Nummer: 17910
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 17.03.1944 |
| Time of attack : | 12:59 |
| Nationality of U-boat : | German |
| U-boat : | U 311 |
| Commander : | Zander |
| Grid : | BE 2247 |
| presumed target type : | Destroyer |
| presumed result : | sunk |
| Used weapon(s) : | Acoustic homing torpedo (gnat) |
| Convoy : | ONS.31 |
| Actual tonnage : | ---- -- |
| Actual result : | hit not ascertained |
| Footnote : | U-311 reported a gnat end-of-run detonation after 13:05 min. |
| Convoy : | ONS.31 |
| Route of convoy : | United Kingdom - North America (slow) |
| Remark to convoy : | 2nd series: Apr 1943 with new numbering (counter traffic SC) |