MD Helicopters 369 Series, Manual

Page: 51 / 110

CSP−HMI−2
MD Helicopters, Inc
.
MAINTENANCE MANUAL
18−20−00
Page 205
Revision 39
Table 201. Tail Rotor Balance Weight − Value Chart
At Blade Tip (4) At Blade Pitch Arm (3)
Screw (5) Washer (1)(2)
Part Number
Length
(in./mm)
Weight
(Grams)
Part Number
Thickness
(in./mm)
Weight
(Grams)
OD
(in./mm)
NAS1352 − 08 − 12P 0.75/19.05 2.22 HS306 − 227L 0.016/0.4064 1.17 0.800/20.32
NAS1352 − 08 − 14P 0.875/22.23 2.44
Weight
Thickness
(In./mm)
Weight
(Grams)
369A1622 − 3 0.016/0.4064 0.29
369A1622 − 5 0.036/0.9144 1.76
NOTES:
(1) Used on balance bolt.
(2) Maximum of 23 washers is permitted on each balance bolt.
(3) Minimum of two threads must extend past nut securing balance washers on balance bolt.
(4) Maximum weight, including screws, is 34 grams.
(5) Minimum screw thread engagement is 5/16 inch (7.9375 mm).
G18−2001
TOTAL
WEIGHT
VECTOR
WEIGHT
EQUAL
WEIGHT
TOTAL
WEIGHT
VECTOR
TOTAL
WEIGHT
VECTOR
EQUAL
WEIGHT
SMALLER
WEIGHT
LARGE WEIGHT
OR OR
NOTE:
IF, WHEN ADDING WEIGHTS, OUT−OF−BALANCE VIBRATION
LEVEL INCREASES, ADD WEIGHTS TO THE TOP BLADE(S).
Figure 202. Short Method Tail Rotor Balancing (Four − Bladed Tail Rotor)