7 Sep 1943
Aircraft attack, aircraft shot down:British Wellington MP509 (172 Sqdn RAF/D, pilot F/O C.J. Payne)

At 23.03 hours, the outbound boat was located by radar by the Wellington aircraft MP791 (172 Sqdn RAF/Q, pilot F/O T. Armstrong) in the Bay of Biscay. The aircraft dropped six depth charges in a Leigh Light attack and then circled the boat after making a strafing run. At 23.13 hours, they observed another Wellington (172 Sqdn RAF/D) making a Leigh Light attack but it was hit by AA fire, caught fire and crashed into the sea. Their Wellington was damaged when the port tyre burst on landing at Chivenor, unknown to the crew the undercarriage had been hit twice by AA fire. U-402 had hit both attackers and escaped undamaged.

8 Sep 1943
At 06.18 hours, the outbound boat was attacked by the Wellington aircraft HF126 (612 Sqdn RAF/M, pilot F/O J.M. Bezer) in the Bay of Biscay. Investigating a radar contact the aircraft flew over the boat and turned for a Leigh Light attack. But the front guns jammed and the aircraft recieved several AA hits just before the six depth charges were released which did not damage U-402. The Wellington had been hit in the nose, fuselage, tail, in the port engine and the starboard wing and the crew had to jettison all loose equipment to reach Portreath on one engine after 90 minutes. (Sources: Franks/Zimmerman)

1 Oct 1943
The boat was attacked by an American Ventura aircraft (VB-128, US Navy) but suffered no damage.

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