OVERVIEW: The TST‑47 is a 140 mm infrared decoy flare round introduced by the Soviet Navy in 1970. It is launched from trainable PK‑2 deck-mounted launchers to seduce incoming heat-seeking threats.

DETAILS: The TST‑47 is part of a family of expendable decoys deployed from the PK‑2 dual-barrel, trainable launcher system. It carries an infrared/emitting payload and was designed alongside the chaff round TSP‑47 and combined-effect TSO‑47, all developed by the Institute for Applied Physics in Novosibirsk. The round weighs approximately 37.5 kg and deploys its thermal payload at standoff distances from 500 m to several kilometers after launch. PK‑2 systems equipped with TST‑47 rounds were installed on major Soviet-era surface combatants, including the Kiev, Udaloy-I, Moskwa, and Slava-class vessels.

FONCTION:
Fired from a trainable PK‑2 launcher after IR-threat detection.
Propels to a preset distance before releasing its infrared payload.
Creates a hot signature to lure heat-seeking missiles away from the ship.

SOURCE:
German Wikipedia – “PK‑2” article (TST‑47 data)