GS-18TP

GS-18TP aircraft DC starter-generator

GS-18TP is an 18 kW-class aircraft DC starter-generator. It operates as an electric starter during engine acceleration and as a continuous-duty generator after the engine reaches self-sustaining speed. The TP suffix is part of the product identity and must be retained when matching an existing unit, even when another GS-18 execution has similar voltage and current data.

Documented aircraft application

Mi-8 maintenance documentation lists GS-18TP among the permitted starter-generator types for the Mi-8 electrical system. Published equipment descriptions also identify GS-18TP starter-generators in the DC system of the Tu-22. These records confirm aviation use but do not establish that one execution, drive or connector arrangement is interchangeable across both aircraft families.

Electrical ratings in generator mode

The documented GS-18 family data for the reviewed Mi-8 installation are 28.5 V DC and 600 A, corresponding to an 18 kW class rating. The recorded operating-speed band is approximately 4,200–9,000 rpm and the generator duty is continuous. The aircraft voltage regulator, reverse-current protection, feeder protection and switching equipment must match the installed electrical channel.

Starting duty and cooling requirements

In starting operation, the recorded family data include 30 V supply, current up to 600 A and approximately 2,400 rpm at the output shaft within the documented tolerance. Starter duty is intermittent and limited by the approved starting sequence. The TP installation uses forced-air cooling; the cooling connection and airflow must be checked rather than inferred from a similar GS-18 housing.

Selection, inspection and ordering

Confirm the exact GS-18TP nameplate, series, rotation, drive interface, cooling connection and terminals. Do not substitute GS-18TO, GS-18MO or another GS-18 variant solely because its headline rating matches. Inspect the drive end, housing, terminal cover, ventilation path and markings before testing. Related products are available under Generators & Starter-Generators.

Product Type: Aircraft DC starter-generator
Part Number: GS-18TP
Original Cyrillic Designation: ГС-18ТП
Primary Functions: Engine starting and onboard DC power generation
Documented Aircraft Context: Mi-8 family and Tu-22 equipment descriptions; exact execution requires confirmation
Generator Voltage: 28.5 V DC
Generator Current: 600 A
Generator Power Class: 18 kW
Generator Speed: Approximately 4,200–9,000 rpm in the reviewed family data
Generator Duty: Continuous
Starter Supply: 30 V DC in the reviewed family data
Starter Current: Up to 600 A in the documented cycle
Starter Output-Shaft Speed: Approximately 2,400 rpm within the documented tolerance
Starter Duty: Intermittent; follow the approved engine-start sequence
Cooling: Forced-air cooling; connection and airflow depend on the installation
Alternative Designations: GS-18TP; GS18TP; GS 18TP; ГС-18ТП; ГС18ТП
Not Automatically Interchangeable With: GS-18TO, GS-18MO or other GS-18 executions
Compatibility: Confirm aircraft, engine, series, drive, rotation, cooling and terminals
Documentation: Product passport and approved aircraft electrical/engine maintenance documentation

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