On 17 December U-131 was spotted by a Grumman Martlet aircraft from the escort carrier  while shadowing Convoy HG 76 as part of the Seeräuber (English: "Pirate", lit.
On December 17th, U-131 was detected by a Grumman Martlet aircraft from the escort carrier while trailing Convoy HG 76 during the Seeräuber operation.