SSP-FK Series 2

SSP-FK Series 2 fire warning system for aircraft

The SSP-FK Series 2 is an aircraft fire warning system used to detect fire conditions in protected compartments of helicopters and fixed-wing aircraft. It is commonly associated with engine bays, main gearbox compartments, heater zones, and other areas where early fire detection is critical. The system monitors thermal conditions through fire sensors and sends a signal to the cockpit when the protected zone reaches a fire-danger condition. On helicopters such as Mi-8, Mi-17 and Mi-26, systems of this type are part of the aircraft’s fixed fire-protection equipment.

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.

Product Type: Aircraft fire warning system
Designation: SSP-FK Series 2 / ССП-ФК серия 2
Function: Fire detection and warning in protected aircraft compartments
Application / Where Used: Aircraft and helicopter fire-protection systems
System / Installation Area: Engine compartments, main gearbox areas, heater compartments, wing or technical compartments depending on aircraft type
Typical Aircraft Application: Mi-8, Mi-17, Mi-26 helicopters and other aircraft depending on configuration
Main Executive Block: SSP-FK-BI Series 2
Additional Unit / Related Block: SSP-FK-BIS, depending on system configuration
Typical Sensors: DTBG / DPS thermal fire sensors, depending on aircraft documentation
Power Supply: 27 V DC
Permitted Voltage Range: 18–30 V DC
Operating Principle: Fire detection through thermal sensor signals and executive relay logic
Detection Criteria: Rapid temperature rise and high-temperature threshold
Temperature Rise Response: More than approximately 2–3 °C/s
High-Temperature Response: Guaranteed response at compartment temperature above +150 °C
System Inertia / Response Time: Less than 1 s
Executive Block Operating Temperature Range: −60 to +70 °C
Sensor Operating Temperature Range: −60 to +350 °C
Relative Humidity: Up to 98% at +35 °C
Altitude / Low-Pressure Capability: Operation at atmospheric pressure down to 15 mm Hg
Number of Control Channels: Typically up to 4–6 independent zones per executive block, depending on configuration
Sensor Capacity: Up to 12–18 DTBG / DPS sensors per block, grouped according to aircraft wiring scheme
Sensor Grouping: Often connected in groups of 3 sensors in series, depending on system design
Executive Block Drawing Number: DM4.568.019-01 for Series 2 execution
System Functions: Fire detection, cockpit light and sound warning, pre-flight test, fire-extinguishing control signal output depending on aircraft configuration
Technical Documentation: Product passport, fire-warning system documentation and aircraft maintenance documentation as applicable

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Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.