Federal Aviation Regulations Practice Test

In which scenario is an encoding altimeter required?

1. In uncontrolled airspace

2. In Class D airspace

3. In Class A and B airspace

4. Only during night flights

The correct answer is: In Class A and B airspace

An encoding altimeter is required in Class A and B airspace because these classes of airspace are specifically governed by strict air traffic control (ATC) procedures. The encoding altimeter provides a digital readout of the aircraft's altitude, which is transmitted to ATC to enhance situational awareness and ensure separation between aircraft. In Class A airspace, typically found above 18,000 feet mean sea level, all operations are conducted under instrument flight rules (IFR), and accurate altitude reporting is crucial due to the heavy traffic and the potential for altitude conflicts. Similarly, Class B airspace, which surrounds busy airports, requires precise altitude data from all aircraft to manage the complexity of high-density operations near major hubs. The use of an encoding altimeter allows ATC to monitor altitude in relation to the floor and ceiling of these airspace classes effectively. The other scenarios listed do not consistently require the use of an encoding altimeter. In uncontrolled airspace, the requirements for equipment are less stringent, and Class D airspace may not necessitate it unless specific conditions regarding aircraft operations and the presence of ATC are met. Night flights also do not inherently require an encoding altimeter; rather, the regulatory requirements are tied to the class of airspace