SSP-FK Series 2

Fire detection logic of the SSP-FK Series 2

The SSP-FK Series 2 reacts not only to high temperature, but also to rapid temperature rise. This is important because a real fire in an engine or equipment compartment can develop very quickly, while a slowly warming area may have a different thermal profile. The system uses sensor groups installed in the protected zones and an executive block that processes their signals. When the detection threshold is reached, the system issues commands to cockpit warning lamps, sound warning circuits, and, depending on aircraft configuration, fire-extinguishing control circuits.

SSP-FK-BI Series 2 executive block

The central element of the system is the SSP-FK-BI Series 2 executive block. It receives signals from the sensor loops and forms the output commands for warning and fire-protection circuits. In practical terms, this block is the part that connects the sensors in the hot zones with the cockpit indication and control logic. Depending on the aircraft version, it may work with several independent fire zones. During maintenance, the block is checked together with sensor circuits, connector condition, lamp test functions, continuity of wiring, and correct response during system checks.

Sensors used with the SSP-FK Series 2

The SSP-FK Series 2 works with thermal fire sensors such as DTBG / DPS type sensors, depending on aircraft documentation. These sensors are installed directly in protected compartments where they can respond to fire conditions quickly. Sensor groups are usually arranged so that the system can detect a fire in a specific zone rather than only give a general warning. The number of sensors and grouping method depend on the aircraft type, protected area, and wiring scheme. Sensor placement is especially important around engines, gearbox areas, and heater compartments.

SSP-FK Series 2 in fire-extinguishing control

Besides warning the crew, the SSP-FK Series 2 can be integrated into the fire-extinguishing control logic. In many aircraft systems, the fire warning signal is connected with circuits that allow actuation of fire-extinguisher bottles through pyrotechnic valve heads and initiating cartridges. The system itself does not extinguish the fire and does not store extinguishing agent. It detects the condition and forms the electrical signals used by indication and control equipment. Therefore, troubleshooting should separate sensor condition, executive block operation, cockpit indication, and extinguisher release circuits.

Aircraft application of the SSP-FK Series 2

The SSP-FK Series 2 is used on Soviet and Russian aircraft and helicopters, including Mi-8, Mi-17 and Mi-26 family helicopters, depending on installed equipment and modification. Protected zones may include engine compartments, main gearbox areas, heater compartments, wing sections, or other fire-risk zones defined by aircraft documentation. The exact installation cannot be assumed only by aircraft type: it must be checked by the fire-protection system diagram, equipment list, and aircraft maintenance manual.

Inspection and supply of SSP-FK Series 2

When ordering SSP-FK Series 2 components, it is important to specify whether the requirement is for the complete system, the SSP-FK-BI executive block, the SSP-FK-BIS unit, sensors, connectors, or other installation parts. The executive block may be identified by its decimal drawing number, including DM4.568.019-01 for the Series 2 execution. Before installation, the equipment should be checked for passport, storage condition, connector integrity, compatibility with the sensor type, and compliance with the aircraft fire-warning system documentation.

Related system equipment: DPS, SSP-2I-RM, SSP-FK-BI Series 2. These positions are grouped by system function and installation context, not as interchangeable replacements.

Confirmed installation context includes Mi-8 / Mi-17 family helicopters. The exact execution and installation position must be checked against the illustrated parts catalogue and documentation for the specific aircraft.