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AIM 

6/17/21 

ADS

B transmissions once established within the 

formation. 

NOTE

 

If the formation flight is receiving ATC services, pilots can 
expect ATC to direct all non

lead aircraft to STOP 

SQUAWK, and should not do so until instructed. 

h.  Cooperative Surveillance Phraseology 

Air traffic controllers, both civil and military, will use 
the following phraseology when referring to 
operation of cooperative ATC surveillance equip-
ment. Except as noted, the following ATC 
instructions do not apply to military transponders 
operating in other than Mode 3/A/C/S. 

1.  SQUAWK (number). 

Operate radar beacon 

transponder/ADS

B on designated code with altitude 

reporting enabled. 

2.  IDENT. 

Engage the “IDENT” feature (mili-

tary I/P) of the transponder/ADS

B. 

3.  SQUAWK (number) AND IDENT. 

Oper-

ate transponder/ADS

B on specified code with 

altitude reporting enabled, and engage the “IDENT” 
(military I/P) feature. 

4.  SQUAWK STANDBY. 

Switch transpon-

der/ADS

B to standby position. 

5.  SQUAWK NORMAL. 

Resume normal 

transponder/ADS

B operation on previously as-

signed code. (Used after “SQUAWK STANDBY,” or 
by military after specific transponder tests). 

6.  SQUAWK ALTITUDE. 

Activate Mode C 

with automatic altitude reporting. 

7.  STOP ALTITUDE SQUAWK. 

Turn off 

automatic altitude reporting. 

8.  STOP SQUAWK (Mode in use). 

Stop 

transponder and ADS

B Out transmissions, or switch 

off only specified mode of the aircraft transponder 
(military). 

9.  SQUAWK MAYDAY. 

Operate transpon-

der/ADS

B in the emergency position (Mode A Code 

7700 for civil transponder. Mode 3 Code 7700 and 
emergency feature for military transponder.) 

10.  SQUAWK VFR. 

Operate radar beacon 

transponder/ADS

B on Code 1200 in the Mode A/3, 

or other appropriate VFR code, with altitude 
reporting enabled. 

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21.  Airport Reservation Operations 

and Special Traffic Management Programs 

This section describes procedures for obtaining 
required airport reservations at airports designated by 
the FAA and for airports operating under Special 
Traffic Management Programs. 

a.  Slot Controlled Airports. 

1. 

The FAA may adopt rules to require advance 

operations for unscheduled operations at certain 
airports. In addition to the information in the rules 
adopted by the FAA, a listing of the airports and 
relevant information will be maintained on the FAA 
website listed below. 

2. 

The FAA has established an Airport 

Reservation Office (ARO) to receive and process 
reservations for unscheduled flights at the slot 
controlled airports. The ARO uses the Enhanced 
Computer Voice Reservation System (e

CVRS) to 

allocate reservations. Reservations will be available 
beginning 72 hours in advance of the operation at the 
slot controlled airport. Standby lists are not 
maintained. Flights with declared emergencies do not 
require reservations. Refer to the website or 
touch

tone phone interface for the current listing of 

slot controlled airports, limitations, and reservation 
procedures. 

NOTE

 

The web interface/telephone numbers to obtain a 
reservation for unscheduled operations at a slot controlled 
airport are: 
1. http://www.fly.faa.gov/ecvrs. 
2. Touch

tone: 1

800

875

9694 

3. Trouble number: 540

422

4246. 

3. 

For more detailed information on operations 

and reservation procedures at a Slot Controlled 
Airport, please see 14 CFR Part 93, Subpart K – High 
Density Traffic Airports. 

b.  Special Traffic Management Programs 

(STMP). 

1. 

Special procedures may be established when 

a location requires special traffic handling to 
accommodate above normal traffic demand (for 
example, the Indianapolis 500, Super Bowl, etc.) or 
reduced airport capacity (for example, airport 
runway/taxiway closures for airport construction). 
The special procedures may remain in effect until the 
problem has been resolved or until local traffic 

Services Available to Pilots 

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