TM 55-2840-241-23
N O T
E
Make rigging adjustments using the pilot's twist
grip. If the copilot's collective is installed recheck
the linkage movement using the copilots twist
grip. The pointer in IDLE position. using the cop-
ilots twist grip. must be within 5 64 inch of the 30
position from within the full open or full closed
position and idle speed must be no lower than idle
speed obtained using the pilot’s twist grip.
NOTE
Dual control installation requires an idle speed
check from the copilot's side also. Idle speed must
repeat every time.
N O T
E
Perform the entire idle speed check whenever fuel
control rigging or idle speed is adjusted.
e. Idle Speed Check. Roll twist grip to full open posi-
tion then to idle detent, Mark (pencil) the precise posi-
tion of pointer tip on the fuel control quadrant with twist
grip in IDLE position. Release the idle detent on twist
grip. Very slowly roll twist grip in direction of cut off just
enough to obtain perceptible movement of pointer tip
(approximately the width of the pencil mark). Index the
twist grip at this position. Very slowly roll the twist grip
in the direction of increased power from IDLE position
just enough to obtain perceptible movement of the
pointer tip (approximately the width of the pencil mark I.
Index the twist grip at this position. Move the pointer to
exactly the 30 degree mark, Index the twist grip at this
position. Start the engine and let N1 stabilize in IDLE
position. Very slowly roll the twist grip to index mark in
direction of cutoff. If N1 idle speed decreases take the
following corrective action.
(1) If the pointer is at or above the 30 degree
mark, rerig aircraft linkage to move pointer tip to a
point just below 30 degree mark.
Figure 5-5. Fuel Control Quadrant and Pointer
5-10
Change 14
