Molded Nipple Fittings; Installation Of Inboard, Aft Inboard, And Outboard Fuel Cells - Piper Cheyenne IIIA Airplane Maintenance Manual

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Storage (continued)
8. Molded Nipple Fittings
For best service from this type fitting, exercise the following precautions at time of installation.
(a) Apply thin film of Simonize Wax to metal tubes to facilitate installation and removal.
(b) Insert fuel lines into each nipple until end is flush with inside edge of cell.
(c) Ensure hose clamps clear end of fitting by 0.25 inch, where possible.
(d) Torque hose clamps once. Do not retighten unless hose clamp is loosened completely and
allowed to set for 15 minutes before retightening.
(e) Do not use sealing paste or gasket compound.
9. Installation of Inboard, Aft-Inboard, and Outboard Fuel Cells (refer to 28-10-00 Figures 402, 403,
and 404)
(a) Inspect cell compartment.
(b) Do not remove cell from shipping container until ready for installation.
(c) Ensure cell is warm enough to flex. Do not use sharp tools such as screwdrivers, files, etc, for
installation purposes.
(d) Place tape or protective material over edges of elongated access opening to prevent damage
to cell.
(e) Roll cell into proper shape and size to insert through access opening cell.
(f) After fitting cell into wing, unroll cell and establish proper sizing of cell to fit compartment.
(g) From each end of cell compartment, feed cord through cell hangers and rib bushings until
cords can be joined at access openings. Do not tie cord but route as shown in 28-10-00
Figures 402, 403, and 404.
NOTE: The nylon cord holding fuel cells has a 0.125 inch diameter with a minimum breaking
strength of 550 pounds and conforms to MIL-T-5040C, Type III specifications.
(h) Connect fuel drain plate by inserting threaded end of bolt or rod (not under three inches long)
up through plate and nipple fitting of fuel cell (refer to 28-10-00 Figure 405). Reach through
fuel cell opening and install 2 or 2 1/2 inch diameter washer on bolt or rod; secure with nut.
Pull nipple down through opening in wing panel enough to clamp nipple fitting to plate.
(i) Remove bolt or rod. Secure plate to wing panel and install drain valve.
(j) On inboard main cell, install submerged fuel pump through access opening in wing top. Secure
to inboard rib with four bolts attaching pump.
(k) Connect electrical wires to inboard cell, check valve on submerged fuel pump, and connect fuel
lines to check valve.
(I) Install fuel cell flange mounting brackets in elongated access holes with screws.
EFFECTIVITY:
PAGE
10
040-999
Jan
10/90
28-10-00