Nummer: 16403a
| Area : | Western Area |
| Sea area : | North Atlantic |
| Date of attack : | 29.04.1943 |
| Time of attack : | 05:14 |
| Nationality of U-boat : | German |
| U-boat : | U 532 |
| Commander : | Junker |
| Grid : | AD 7856 |
| presumed target type : | Steam Freighter |
| presumed result : | damaged |
| Used weapon(s) : | Torpedo(es) |
| Convoy : | ONS.5 |
| Footnote : | U-532 fired a 4-torpedo spread and heard detonations after 7:30 min and 7:00 min. HMS "Snowflake" observed missing shots. |
| related attacks : | Angriff 1 |
| Convoy : | ONS.5 |
| Route of convoy : | United Kingdom - North America (slow) |
| Remark to convoy : | 2nd series: Apr 1943 with new numbering (counter traffic SC) |