BSG

BSG monitoring of the correction channel

The unit is commonly associated with monitoring the tracking system of the airspeed corrector / setter equipment. The BSG receives an AC mismatch signal from the connected corrector channel and checks whether this signal remains within the permitted limits. When the mismatch is small enough, the system is considered to be in the required neutral or zeroed condition. If the mismatch exceeds the allowed value, the unit removes the ready output. This logic is useful in autopilot and navigation-related systems where incorrect correction data must not be accepted as normal.

Readiness signal generated by the BSG

During normal operation, the BSG produces a DC readiness signal for the connected aircraft control system. This output is usually treated by the system as confirmation that the monitored channel is serviceable and ready for further operation. If the controlled circuit fails, the block removes this signal and allows the aircraft warning or control logic to react. The crew may see this as a failure indication, depending on the aircraft equipment layout. The important point is that the BSG does not control the aircraft by itself; it supervises a signal condition and confirms or rejects readiness.

BSG failure logic and zeroing mode

The BSG is especially relevant in zeroing and correction modes. The unit can issue a ready signal when output and control signals are absent at the same time, or when a control command is applied and the input signal remains within the required operating range. In failure conditions, the block removes the readiness output at defined threshold levels. This prevents the connected system from continuing to operate as if the correction channel were still valid. Such logic is typical for older aircraft automatic control systems where signal supervision is built from dedicated electromechanical and electronic units.

Aircraft systems using the BSG

The BSG is used with navigation and automatic control equipment installed on civil and military aircraft and helicopters. It may be found in systems associated with AP-34B autopilots, Kurs MP-2 / MP-70 equipment and SVS-PN air data / navigation-related systems, depending on aircraft type. Typical aircraft applications include An-24, An-26, Il-18, Mi-26 and other platforms with compatible equipment. Since the same designation may appear in different system contexts, the exact aircraft, system version and wiring documentation should be checked before replacement.

Installation, checks and supply of the BSG

For maintenance, the BSG is checked through its power supply, input mismatch signal, control input and readiness output. A correct bench or aircraft test normally confirms whether the block removes the ready signal at the specified thresholds and restores it under normal conditions. For procurement, the decimal number EU2.390.260 should be specified when applicable. It is also important to clarify the required acceptance category, documentation, condition and whether the block is intended for a specific aircraft system such as AP-34B, Kurs MP-70 or SVS-PN.