Fighter planes may be heard above Preston in the evening from Tuesday through until Thursday.
AdvertisementDefence giant BAE Systems is carrying out night flying operations from Warton.
Night vision equipment is being tested in the Eurofighter Typhoon aircraft.
The flights will be between 9pm to 11pm from Tuesday until Thursday.
A spokesman for BAE said: “All efforts will be made to keep noise disturbance to local people to an absolute minimum.”