Eagle ICA-D212-725, Инструкция по эксплуатации

Страница: 562 / 729

ICA-D212-725 (76)
Page 3 of 21
CHAPTER 76 – ENGINE CONTROLS (76-00-00)

COPYRIGHT

2007 BY DART AEROSPACE LTD.

THIS DOCUMENT IS PRIVATE AND CONFIDENTIAL AND IS SUPPLIED ON THE EXPRESS CONDITION THAT IT IS NOT TO BE USED FOR ANY PURPOSE OR COPIED OR COMMUNICATED TO ANY
OTHER PERSON WITHOUT WRITTEN PERMISSION FROM DART AEROSPACE LTD.
Revision:
0
Date: 07.05.31
76.1 ENGINE CONTROLS
76.1.1 Engine Controls
The engine controls consist of the droop
compensator controls and the power lever
controls. The linkage in the droop compensator
system operates from a bellcrank of the collective
pitch system. The power lever controls are
operated from a twist grip on the collective stick.
76.2 DROOP COMPENSATOR CONTROLS
76.2.1 Droop Compensator Controls
Engine power turbine speed (N2 rpm) is
controlled through the overspeed governor by
means of a linear actuator and a droop
compensator cambox control. The droop
compensator linkage consists of tube assemblies,
torque tube, mount assemblies, cambox
assembly, and linear actuator. A GOV RPM
INCR/DECR switch on the pilots collective pitch
control stick electrically operates the linear
actuator. The actuator moves an engine fuel
control lever (governor shaft) to change settings
of the power turbine rpm. The droop
compensator installation stabilizes rpm as power
plant load fluctuates with changes in main rotor
pitch.
NOTE
Bellcrank (6, Figure 76-1) is attached to
torque tube (4) by means of a shear pin (7),
which is designed to shear to allow
unhindered operation of the collective pitch
controls if the compensator linkage should
malfunction.
76.2.1.1 Rigging – Droop Compensator
Controls
76.2.1.1.1
Ensure that the collective pitch
control system is fully rigged.
76.2.1.1.2
Complete the droop compensator
installation less the following items or
connections:
76.2.1.1.2.1
Control lever (16, Figure 76-1).
76.2.1.1.2.2 Hardware
connecting actuator
(15) to control lever (16).
76.2.1.1.2.3
Hardware connecting bellcrank
of cambox (14) to adjustable control tube (12).
76.2.1.1.3
Set bellcrank of cambox (14) to
center of slot within 0.06 inch (1.52 mm) as
follows: (Refer to detail C, Figure 76-2).
76.2.1.1.3.1 Loosen nut to allow free
movement of lockwasher.
76.2.1.1.3.2
Center bellcrank adjustment bolt
in slot.
76.2.1.1.4
Using the adjustment screw or
screws (detail A, Figure 76-2) of linear actuator
adjust the stroke length as follows:
76.2.1.1.4.1 Electrically position actuator
shaft to approximately midpoint of stroke, by
operating GOV RPM switch on collective control
lever.
76.2.1.1.4.2
If actuator with two adjusting
screws is installed, turn both positive stop
adjusting screws to obtain maximum stroke.
(Refer to detail A.) Reduce stroke by turning
each screw ten full turns away from maximum
adjustment to obtain actuator nominal position.
76.2.1.1.4.3
If actuator with single adjusting
screw is installed, it is not necessary to adjust
positive stop screw to obtain nominal position.
Positive stops can be adjusted, if necessary, for
travel of 0.50 to 1.75 inch (1.27 to 44.45 mm)
without change in nominal position.
NOTE
One full turn of the adjusting
screw will cause a change in both
the retract and extend position of
0.032 inch. (Refer to detail A.)