Which item is NOT listed among required IFR equipment prior to takeoff in controlled airspace?

Which item is NOT listed among required IFR equipment prior to takeoff in controlled airspace?

• A. Communication
• B. Navigation
• C. Identification
• D. Altimeter

Answer: (D)

Before takeoff in controlled airspace under IFR, ATC relies on three things: you can communicate with ATC so you can receive and comply with instructions; you have navigation equipment capable of guiding you along the assigned route; and you can be identified on radar (typically via a functioning transponder with altitude reporting). These elements are the ones ATC specifically requires you to have operable before departure. The altimeter, while a fundamental flight instrument needed for IFR flight and altitude awareness, isn’t singled out in this particular preflight IFR equipment list. It’s assumed as part of the basic instrument set that must be functional, but the checklist in this context focuses on communication, navigation, and identification (transponder) capabilities.

Before takeoff in controlled airspace under IFR, ATC relies on three things: you can communicate with ATC so you can receive and comply with instructions; you have navigation equipment capable of guiding you along the assigned route; and you can be identified on radar (typically via a functioning transponder with altitude reporting). These elements are the ones ATC specifically requires you to have operable before departure.

The altimeter, while a fundamental flight instrument needed for IFR flight and altitude awareness, isn’t singled out in this particular preflight IFR equipment list. It’s assumed as part of the basic instrument set that must be functional, but the checklist in this context focuses on communication, navigation, and identification (transponder) capabilities.