“ about 1970 d/d HS-10, NAS Imperial Beach CA as SH-3A and the first with the Bendix AN/AQS-13 Dipping Sonar (previous BuNos had AN/AQS-10). Also had APN-171 radar altimeter instead of APN-117. All maintenance manuals listed this particular configuration as BuNo 152104 and subsequent. Received from NAS Patuxent River (Test Center), MD. It had only around 200 hours. After hundreds of maintenance hours tracking down some undocumented wiring modifications, was put in service HS-10 was West Coast ASW training squadron. As part of the training syllabus, the sonar hydrophone was removed, a plug put in the hole and the pilot-in-training was instructed in single-engine water landings and take-offs in a nearby fresh water lake On this particular airframe first such training mission, the pilot must have given it a little more than the prescribed amount of forward cyclic and the blade tips hit the water. The aircraft ended up submerged in the lake. A few days later, I watched it come back to NAS IB hanging from the bottom of an H-53, dripping water, with pieces of the main rotors visible and missing the tail (foldable) section). I was one of the maintenance types (AT rate) who spent so many hours getting it mission-capable, so I was quite distressed to see her crashed. She was hauled off and it was the last I saw her. Based on other posts, I see that she must have been salvaged and re-born as an SH-3H. Ed Sprnger - Then At-2 ”