PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 5
Nov 30/06
2K5
28-20-00
5. Lines and Fittings
A. Inspection And Tightening
(1) Remove aft inboard inspection panel from the lower surface of right and left wing.
(2) Remove pilot’s seat and left cabin side panel. Fold back carpeting and remove the cover from
fuel line(s).
(3) Inspect all union fittings in fuel system for signs of leakage. (Note any leaking fittings for repair
or replacement.)
CAUTION: USE ONLY A TUBING TYPE CROW’S FOOT ADAPTER TO PREVENT
DEFORMING OR DAMAGING UNION NUTS AND CAUSING LEAKS
REQUIRING UNION AND TUBING REPLACEMENT.
CAUTION
: IF DURING TORQUE CHECK A GALLED NUT AND UNION ARE
SUSPECTED, BACK OFF THE NUT AND INSPECT THREADS. IF THE UNION
IS SERVICEABLE, LUBRICATE THREADS WITH MIL-L-5606 HYDRAULIC
FLUID. TORQUE THE NUT TO VALUES PER STEP 4. IF UNION IS
UNSERVICEABLE REPLACE PER “FITTING REPLACEMENT,” BELOW.
(4) Using a torque wrench and tubing crow’s foot, carefully tighten each union fitting to the
torques shown in Chart 1.
Apply thread lubricant to male connector threads only. Do not let lubricant enter the connector
seat throat or contact ferrule seat face.
(5) After torquing each fitting measure distance between face of union nut and face of tubing nut.
(Refer to Figure 3 for tolerances.)
Tolerances - Union Nuts and Tubing Nuts
Figure 3
Tube Size (OD) Torque (In. Lbs.)
(use a tubing crow’s foot)
1/4 IN. 75 - 95
3/8 IN. 175 - 195
CHART 1
FUEL LINE FITTING TORQUE
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