9-7A. Installation Of (Optional) Nacelle Fuel Cell. (Pa-31-325 Only) (Refer To Figure; Checking Fuel Quantity Gauges - Piper Navajo PA-31 Service Manual

PIPER NAVAJO SERVICE MANUAL
9-7a. INSTALLATION OF (OPTIONAL) NACELLE FUEL CELL. (PA-31-325 only) (Refer to Figure
9-1d.)
a. Inspect the cell compartment as explained in Paragraph 9-4b.
b.
Should the cell be in its shipping container, do not remove until ready for installation.
c.
Check to be sure the cell is warm enough to flex. Do not use sharp tools such as screwdrivers, files,
etc., for installation purposes.
d.
Place tape or another protective material over the edges of the access opening to prevent damage
to the cell.
e. Roll the cell into the shape and size which can be inserted through the access opening of the cell
compartment.
f.
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.
g.
Connect the fuel drain valve in the wheel well below the cell, the fuel outlet at the forward inboard
end of the fuel cell and the vent line at the forward outboard end of the fuel cell.
h. Wipe the inside of the cell clean of all dirt and foreign material with a clean, soft, lint-free tack
cloth and inspect for cleanliness.
i. Install the fuel cap adapter bracket by wrapping the bracket with a protective cover so as not to
damage the cell; insert it through the access opening and slide it in position. Install the gasket between the
bracket and cell and start the cap bolts that attach the bracket to the cell. Align the holes in the adapter with
the holes in the skin bracket and torque cap bolts to 35 ± 5 inch-pounds.
j. Position the cap adapter and gaskets; one gasket on each side of the skin bracket, with the at-
tachment holes in the skin bracket and adapter bracket. Install machine screws and secure.
k. Install fuel senders, gaskets; one on each side of bracket and screws. Tighten nylon screws to 5 + 2,
-0 inch-pounds.
1. Connect sender wires and ascertain that insulator sleeve is insulating to point where wire attaches
sender. Install sender access plates.
m. Install the remaining cell cover plates on top of the nacelle. Torque cell cover cap bolts to 35 ± 5
inch-pounds.
n. Put enough fuel in cell to check fitting leaks.
o.
Install remaining access plates.
9-8. CHECKING FUEL QUANTITY GAUGES.
a.
Completely drain the inboard and outboard fuel cells that relate to the gauge that is to be
checked. (Refer to Draining Fuel Cells, Section II.)
b. Level the airplane longitudinally and laterally.
c.
Ascertain that the crossfeed and emergency shutoff valves are closed.
NOTE
The electrical system must supply 28-volts to the gauge to make
this check.
Revised: 3/11/81
FUEL SYSTEM
3B1