GSR-18000M

GSR-18000M high-output DC generator

GSR-18000M is an 18 kW engine-driven DC generator intended to feed an aircraft primary electrical network. Technical and aircraft-system references identify it as a high-current generator mounted on the engine. Published values consistently indicate a 28.5 V system and an output class of approximately 600 A; the exact series and nameplate remain controlling for installation.

Documented aircraft and engine applications

GSR-18000M is documented on the Tupolev Tu-95 family, where eight generators—two per engine—feed the primary DC buses in parallel with 12SAM-55 batteries as emergency sources. A Tupolev Tu-128 description lists one generator per engine working in parallel with 12SAM-23 batteries. Two units are also documented on each RD-3M-500 engine installation.

Electrical-system context

The generator supplies the main DC network; it is not the same device as the SGO-series AC generators or PO/PT rotary converters used elsewhere in the same aircraft. On Tu-95 descriptions, SGO-30U machines supply variable-frequency AC while PO-4500 and PT-series converters support stable-frequency loads. This separation matters when identifying the required unit and selecting cross-system equipment.

Brush gear and inspection

Published brush catalogues associate GSR-18000M with MGS-7i carbon brushes, a 4 × 20 × 26.5 mm block arrangement, three pieces per group and eight groups in the machine. Incoming inspection should verify the exact brush drawing, collector condition, bearings, drive end, cooling passages, high-current terminals and insulation. Brush data help identify service parts but do not replace the generator passport.

Selection and ordering GSR-18000M

Reference data list a mass of approximately 41.5 kg for an engine-mounted GSR-18000M. Speed, rotation, drive coupling and cooling requirements should be taken from the exact series manual and aircraft installation data. A related 555.143 brush card is available for component-level review; catalogue links do not declare interchangeability or serviceability.

Product Type: High-output engine-driven DC generator
Part Number: GSR-18000M
Original Cyrillic Designation: ГСР-18000М
Electrical Output: Direct current
Nominal Power: 18 kW
Nominal Voltage: 28.5 V DC
Published Current Class: Approximately 600 A; verify the exact series passport
Installation: Engine-mounted in documented aircraft applications
Published Mass: Approximately 41.5 kg
Documented Aircraft 1: Tupolev Tu-95 family
Tu-95 Installation: Eight generators; two per engine in the documented system
Tu-95 Battery Context: 12SAM-55 batteries as emergency DC sources
Documented Aircraft 2: Tupolev Tu-128
Tu-128 Installation: One generator per engine; parallel operation on a common network
Tu-128 Battery Context: 12SAM-23 batteries in the documented system
Documented Engine Context: RD-3M-500; two generators per engine installation
Brush Grade: MGS-7i in published brush catalogues
Brush Block Data: 4 × 20 × 26.5 mm arrangement for the documented GSR-18000M entry
Brush Grouping: 3 pieces per group; 8 groups in the documented entry
Operating Speed: Confirm from the exact series passport
Rotation and Drive: Confirm from the engine installation manual and nameplate
Cooling: Confirm from the exact aircraft and generator documentation
Compatibility Check: Verify series, nameplate, drive, rotation, mounting, terminals, cooling and protection

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