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ВОЗМОЖНЫЕ РЕГУЛИРОВКИ СИСТЕМЫ В ПРОЦЕССЕ ЭКСПЛУАТАЦИИТаблица 9.1.
and increase of power setting would happen only if MR RPM is changed (increased or decreased) by MR RPM governor.
This time lag in controlling processes cause bigger MR RPM spikes and drops. However the corrector (27), reduces the fuel supply allowed by MR RPM governor (28) simultaneously with MR collective pitch change, so the signal to reduce fuel supply is transmitted into the system earlier, than MR RPM increase happens. In case of MR RPM increase MR RPM governors (28) likewise increase fuel supply before MR RPM drop. So the incorporation of MR RPM governors reduces dynamic changes of MR RPM. Power synchronizer (33) incorporation may cause uncontrollable increase of MR RPM. For example if kinematic connection of power synchronizer and MR RPM governor (28), MR RPM governor allows the increase of fuel supply so that failed engine develops maximum power limited by БАРК electronic governor. Serviceable engine due to the functioning of power synchronizer (33) would also increase power setting. If MR collective pitch remains the same, then MR RPM increase over allowed limit. MR RPM governors (28) are unable to decrease fuel supply to the engines, since one failed and another is disabled by power synchronizer (33). To prevent this a slide valve (31) was introduced to disconnect power synchronizer. If MR RPM reach nMR=(107±2)% the slide valve (31) in fuel control of serviceable engine disconnects power synchronizer, and then MR RPM governor with intact drive reduces engine power setting to idle, while another engine still runs at maximum power. In case power synchronizer was disabled, engines are controlled by means of collective stick. In this case MR RPM are maintained stable within the range of (95±2)% by the governor of serviceable engine. The failed engine should be transferred to lower power setting manually. If single engine failure happens with set angles of engine control levers for the current power setting α>75%, free turbine RPM slightly decrease because MR collective pitch remains the same. This makes MR RPM governor valve close and because of this operating engine develops takeoff power.
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