INSPECTION AND CHECK
61-00-39
Page 5-23
Rev. 17 Apr/20
Propeller Owner’s Manual
139
D. Blade Track
(1) On -2 and -5 propeller models only, check the blade
track as follows:
(a) Chock the aircraft wheels securely.
(b) Refer to Figure 5-1. Place a fixed reference point
beneath the propeller, within 0.25 inch (6.4 mm) of
the lowest point of the propeller arc.
NOTE
: This reference point may be a flat board
with a sheet of paper attached to it. The
board may then be blocked up to within
0.25 inch (6.4 mm) of the propeller arc.
(c) Rotate the propeller by hand in the direction of
normal rotation until a blade points directly at the
paper. Mark the position of the blade tip in relation to
the paper.
(d) Repeat this procedure with the remaining blades.
(e) Tracking tolerance is ±0.062 inch (1.57 mm) or 0.125
inch (3.17 mm) total.
(2) On -3 and -7 propeller models only, the propeller must
be removed from the aircraft to check the blade track
on a rotatable fixture, in accordance with the applicable
Hartzell Propeller Inc. Manual 118F (61-10-18) or
132A (61-10-32).
(3) Possible Correction
(a) Remove any foreign matter from the propeller
mounting flange.
(b) If no foreign matter is present, refer to an
appropriately licensed propeller repair facility.
