TM 55-2840-241-23
(2) If pointer is more than 5/64 in. (2.0 mm) below 30
degree mark, rerig aircraft linkage to move pointer
closer to the 30 degree mark.
(3) 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 degree as indi-
cated on twist grip index mark.
(4) When the rigging is correct, change the idle
speed adjustment screw to obtain a 62-64% N 1 speed
adjustment with generator switch off. Set the idle
speed at approximately 63% N1 to allow for seasonal
temperature changes. (See figure 5-6). Using wrench
6798292, turn the screw counterclockwise to decrease
N1 speed. A 1/8 turn adjustment changes engine speed
approximately 5%. If Nl speed does not respond to the
idle speed screw adjustment, the rigging is establish-
ing idle speed. Rerig is required. If N1 speed does
respond to the idle speed screw, make the 62-64% N1
speed setting. An engine performance check is not
required if the rigging has not been adjusted.
f. Maximum Speed Stop. (See figure 5-6.) Adjust
screw clockwise to increase or counterclockwise to
decrease N1 speed. Do not exceed 105% N1. Check rig-
ging to assure arm contacts max speed stop with twist
grip (both sticks).
N O T
E
Maximum speed stop screw should be turned in
increments of one turn maximum One turn
equals approximately l% N1 speed.
NOTE
If the allowable limit of one of the three main
indicators (torque, temperature or N1 speed) can-
not be reached in flight. readjust the max speed
stop screw. Do not exceed existing torque. tem-
perature or N1 limits.
NOTE
An engine performance check is required after
adjusting maximum speed stop screw (refer to
applicable Aircraft Maintenance Test Flight
Manual). An EPC is required after adjustlng max
speed stop screw or adjustment of fuel control rig-
ging.
Figure 5-6. Gas Producer Fuel Control Adjustments
Change 14
5-10.1
