TM 55-2840-231-23
6-6. Gas Producer Fuel Control - Idle Check - Continued
AIRFRAME/-Continued
If N1 idle speed did not change, very slowly
roll the twist grip to index mark in the
direction of increased power. No increase in
N1 speed is permitted before fuel control
pointer indicates 30 degrees as indicated on
twist grip index mark.
An increase in speed before the pointer
reaches 30 degrees indicates the fuel control
internal rigging is incorrect; replace the fuel
control. An increase at or above the 30
degree mark is normal.
Using wrench 6798292, turn screw clockwise
to increase or counterclockwise to decrease
N 1 speed. A 1/8 turn adjustment changes
engine speed approximate y 5%. If N 1 speed
does not respond to the idle speed screw
adjustment, the rigging is establishing idle
speed. Rerig as required. If N 1 speed does
respond to the idle speed screw, make the
62-65% (in the OH-6A), or 62-64% (in the
OH-58A) N1 speed setting.
NOTE
Engine performance check is not
required for idle speed adjustment if
rigging adjustment was not
performed. Following any rigging
adjustments, perform the idle speed
check.
When the rigging is
correct, change idle speed
adjustment screws to
obtain a 62-65% N1 speed
setting (in the OH-6A
helicopter) or 62-64% N1
speed setting (in the
OH-58A helicopter) with
generator switch off. (See
figure for location of fuel
control adjustment ).
Adjust to 63% N1 speed
setting to allow for
seasonal changes.
Change 11
6-8.1
