Radars at Ronaldsway Airport still haven't been approved fully by the UK Civil Aviation Authority.
That's despite government paying almost £3 million to the contractor Selex which is carrying out work on them.
The secondary radar - which has been operating on an "extraordinary licence" - keeps failing and requires a new antenna to keep working.
The primary radar which is being used is also undergoing maintenance to keep it working.
Infrastructure Minister Phil Gawne says it's not an ideal position to be in - but there is a back-up plan:
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