TM 55-1520-240-23-4
5-82.1
ADJUST BLADE BALANCE WEIGHTS
(Continued)
5-82.1
3.
Find span balance weight correction for major
trailing edge repair (Task 5-72) as follows:
a.
Measure distance in inches from blade tip to
center of trailing edge repair.
b.
Subtract the distance in step a from 360.
The difference is the blade station. Record
blade station.
c.
Measure the length of the repair in inches.
Record repair length.
d.
Determine balance weight adjustment from
chart 3 as follows:
(1)
At bottom of chart 3, find blade station
recorded in step b.
(2)
Go up blade station line to intersection
with repair length recorded in step c.
(3)
From intersection of blade station and
repair length lines, move across to left
edge of chart. Find inches of weight to
shift from aft to forward fitting. Record
weight adjustment required.
(4)
From intersection of blade station and
repair length lines, move across to right
edge of chart. Find inches of weight to
remove from aft fitting. Record weight
adjustment required.
NOTE
Example shows a 12 inch trailing
edge repair centered at blade station
225. This repair would require weight
adjustments as follows:
(a)
From left edge of chart, shift 0.325
inch of weight from aft tube to forward
fitting.
(b)
From right edge of chart, remove
0.174 inch of weight from aft fitting.
e.
Adjust balance weights. Go to step 7.
5-500
