OVERVIEW: The Tp 422 is a lightweight, helicopter‑launched, wire‑guided torpedo developed by Sweden in 1983 for anti-submarine warfare. It is part of the Tp 42 family and designed specifically for deployment by ASW helicopters.

DETAILS: “Tp” stands for Torped and the “422” variant was developed from the Tp 42 series by Förenade Fabriksverken (FFV) for use with the Swedish Navy’s ASW helicopters starting in 1983. The torpedo measures approximately 2.6 m in length with a 400 mm diameter, weighs 298 kg, and carries a 45 kg high-explosive warhead. It uses electric propulsion powered by silver‑zinc batteries, offers selectable speeds (typically 15, 25 or 35 kn), and is wire-guided with an active/passive acoustic seeker optimized for detecting submarines in littoral waters. The Tp 422 does not include a wire spool when deployed by helicopter, relying on its onboard homing head after being released from aircraft .

TYPE: Lightweight Helicopter-Launched Anti‑Submarine Torpedo

FUNCTION: Released from a helicopter into the water, the Tp 422 uses active/passive acoustic homing to track and engage submerged submarines. Designed for shallow and coastal environments, it operates without mid-course wire guidance once airborne-launched.

NOTE:
IOC: 1983 (Tp 422)
Manufacturer: Sweden (Förenade Fabriksverken / FFV)
Operators: Sweden (Royal Swedish Navy)
Platforms: ASW helicopters (Swedish Navy’s HKP‑4 series)

SOURCE:
Jane’s Naval Weapons Systems (“Torpedoes, Sweden” – Tp 42/422) ; Torpedoes Sweden P00002933; Swedish wiki Torped 41 entry (Tp 422 data).