GS-12TO

GS-12TO aircraft starter-generator

GS-12TO is a 12 kW DC starter-generator used on auxiliary gas-turbine installations. In starter mode it cranks the compressor rotor for engine start and cold cranking. After the starting cycle it changes to generator mode and supplies the aircraft 27 V DC network. The same machine therefore performs two different duties, and both its electrical connections and its mechanical drive interface must match the documented installation.

Function with TA-6A and TA-8 auxiliary power units

Technical descriptions identify GS-12TO on TA-6A and TA-8 installations. The TA-6A configuration is documented on the Il-76 family, where the auxiliary power unit supports autonomous engine start and ground services. The generator may supply the onboard DC network on the ground and in flight up to the documented APU operating altitude. Exact aircraft effectivity still depends on the APU and aircraft modification.

GS-12TO generator-mode performance

The recorded generator-mode rating is 28.5 V, 400 A and 12 kW. The documented armature-speed range is 5,680–7,000 rpm and the generator duty is continuous. Voltage regulation, reverse-current protection and network connection are provided by the aircraft electrical system rather than by the GS-12TO alone. Manuals for the reviewed installation associate the channel with RN-180M voltage regulation and DMR-400T-series network protection.

Starting mode and connected equipment

For starting, the recorded supply range is 20–30 V DC with average current not exceeding 600 A during the defined start cycle. The output shaft is disconnected at approximately 3,000 rpm in the documented installation. The exact switching sequence, time limits and permitted repeated starts are controlled by the approved APU starting system; values from other GS-12 variants must not be substituted.

Identification, inspection and ordering

Selection requires the complete GS-12TO marking, rotation and drive data, connector arrangement and APU effectivity. Inspect the housing, drive end, terminals, cooling openings, fasteners and nameplate before bench testing. State the APU and aircraft type, quantity and documentation requirements in the enquiry. Related units are listed under Generators & Starter-Generators.

Product Type: Aircraft DC starter-generator
Part Number: GS-12TO
Original Cyrillic Designation: ГС-12ТО
Primary Function: Starting an auxiliary gas-turbine engine and supplying the aircraft DC network
Documented APU Context: TA-6A and TA-8 installations
Documented Aircraft Context: Il-76 family with TA-6A; other applications require confirmation
Generator Voltage: 28.5 V DC
Generator Current: 400 A
Generator Power: 12 kW
Generator Speed: 5,680–7,000 rpm
Generator Duty: Continuous
Starter Supply: 20–30 V DC
Average Starting Current: Not more than 600 A for the documented start cycle
Starter Disconnect Speed: Approximately 3,000 rpm at the output shaft in the documented installation
Associated Regulation and Protection: RN-180M voltage regulator and DMR-400T-series protection in the reviewed TA-6A channel
Alternative Designations: GS-12TO; GS12TO; GS 12TO; ГС-12ТО; ГС12ТО
Compatibility: Confirm APU modification, drive, rotation, connectors and aircraft electrical diagram
Documentation: Product passport and approved APU/aircraft maintenance documentation

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