Rust debris has begun falling from the structure, meaning passengers are using an alternative entrance to the terminal building.
The problem became apparent during the afternoon of 21 August.
Passengers on inbound Aurigny flights are instead having to use the entrance set up to keep social distancing during the pandemic.
The concrete legged control tower is several decades old and has a number of steel elements to it.
An engineering inspection will take place today, 22 August.
Work was due to be underway by now on the complete refurbishment of the airport, including lengthening the runway.
But it has been paused, after it came in £13M over budget.
More affordable alternatives are being considered.
Guernsey's Chief of Police shares three year plan
Islanders rally together to donate a bus to a children's charity
Disabled islanders lead inclusion training for Guernsey deputies
‘Dementia suits’ used to promote empathy in Guernsey
Guernsey Air Display takes off in the evening
Funding shortfall leaves scaffolding on Guernsey Airport indefinitely
Guernsey's Education President responds to La Mare Sixth Form criticism
Brittany Ferries reports 29% increase in Guernsey travel
