Installation Of Wing Fuel Cell - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
e. Torque the hose clamp to 40 to 45 inch pounds. Do this once. Do not re-tighten unless the hose
clamp is loosened completely and allowed to set for 15 minutes before retightening.
CAUTION
For aircraft using new BTC-85 Const fuel cells (Piper Part Numbers,
71028-2, 71028-3 and 71027-2, 71027-3) must use the following
torques on hose clamps.
1. Outlet hoses = 15 to 20 inch pounds.
2. Drain hoses = 12 to 16 inch pounds.
3. Vent hoses = 12 to 16 inch pounds.
f. Do not use sealing paste or gasket compound.
g. Apply a thin film of Simonize Wax to metal flow tubes to facilitate installation and removal.
9-10. INSTALLATION OF WING FUEL CELL. (Refer to Figures 9-2 and 9-3.)
a.
Inspect the cell compartment as explained in Paragraph 9-8.
b. Install two 4 inch strips (side by side) of Ludlow two sided adhesive transfer tape No. 7322, Piper
part number 189 704, to the fuel liner at a point directly beneath the location of the fuel indicator sender
unit float in "empty" position. Leave the backing on the tape to prevent adherence to the cell until the cell
is properly positioned.
c.
Should the cell be in its shipping container, do not remove until ready for installation.
d.
Check to be sure that the cell is warm enough to flex. Do not use sharp tools such as
screwdrivers, files, etc., for installation purposes.
e.
Place tape or another protective material over the edges of the elongated access opening to
prevent damage to the cell.
f.
Roll the cell into the shape and size which can be inserted through the access opening of the cell
compartment.
g.
Unroll the cell and establish correct relationship of the cell to the compartment. Insure bottom
of fuel cell is smoothed out and free of wrinkles.
h.
Remove the backing from the tape installed in Step b. Press the cell to the exposed tape on the
cell.
i. Lay out the nylon cord (furnished with fuel cell) on the wing to determine the length of cord for
each tie. The cords are routed as shown in Figures 9-2 or 9-3. Allow enough extra cord to work with.
j. Double tie a washer (AN960416) securely to the ends of each cord. Reach through the access
openings and start the cord through the spar bushing at each end of the cell compartment.
k.
From each end of the cell, feed the cord through the cell hangers and rib bushings until the cords
can be joined at the access opening. Do not tie cords yet.
1.
Connect the fuel drain valve plate by inserting the threaded end of bolt or rod, not under three
inches long, up through the plate and nipple fitting of the fuel cell. (Refer to Figure 9-4.) Reach through
the fuel cell opening and install a two to two and one-half inch diameter washer on the bolt or rod and
secure with a nut. Pull the nipple down through the opening in the wing panel enough to clamp the nipple
fitting to the plate. Remove the bolt or rod, secure plate to wing panel and install drain valve.
m.
Connect the fuel outlet with finger strainer and vent tube to the molded nipple fittings and
secure. (Refer to Paragraph 9-9.)
NOTE
The nylon cord used to hold the fuel cells is .125 diameter with a
minimum breaking strength of 550 pounds and conforming to MIL-
C-5040C type III specifications. Obtain through Goodyear.
Revised: 3/11/81
FUEL SYSTEM
2K11