Originally Posted by
tmmorris
I thought a military ATZ was active H24 regardless of whether ATC was open?
No If you're talking about an ATZ as per the ANO, there's a list at ENR 2.2-1 giving hours of operation of the ATZ for all military airfields apart from Henlow and some other places (eg South Cerney) which apparently don't have one at all.
These are the published hours for the ATZ, not necessarily the same the operational hours of the airfield. If the AIP can't get it right, who can?