OPERATION AND INSTALLATION MANUAL
EN-1320
3) Loose Blades
a) Except model AV-844, any movement of the blade is not acceptable.
b) Propeller AV-844 only
1 Except In and Out play, slight movement of the blade within
±
0,5 mm (0.02 inch) is
acceptable, provided that there is no hanging and the blade returns to its original
position when released.
2 Radial play (pitch change) within 0,5° is acceptable.
CAUTION 1: DO NOT APPLY AN EXCESSIVE FORCE TO THE BLADE WHEN
CHECKING THE MOVEMENT. THE FORCE 1 N TO 4 N IS ACCEPTABLE.
CAUTION 2: EXCESSIVE MOVEMENT OF THE BLADE IN THE HUB MAY INDICATE THE
DAMAGE INSIDE THE PROPELLER.
FIGURE 6-2
4) Blade track
NOTE: This inspection procedure only be performed if blade track problem is suspected as
potential source of abnormal propeller operation (e.g. vibration).
NOTE: Shut down the engine with propeller in minimum flight angle.
Check the blade track as follows (figure 6-3):
a) Chock the aircraft wheels securely.
b) Place a flat fixed board with attached sheet of paper under the tip of the lower blade. Use
a pencil to draw a line along the full width of the blade tip.
c) Rotate the propeller manually in the direction of normal rotation and repeat this procedure
with the other blads.
d) The maximum difference of 3,0 mm (0.12 inch) between all blades is acceptable.
61-10-20
INSPECTIONS
Page 6-7
2017-10-06
