P/O J. Malinowski reported for duty with 317 Squadron (then at Acklington) on 25th February 1941.
On 2nd July, Jan returned from Sector reconaissance, and whilst taxiing after landing, he ran off the runway and damaged Hurricane V.7339.
On 10th July, the whole squadron took off acting in wing support of Blenheims taking part in raid on Le Havre. Their formation was attacked by Me109s and (Sergeant) Malinowski shot one of three down, after which they returned to Priston.

On 15th February 1942, Sgt. Pilots Brzeski and Jan Malinowski, operating from Bolthead were ordered to Scramble at 08.15 hours and intercepted an aircraft, but owing to the mist mistook it for a Focke Wulf and shot it down. Unfortunately it was later confirmed to be a friendly aircraft.
On 20th July, a day of thick haze, (Flight Sergeant) Malinowski's aircraft was hit while on Rhubarb over France, but managed to safely return to base.