Question

I ask you to confirm that the following sentences are correct.

Guide to Access Control at Aerospace Museum Observatory - Closing dates for the Observatory 

Please note that access to the observatory is controlled - maybe limited would be better for the safety of visitors due to the renewal - maybe maintenance of the aerospace museum observation deck.     I think you are trying to say "The Aerospace Museum Observatory will be closed due to maintence for safety purposes at the following time." - this is a common warning sign. 

Access control period: 2018.11.19 (Mon) to 2018.12.20 (Thu)