Which suffix would be used for an aircraft equipped with LORAN and no transponder?

The suffix used for an aircraft equipped with LORAN and no transponder is /Y. This designation is specifically meant for aircraft that utilize LORAN (Long Range Navigation) for navigation purposes but do not have a Mode S transponder.

LORAN is an older navigation system that was widely used before satellite technology became prevalent, and it operates independently of transponder systems. The use of the /Y suffix allows air traffic controllers to identify that the aircraft has LORAN capabilities, which informs them about the type of navigational aid being used.

The other suffixes refer to different equipment configurations. For instance, /C is typically used for aircraft equipped with a VOR (VHF Omnidirectional Range) navigation system and may also include a transponder, while /D refers to aircraft with DME (Distance Measuring Equipment) and/or transponder. The suffix /M is generally used for aircraft equipped with a Mode S transponder, which again does not apply in this case since we are dealing with an aircraft that lacks a transponder.

Understanding these designations is critical for ensuring effective communication and coordination between non-radar controllers and pilots, particularly when dealing with varying levels of aircraft navigation capabilities.