TM 1-1520-238-10
2-30
BAT OVRD
PWR
PILOT PWR LEVER QUADRANT
AND
EMER PWR CHK OVSP TEST PANEL
CPG PWR LEVER QUADRANT
M01-017
Figure 2-19.
Pilot Emergency Check Overspeed Test Panel Power Lever Quadrant and CPG Power Lever
Quadrant
2.31 ENGINE CONTROL SYSTEM.
The engine control system consists of the engine power
lever quadrant, the engine chop controls, the load de-
mand system, and the overspeed protection system.
2.31.1 Engine Power (PWR) Lever Quadrants.
The
PWR lever quadrants for the pilot and CPG (fig 2-19) al-
low either crewmember to manage engine power. The two
quadrant control panels are different, although the PWR
levers are identical. Friction however, can be set on only
the pilot levers. The PWR levers have four detent posi-
tions: OFF, IDLE, FLY and LOCKOUT. The pilot detent
override controls are mechanical while the CPG’s are
electrically operated. Movement of either PWR lever
moves a cable to mechanically shut off fuel (stop cock) or
to set NG speed. For flight, the lever is advanced to FLY.
By moving the PWR lever momentarily to LOCKOUT,
then retarding past FLY, NG speed may be manually con-
trolled. When the PWR lever is in LOCKOUT, the TGT lim-
iting system is deactivated, and TGT must be closely
monitored and controlled. The overspeed protection sys-
tem is not disabled in the LOCKOUT position.
CAUTION
Physically confirm that engine chop col-
lar is seated in its latched/centered posi-
tion.
2.31.2 Pilot and CPG Engine Chop Control.
The
position of a knurled ring on each collective stick grip con-
trols engine chop. The ring is placarded UNLATCH,
CHOP and RESET. When the ring is pushed forward (UN-
LATCH) and rotated 45 to the right to CHOP, the speed of
both engines is reduced to idle. This is done by a switch in
the grips that cuts out the power turbine speed reference
signals for both engines. At this time, the ENGINE CHOP
warning light will illuminate. The ENG 1 OUT and ENG 2
OUT lights and audio will not activate because engine
chop activation disables this feature. The LOW RPM RO-
TOR
