![background image](http://html.mh-extra.com/html/piper-aircraft-corporation/pa-28-161-cadet/pa-28-161-cadet_maintenance-manual_1558865274.webp)
9-8. FUEL LINES.
9-9. INSPECTION AND TIGHTENING OF FUEL LINE UNION FITTINGS
a. Remove the aft inboard inspection panel from the lower surface of the right and left wing.
b. Remove the pilot's seat and left cabin side panel. Fold back the carpeting that covers the forward side of
the spar box and remove the cover from the fuel line(s).
c. Inspect all union fittings used in the fuel system for signs of leakage. Note any leaking fittings for later re-
check
.d. Using a torque wrench and tubing crow's foot, carefully tighten each union fitting to the torques listed
below:
Tube Size
Applied Torque
I/4 in. O.D.
75-95 inch-pounds
Using a Tubing
3/8 in. O.D.
175-195 inch-pounds
Crow's Foot.
—CAUTION—
Using a crow's foot adapter other than a tubing type will result in
deformation or severe damage to the union nut and will probably cause
a leak which will require replacement of the union and tubing.
—NOTE—
If during the torque check a galled nut and union are suspected, backoff
the nut and inspect the threads. If the union is serviceable, apply a
thread lube such as Slip Spray Lubricant (Dupont) or Ferrulube (Parker-
Hannifin), and torque the nut to the proper values as listed in Step d. If
the union is unserviceable, it must be replaced per instructions given in
paragraph 9-10
When applying thread lubricant insure its application to the male connector threads only. Care should be taken
that no lubricant enters the throat of the connector seat or contacts the ferrule seat face.
e. After torquing each fitting. measure between the face of the union nut and face of tubing nut. Refer to
f. Any fitting found out of tolerance must be replaced in accordance with instructions given in
g. After all unions have been checked for proper tightness and all repairs (if any) have been made. Insure
that the airplane is full of fuel and run the engine for three to five minutes on each tank. Perform engine
operation in a safe manner and location.
h. After engine shut down, wiggle all unions. If any fittings are found leaking, repairs must be accomplished
in accordance with paragraph 9-10.
i. When system is found leak free, replace the side panel, carpet, access plates and seat.
j. Make an appropriate logbook entry.
PIPER AIRCRAFT
PA-28-161 CADET
AIRPLANE MAINTENANCE MANUAL
Issued: FEBRUARY. 28, 1989
FUEL SYSTEM
2A13