BS4-05

Function of BS4-05

The main function of BS4-05 is matching and conversion of information signals that carry angular position data. These signals are received from SKT sine-cosine transformer sensors and prepared for further transmission to onboard systems. Depending on aircraft configuration, the receiving systems may include flight-navigation equipment, automatic control systems or flight data acquisition / monitoring equipment. Correct operation of the module is important where angular position signals must be transferred with stable scaling, phase coordination and low conversion error.

Operation with SKT sine-cosine transformer signals

BS4-05 works with electrical signals generated by SKT-type sine-cosine transformers. These sensors are used to transmit angular position information in aircraft equipment. The module processes sinusoidal and cosinusoidal components and coordinates them for use by connected avionics or control circuits. According to the supplied context, the input signal frequency is 400 Hz, which corresponds to the standard aircraft AC network frequency used in many onboard systems. Exact circuit levels and connector pinout should be confirmed through original documentation.

Application on Mi-26 and related equipment

The BS4-05 module is referenced in the context of Mi-26 helicopter onboard equipment and repair documentation. It may be used as part of systems requiring accurate transformation or matching of angular-position signals. The module is also mentioned together with related aviation matching blocks such as BS2-01 and BS4-04, as well as automatic control system modules. Since actual installations may differ by helicopter configuration, equipment version and maintenance documentation, applicability should be confirmed through the aircraft equipment list and technical documentation.

Technical documentation and maintenance

The module is associated with technical specifications TU 8I3.048.008TU and drawing / part number 8I3.048.008. Full engineering data, including connector pinout, bench-test procedure, exact conversion tolerances and control-point values, should be taken from the original operating and maintenance documentation. During inspection, the module should be checked together with SKT sensor lines, connectors, wiring harnesses, receiving avionics units and any related automatic control or recording equipment. Test records and passport data are important for acceptance.

Identification and ordering of BS4-05

Before ordering BS4-05, the aircraft type, system application, required quantity, condition category and documentation requirements should be confirmed. The customer should also clarify whether only the BS4-05 module is required or whether related modules such as BS2-01 or BS4-04 are also needed. The item may be supplied for repair stock, scheduled maintenance, replacement of a defective matching module or restoration of Mi-26 onboard electronic systems. Passport, form record, acceptance stamp and test documentation should be agreed before shipment.