We used public transport to get to the museum. Take the train from Lisbon Rossio station to Portela de Sintra.
On alighting from the train use the underpass to get to the other side of the station. There is a line of several bus stops. With the station behind you, it is the next to the last one on your right. It is a green and white bus, destination Mafra, and appears to run roughly every hour. You can find a timetable on the mafrense website (http://www.mafrense.pt/).
You will know when you get to the museum because there is an aircraft preserved on your right hand side at the end of the road to the base & museum. From the stop it is 5 minutes brisk walk to the museum.
The museum itself has a varied collection of well preserved planes in two halls separated by a cafe area (unmanned when we were there, but with machines to get a drink and snack) and a doorway to the outside area where two of the larger exhibits are displayed.
The halls have plenty of windows so the exhibits are well lit, although the closeness of some, particularly the larger aircraft make photography difficult.
Aim to allow at least an hour for your visit.
Returning to Portela de Sintra it is not obvious what time the bus is at the museum stop, but if you look at the timetable, it will a few minutes after it leaves Facoa.
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