 − 543 − 4733. 

## 5 − 2 − 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 − 2 − 5. 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 and wait. 

## EXAMPLE − 

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. 

## 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, 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. 

## REFERENCE − 

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 

