Piper Navajo PA-31 Service Manual page 151

VIEW A
AILERON P/N 40200-00 -01,-37
156 A
PIPER NAVAJO SERVICE MANUAL
155
MASTER TEST WEIGHT ARM
MASTER TEST WEIGHT ARM (6 INCHES)
CL HINGE
VIEW B
AILERON P/N 40200-42, 43
TAPE TRIM TAB
LEVEL WITH AILERON
BALANCE LINE
I
Figure 4-15. Aileron Balancing
a. Remove the aileron from the aircraft and place it in a horizontal position on a balancingjig. (Refer to
Paragraphs 4-15, 4-85, 4-86 and Figure 4-15, View B.)
b. If the surface balances, it is at the minimum balance limit and is satisfactory.
c. If the surface is leading edge heavy, place the master test weight 6 inches behind the hinge line. If the
surface balances or is trailing edge heavy, it is satisfactory. If the surface is still leading edge heavy, remove
material from the surface balance weight until a balanced condition is obtained with master test weight in
place.
d. If the surface is trailing edge heavy, add trim weights as specified in Table IV-I. to balance the sur-
face. This should result in the minimum balance limits and is satisfactory. Should the aileron still not come into
specified limits the following procedure may be used:
1. LEFT AILERON
(a) Obtain a main balance weight P/N 54325-2 and machine off the sides (approx. equal
amounts) until 4.1 pounds is obtained.
(b) Install this modified main balance weight in place of the existing weight and secure with
appropriate hardware.
(c) Proceed to rebalance the aileron in accordance with Steps a. b and c, do not use more than
four (4) trim weights P/ N 54395-2.
(d) The total balance weight, trim weights and hardware must not exceed 4.8 pounds for the
left aileron.
Revised: 1/29/82
STRUCTURES
1G7