The old(er) civil Westinghouse PAR equipment had superb accuracy, five feet up/down on the glidepath, same laterally.
However, as these had (according to one PAR operator I met at KLAX many years ago) 135 vacuum tubes (valves for you UK folks) it became very expensive to maintain...so away it went, west.
And yes, PAR was used during the Berlin airlift by USAF C-54 pilots...complete blind landings were possible, and I personally know one retired USAF Colonel/FAA inspector) who has done this many times...
Great fun, apparently.
