Which term describes clearance that is requested but not yet received after filing a flight plan?

• A. The time at which the departure clearance is automatically canceled if takeoff has not been made.
• B. Glossy ice formed by slow freezing of large, supercooled water droplets.
• C. An IFR clearance not yet received after filing a flight plan.
• D. The ratio of compressor discharge pressure to compressor inlet pressure.

Answer: (C)

When you file an IFR flight plan and ATC hasn’t issued the actual clearance yet, that clearance is described as an outstanding IFR clearance. This term precisely captures the situation: the clearance has been requested, but you have not yet received it from ATC. It means you’re waiting for permission to proceed with the IFR flight, and the status ends once ATC provides the clearance (or you cancel the filing).

The other items refer to different concepts: the departure clearance void time is a deadline after which a clearance is void if you haven’t departed, a type of ice, and a compressor pressure ratio. None of these describe the status of a clearance after filing.