SSP-FK-BIS

SSP-FK-BIS block in the aircraft fire warning system

The SSP-FK-BIS is an executive system block used in the SSP-FK aircraft fire warning system. It is part of the onboard fire-protection equipment installed on aircraft and helicopters, including Mi-8 family helicopters depending on configuration. The block receives electrical signals from fire detectors installed in protected compartments and switches the required warning and control circuits. In the overall system, the SSP-FK-BIS works between the thermal sensors in fire-risk zones and the cockpit indication, warning, and fire-extinguishing control circuits.

Signal processing by the SSP-FK-BIS

The SSP-FK-BIS processes the thermoelectric signal generated by fire detectors such as DPS / DPS-1A type sensors. When temperature rises sharply in a protected compartment, the detector group produces a signal that is sent to the block. The SSP-FK-BIS evaluates this signal according to the system logic and, when the threshold condition is reached, switches the corresponding output circuits. The block does not detect flame optically and does not contain extinguishing agent. Its function is electrical processing and command output within the fire warning system.

SSP-FK-BIS with DPS fire detectors

In the SSP-FK system, DPS sensors are installed in zones such as engine compartments, gearbox areas, heater compartments, or other fire-risk sections. The sensors are usually connected through sockets and aircraft wiring harnesses, often in grouped circuits. The SSP-FK-BIS receives the resulting signal from these detector chains. For reliable operation, the block must match the detector type, wiring scheme, channel layout, and aircraft documentation. A fault in a sensor, socket, wiring group, or connector can affect the signal before it reaches the block.

Warning and crew indication through SSP-FK-BIS

When the SSP-FK-BIS confirms a fire signal, it activates the warning circuits provided by the aircraft system. These may include cockpit “FIRE” warning lamps, sound warning circuits, voice warning equipment, and signal outputs to onboard recording equipment depending on the aircraft configuration. The block is therefore not only a sensor-processing unit, but also a link between the fire-detection system and the crew interface. During system checks, technicians usually verify both detector input response and correct cockpit indication.

SSP-FK-BIS and fire-extinguishing control circuits

The SSP-FK-BIS can also be connected with fire-extinguishing control circuits, including circuits that command the release of extinguishing agent from onboard fire bottles. In aircraft systems, this may involve pyrotechnic cartridges and bottle release heads, depending on the fire-protection layout. The exact logic may differ by aircraft type and modification. For this reason, the SSP-FK-BIS should be checked as part of the complete fire-protection chain: detectors, sockets, wiring, cockpit controls, circuit breakers, warning lamps, release circuits, and extinguisher bottles.

Built-in test function of the SSP-FK-BIS

The SSP-FK-BIS supports operational checking of the fire warning system without actual release of extinguishing agent. This is important for pre-flight checks and maintenance, because the crew or technician must confirm that warning circuits and sensor channels are serviceable. The test function helps identify faults in the detection and indication chain before flight. However, test results should always be interpreted according to the aircraft maintenance documentation, since the block is only one part of a wider electrical and fire-protection system.

Supply and identification of SSP-FK-BIS

When ordering the SSP-FK-BIS block, the full designation should be stated together with the aircraft type, system version, and required condition. It is useful to clarify whether the request is for the BIS block only, a complete SSP-FK system set, sensors, sockets, connectors, or repair stock. Before installation, the unit should be checked for passport, storage condition, connector condition, category, serviceability, compatibility with DPS-type sensors, and compliance with the aircraft fire warning system documentation.

Product Type: Aircraft fire warning system executive block
Designation: SSP-FK-BIS / ССП-ФК-БИС
Function: Processing of fire detector signals and switching of warning / fire-protection circuits
Application / Where Used: Aircraft and helicopter fire warning and fire-protection systems
Parent System: SSP-FK fire warning system
Typical Aircraft Application: Mi-8 family helicopters and other aircraft depending on configuration
System / Installation Area: Fire warning control equipment, technical compartment, radio compartment or other equipment area depending on aircraft layout
Input Sensors: DPS / DPS-1A fire detectors and compatible sensors according to aircraft documentation
Signal Type: Thermoelectric signal generated by fire detectors during rapid temperature rise
Main Output Functions: Cockpit fire warning, sound warning, signal output to related aircraft systems and fire-extinguishing control circuits depending on configuration
Associated Cockpit Indication: “FIRE” warning lamps / annunciators
Associated Aircraft Systems: Voice warning system and flight recorder signal circuits depending on aircraft wiring
Associated Release Circuits: Fire bottle pyrotechnic cartridge / release-head circuits depending on system configuration
Built-In Control: Operational system check without extinguishing-agent release
Typical Protected Zones: Engine compartments, main gearbox area, heater compartment and other fire-risk zones depending on aircraft type
Required Matching: Sensor type, wiring scheme, channel layout and aircraft fire-protection documentation
Condition: New, from storage, repaired or serviceable condition to be specified separately
Technical Documentation: Product passport, SSP-FK system documentation and aircraft maintenance documentation as applicable

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Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.

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.