OVERVIEW: The Mk103 is a helicopter-towed mechanical mine sweep system designed to cut the mooring cables of floating naval mines. It allows for surface clearance of moored mines in shallow and open waters during airborne mine countermeasure operations.

DETAILS: The Mk103 consists of a towed array featuring otters, depressors, and a sweep wire fitted with mechanical cutters. It is deployed from MH-53E Sea Dragon helicopters and maintains a set depth profile through a depressor system while in tow. As the sweep passes through a mined area, the cutters sever the anchoring cables of moored mines, allowing them to rise to the surface for visual marking and neutralization. It is often used in conjunction with other mine countermeasure systems such as sonar detection (AQS series) and influence sweeps (Mk104, Mk105). The system enhances helicopter-based MCM effectiveness without requiring surface vessels to enter mined areas.

FUNCTION: Towed behind a helicopter at controlled speed and altitude, the Mk103 sweep wire maintains tension and depth while cutting mine tethers. The surfaced mines are then either detonated remotely or recovered by EOD teams for disposal.

NOTE:
IOC: 1970s
Operators: United States Navy
Platforms: MH-53E Sea Dragon
Conflict used in: Operational mine clearance and training missions; no confirmed combat use

SOURCE: US Navy Mine Warfare Manual ; Naval Air Systems Command documentation ; GlobalSecurity.org mine countermeasure system overview ; Designation-Systems.net Mk103 entry