BPS-47 Series 4

BPS-47 Series 4 anti-surge system unit

BPS-47 Series 4 is the Latin catalogue form of the БПС-47 series 4 block. Aviation equipment catalogues and component listings identify the BPS-47 family as an anti-surge system unit. Its function belongs to aircraft engine protection: the system detects or responds to conditions associated with compressor instability and coordinates the corresponding control action.

BPS-47 Series 4 system purpose

A compressor stall or surge can disrupt airflow through a gas-turbine engine. The documented BPS-47 protection chain includes the BPS electronic block, a surge sensor, KRPS command equipment and an AOT fuel-cutoff actuator. The block coordinates the protective response; it is neither the sensor nor the complete protection system on its own.

Documented MiG-23 context

Maintenance records explicitly mention BPS-47 and KRPS-55 equipment on MiG-23M aircraft, while technical discussion of the MiG-23 anti-surge system describes repeated short fuel interruptions and protective-start logic before restoration of the previous engine mode. This supports the MiG-23 family context, but it does not identify every aircraft modification or prove that the cited aircraft used Series 4 rather than another BPS-47 execution.

Series identification

Series 4 must remain in the designation. BPS-47 Series 4 and Series 5 may share a family name yet differ in circuits, connector pinout, settings or supported system execution. They are presented as related products for navigation, not as substitutes. Selection requires the exact Cyrillic plate, series, drawing number, connectors and the parts catalogue for the aircraft and engine concerned.

Inspection and ordering

Inspect the enclosure, mounting points, connector contacts, seals and plate before testing. Use only the approved bench procedure and known interfaces. An enquiry should include photographs of all markings, the installed engine or aircraft reference, quantity, condition and required passport or acceptance documents. Other related blocks can be found in Electronic Control Units.

Product Type: Anti-surge system electronic unit
Documented Function: Part of an aircraft gas-turbine engine anti-surge protection chain
System Scope: Works with associated sensors, wiring and executive equipment
Associated Units: Surge sensor, KRPS command equipment and AOT fuel-cutoff actuator in the documented protection chain
Documented Aircraft Family: MiG-23; exact Series 4 effectivity must be checked
Recorded Maintenance Context: BPS-47 and KRPS-55 equipment documented on MiG-23M aircraft
Protective Response: Coordinated fuel interruption and protective-start logic according to the applicable system description
Primary Designation: BPS-47 Series 4
Original Cyrillic Designation: БПС-47 серии 4
Alternative Designations: BPS-47 Series 4; BPS-47 4 Series; BPS47-4; БПС-47 серия 4; БПС47-4
Series Requirement: Series 4 is part of the product identity
Interchangeability: Not established with Series 5 or other BPS units
Selection Basis: Nameplate, series, drawing, connectors and approved engine-system documents

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