Pilot Institute

FEBRUARY 28, 2025

Lets say youre cruising at 10,000 feet when Air Traffic Control (ATC) instructs you to “squawk 1200.” Mode A sends squawk codes, Mode C adds altitude, and Mode S transmits detailed flight data. The transponder is the airborne portion of the Air Traffic Control Radar Beacon System (ATCRBS).

Transponder 52

Transponder Air Traffic Control Visual Flight Rules True Airspeed 52

Pilot Institute

MARCH 6, 2025

AGL Above Ground Level AGL is simply a way to tell the basis from which any given height or altitude is measured. Simply put, 400 feet AGL means that the 400 feet is measured from the underlying ground surface above the specific airspace. This is as opposed to other altitude measurements, such as AMSL or above mean sea level.

Pilot 52

Pilot Weather Air Traffic Control NOTAMs 52

Universal Weather

JANUARY 24, 2025

El Salvador All flights operating over the landmass of El Salvador will require ADS-B. Requirements apply only to instrument flight rule (IFR) flights and only for aircraft with a maximum takeoff weight (MTOW) of 5700 kg (12,566 lbs.) For more information, see AIC 46/24. Europe ADS-B is mandated for all aircraft.

True Airspeed 59

True Airspeed Instrument Flight Rules Knot Air Traffic Control 59

Universal Weather

APRIL 9, 2024

El Salvador Starting on June 24, 2022, all flights operating over the landmass of El Salvador will require ADS-B. Requirements apply only to instrument flight rule (IFR) flights and only for aircraft with a maximum takeoff weight (MTOW) of 5700 kg (12,566 lbs.) For more information, see AIC 81/22.

True Airspeed 52

True Airspeed Instrument Flight Rules Knot Air Traffic Control 52