SSP-2I-RM socket in aircraft fire warning systems

The SSP-2I-RM is an aircraft mounting socket and connector used for installing fire warning sensors in protected aircraft compartments. It is commonly used with DPS and DTBG type fire detectors in SSP-FK fire warning systems. In maintenance language, this part may be called the “DPS tail,” because it forms the local connection point between the detector and the aircraft wiring harness. Its role is simple but important: it holds the sensor in the required position and provides a stable electrical connection to the fire warning circuit.

SSP-2I-RM with DPS and DTBG detectors

The SSP-2I-RM is used where fire detectors are installed directly in engine bays, gearbox areas, heater compartments, or other fire-risk zones. The detector itself reacts to thermal conditions, while the socket provides the mechanical and electrical interface. If the socket contact is weak, corroded, loose, or damaged, the executive block may receive an incorrect signal even if the detector is serviceable. For this reason, the socket is normally checked together with the DPS / DTBG sensor, the wiring harness, and the SSP-FK-BI executive block.

Electrical connection through SSP-2I-RM

The SSP-2I-RM is a two-contact round connector intended for two-wire sensor circuits. In aircraft fire warning systems, DPS or DTBG sensors are often connected in groups, and the socket becomes part of that series chain. A fault in one socket can affect the whole group, especially where several sensors are connected to one channel. During troubleshooting, technicians normally check contact continuity, insulation condition, mechanical locking, wire condition, and whether the sensor is seated correctly in the socket.

Mechanical design of the SSP-2I-RM

The socket is built for harsh aircraft compartments, not for clean panel installation. The body is made from a corrosion-resistant metal alloy and is intended to tolerate vibration, temperature changes, fuel vapors, oil, hydraulic fluids, and general contamination typical of technical bays. The connector must keep the detector fixed under vibration and aircraft movement while still allowing removal for inspection or replacement. Damage to the body, threads, bayonet section, contacts or locking surfaces can make the sensor installation unreliable.

Cable outlet and protection of SSP-2I-RM

The SSP-2I-RM usually includes a protected cable outlet, often with a flexible metal braid or metal hose section. This protects the wires from mechanical rubbing, local heat exposure, debris, and vibration. In fire-risk compartments, the first stage of protection is especially important because wiring must remain intact long enough for the system to detect the fire and transmit the signal. A broken braid, exposed wire, poor crimp, loose shield or damaged insulation should be treated as a serious defect, not as a minor cosmetic issue.

Installation areas for SSP-2I-RM sockets

SSP-2I-RM sockets are installed in the same zones where DPS or DTBG fire detectors are mounted. On aircraft and helicopters, this may include engine compartments, main gearbox areas, heater zones, and other protected technical spaces. The exact position depends on the aircraft fire warning system layout. The socket should not be relocated only for easier access, because sensor position affects fire detection quality. Replacement should follow the aircraft maintenance manual, wiring diagram, and approved sensor installation scheme.

Supply and inspection of SSP-2I-RM

When ordering SSP-2I-RM, it is useful to specify whether the requirement is for the socket only, a socket with cable tail, a complete detector connection assembly, or installation hardware. The intended sensor type should also be stated: DPS, DPS-1AG, DTBG or another approved detector. Before installation, the part should be checked for contact condition, body damage, thread or bayonet wear, metal braid integrity, wire insulation, connector cleanliness, and compatibility with the SSP-FK / SSP-FK-BI fire warning system.

Product Type: Aircraft fire detector mounting socket / electrical connector
Designation: SSP-2I-RM / ССП-2И-РМ
Common Maintenance Name: DPS tail / “хвост ДПС”
Function: Mechanical mounting and electrical connection of aircraft fire warning sensors
Application / Where Used: Aircraft fire warning systems using DPS / DTBG type detectors
Parent System: SSP-FK / SSP-FK Series 2 fire warning system
Associated Executive Block: SSP-FK-BI Series 2, depending on aircraft configuration
Compatible Sensors: DPS, DPS-1AG, DTBG and approved similar fire detectors depending on documentation
System / Installation Area: Engine compartments, main gearbox areas, heater compartments and other protected aircraft zones
Connector Type: Two-contact round connector
Number of Contacts: 2
Circuit Type: Two-wire sensor circuit, often used in series-connected detector groups
Body Material: High-strength corrosion-resistant metal alloy, commonly aluminum alloy execution
Cable Protection: Flexible metal braid / metal hose or protected cable outlet depending on execution
Environmental Resistance: Designed for aircraft vibration, temperature changes, fuel, oil and hydraulic fluid exposure typical of technical compartments
Operating Temperature Note: Intended for fire-warning sensor installation zones with wide temperature exposure according to aircraft documentation
Mechanical Role: Fixes the fire detector in the required position and provides connection to the aircraft wiring harness
Technical Documentation: Product passport, SSP-FK system documentation and aircraft maintenance documentation as applicable

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