MAINTENANCE PRACTICES
61-00-15
Page 6-50
Rev. 24 Dec/20
Propeller Owner's Manual
115N
3 Turning the low pitch stop into the cylinder will
increase blade pitch and reduce RPM, and
turning the low pitch stop out of the cylinder
will lower blade pitch and increase RPM. The
low pitch stop has 20 threads per inch. Refer to
Figure 6-11.
a Turning the low pitch stop 2/3 of a turn
equals 0.030 inch (0.76 mm) of linear
travel, and will change the blade pitch by
approximately one degree. One degree of
blade pitch will change the engine RPM by
approximately 140-150 RPM.
b Turning the low pitch stop screw one full turn
equals 0.050 inch (1.27 mm) of linear travel,
and results in approximately 1.7 degree
blade angle change. A 1.7 degree blade
angle change results in an RPM increase/
decrease of approximately 250 RPM.
4 Using a clean cloth moistened with MEK CM106
or MPK CM219, carefully remove any sealant
from the exposed threads of the low pitch stop.
WARNING:
A MINIMUM OF FIVE THREADS
IN THE CYLINDER MUST
ENGAGE THE LOW PITCH
STOP AFTER ADJUSTMENT IS
COMPLETED.
5 When the low pitch stop is adjusted, apply
threadlocker CM21 to the threads of the jam nut.
6 Torque the low pitch stop jam nut in accordance
with Torque Table 3-2.
7 Install a B-7589 set screw in one of the four
threaded holes in the top of the cylinder. Refer to
Figure 6-11.
a The top of the set screw must be below the
surface of the hex nut.
8 Safety the hex nut and the set screw in
accordance with military standard MS33540
using 0.032 inch (0.81 mm) stainless steel safety
wire unless specified differently.