BPS-89P Series 2

BPS-89P Series 2 engine-protection unit

BPS-89P Series 2 is the catalogue form of the БПС-89П series 2 aircraft block. A technical system diagram places BPS-89P in the AL-21F3 engine-control and indication environment together with APD-89FT starting automation, BDK-89 command equipment, PGL-30ML and engine-condition signalling circuits. The exact role must be read within that complete system rather than inferred from the initials alone.

BPS-89P Series 2 system role

The available diagram associates the unit with engine start, afterburner and protective signalling. It belongs to a coordinated control chain and is not an independent sensor or actuator. Compressor-instability protection is the documented functional context of the BPS family, but exact logic, thresholds and outputs for Series 2 must be taken from the applicable AL-21F3 documentation. General background is available under compressor stall.

Cooperating equipment

The confirmed diagram names APD-89FT, BDK-89, PGL-30ML, DTE-1, IA-11 and ITG-1 in the same engine and aircraft signal environment. These are useful cross-reference points for identification and system tracing; they are separate units and are not substitutes for BPS-89P Series 2. The diagram does not by itself establish every aircraft modification on which the block was installed.

Designation and compatibility

The Cyrillic letter П is transliterated as P, so BPS-89P and БПС-89П describe the same designation form. Series 2 or the record form 2S remains part of the identity. Similar BPS-89, BPS-89FT and APD-89FT markings represent different devices. Confirm the nameplate, drawing number, connector keying, engine modification and approved parts catalogue before replacement.

Inspection and ordering

Inspect the enclosure, connectors, mounting, seals and complete nameplate. Bench testing requires the correct engine-system diagram and approved simulation of input signals. The enquiry should state BPS-89P Series 2 / БПС-89П серии 2, aircraft and engine modification, quantity, condition and required documentation. Related protection and control blocks are listed under Electronic Control Units.

Product Type: Aircraft engine anti-surge system unit
Documented Function Context: Engine start, afterburner and protective-control signalling
Documented Engine Context: AL-21F3 system diagram
Cooperating Equipment: APD-89FT, BDK-89, PGL-30ML, DTE-1, IA-11 and ITG-1
Aircraft Applicability: Not established for every modification by the reviewed diagram; verify by parts catalogue
Electrical Ratings: Use the Series 2 passport and approved circuit documentation
Dimensions and Mass: Not confirmed in the reviewed open sources
Primary Designation: BPS-89P Series 2
Original Cyrillic Designation: БПС-89П серии 2
Alternative Designations: BPS-89P Series 2; BPS-89P-2S; BPS89P-2; БПС-89П серия 2; БПС-89П-2С
Interchangeability: Not established with BPS-89, BPS-89FT or other series
Selection Basis: Full plate, series, drawing, connectors, engine and aircraft effectivity

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