Piper Navajo PA-31 Service Manual page 162

PIPER NAVAJO SERVICE MANUAL
4-93. INSTALLATION OF BALANCE WEIGHT ANCHOR NUT. ELEVATORS
P/N 40140-00 and P/N
40140-01. (Refer to Figure 4-27.)
a.
With the elevator tip removed, remove the elevator end rib by the following procedure:
1. Remove rivets (8) that secure the rib (5) to the elevator spar (9) attachment clip (7). Use
minimum drill pressure to avoid bending the clip.
2. Remove rivets (1) that secure the rib (5) to the forward channel (2). Use minimum
drill
pressure to avoid bending the tab of the channel.
3.
Remove all rivets (6) that secure the elevator skin to the end rib.
b.
Locate and drill a hole .250 of an inch in the web of the rib for the installation of the additional
anchor nut (4). The hole shall be .437 of an inch aft from and aligned with the center
of the forward
tooling hole (3).
c.
Position anchor nut (NAS686A3K) in a vertical position and mark attachment holes.
Drill .098
inch holes and dimple to 100 degrees.
d. Secure anchor nut using MS20426AD-3 rivets.
e. Reinstallation of the elevator end rib may be accomplished by the following procedure:
1.
Position the end rib (5) and temporarily secure the skin to the rib with sheet
metal
fasteners.
2.
Fasten, with sheet metal fasteners, the rib at the upper hole of the forward channel (2) and
at the lower hole of the spar clip (8).
3. Enlarge the unfastened attachment holes of the rib, channel and spar clip to .129 of an inch.
4. Insert sheet metal fasteners into enlarged holes and remove fasteners from the undrilled
holes.
5.
Enlarge the upper hole of the spar clip and the lower hole of the forward channel through
the rib to .128 of an inch.
6.
Remove all fasteners and the end rib.
7.
De-burr all enlarged holes.
8.
Position the end rib to the spar and channel of the elevator assembly. Temporarily insert
sheet metal fasteners into the upper hole of the forward channel and lower hole of the
spar clip, and align
holes for riveting.
9. Secure rib with rivets (CR2249-4) at the unfastened holes.
10. Remove fasteners and rivet remaining holes.
11. Secure skin to rib assembly with rivets (MS20426AD3).
Revised: 9/23/80
STRUCTURES
1G18