(2) The engine control throttle levers are located on middle isle. Automatic operation of the engine is the controlled by thrust control unit VSUT-85 (Thrust Control Computer).
To avoid the possibility of a kickback there is the throttle brake.
When VSUT is switched ON with throttles blocked on IM#2 displayed "UNBLOCK THROTTLE".
On the throttle lever there is inbuilt devices which disable VSUT by applying 1.5 - 2 kg force to the handle.
Buttons are located on the throttle manually activate high thrust (
PR), see Fig. 8.1.10.
Modes of operation of the engine and the corresponding throttle position are shown in Table 8.1.1.
8.1.1.2 The system of reverse thrust
(1) Reverse device and its control units mounted on the engine and are designed for reverse thrust.
Return (negative) thrust is created by changing the air flow direction
by opening or closig the flaps of reversing device. Flaps can be set
in one of two positions: DIRECT THRUST or BACK THRUST.
Shifting of the flaps is made by hydraulic cylinders, which pistons
are connected to the control lever mechanism.
...
(2) The thrust reverser controlled by pilots with Reverse Control Levers (RCL)mounted on the Throttle Levers (TL).
Before turning on the reverser, throttle is moved to IDLE, RCL in the lower
(Off) position is fixed by latch. The reverse thrust value is determined by the RCL up position similarly to TL position when managing direct thrust.
To enable small reverse thrust RCL must be removed from the latch by pressing the RCL lever head down and move lever to the intermediate stop (small reverse).
To enable maximum reverse bring RCL all the way to the "maximum reverse" stop.
(3) Reverse control light signal device is located on the Pilots instrument panel:
- REVERSE LOCK is yellow;
- REVERSE ON is green.
In addition, information on operation is on the IM#2, in the frame
ENG / SIGN (ENG MAIN, ENG GEN):
- When reverse lock is open - LOCK (yellow);
- When the reverse is ON - REV (green).