SU-27 CHECK LISTS
The powerplant of the Su-27 includes two АЛ-31Ф (AL-31F) engines, each of which has its own
turbine starter ГТДЭ-117 (GTDE-117). Because both engine have a separate starter, both individual
and simultaneous starting of both engines is possible.
Engine Ground Start
In order to start the engines on the ground, one should:
• Turn on electric power [RShift – L]
• Set the engine throttle to the IDLE stop
• Press [RAlt + Home] to start the left engine and [RCtrl + Home] to start the right
engine
After this, the engine starter doors will open, the door limit switch actuates and puts the starter
circuit into operation. Based on the starter circuit command, fuel is provided to the turbine starter
and the annunciator "ЗАПУСК" (START) is lit in the cockpit.
The starter circuit turns on the electrical starter motor, ignites the turbine starter, and supplies
oxygen to the turbine starter. After ten seconds, the turbine starter will turn off these accessories
and simultaneously starts ignition of the main chamber. The turbine starter spins up the engine
compressor and the fuel control unit controls fuel flow to the main chamber. After ignition in the
main chamber, the turbine comes into operation and accelerates the engine compressor together
with the turbine starter. At 35% of the engine RPM, the ignition exciter in the main chamber switches
off. At 53% of the engine RPM, or after 50 seconds, the turbine starter and starter circuit are
switched off, which is indicated by the annunciator "ЗАПУСК" (START) turning off. The engine then
reaches IDLE mode automatically.
Engine Shutdown
Engine shutdown is performed by placing the engine throttle to IDLE stop and then pressing the keys
[RAlt + End] (for the left engine) and [RCtrl + End] (for the right engine).
In Flight Engine Restart
Restarting an engine while in flight is performed by placing the throttle from the "СТОП" (STOP)
position to any non-afterburning position (with the landing gear retracted only). At the same time, a
micro-switch connected to the throttle turns on the starter circuit, which turns on the following
accessories for 20 seconds: ignition exciter of the main chamber, the booster pump, oxygen supply to
the engine, and the annunciator "ЗАПУСК" (START).
There is no need to use the turbine starter due to engine autorotation.
Thus, to start the engine in flight it is necessary to place the engine throttle to the IDLE and then to
the "СТОП" (STOP) position by pressing the keys [RAlt + End] (for the left engine) and [RCtrl +
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