JO 7110.65 5-2-18

Inform an aircraft when you want it to turn on/off the automatic altitude reporting feature of its transponder.

PHRASEOLOGY-

SQUAWK ALTITUDE,

or

STOP ALTITUDE SQUAWK.

NOTE-

Controllers should be aware that not all aircraft have a capability to disengage the altitude squawk independently from the beacon code squawk. On some aircraft both functions are controlled by the same switch.

REFERENCE-

FAA Order JO 7110.65, Para 5-2-15 , Validation of Mode C Altitude Readout.

FAA Order JO 7110.65, Para 5-3-3 , Beacon/ADS-B Identification Methods.

P/CG Term - Automatic Altitude Report.