—NOTE—
If during the torque check procedure the mechanic suspects a
galled nut and union, back off the nut and inspect the threads. If
the union is serviceable apply thread lube such as Slip Spray
Lubricant (DuPont) or Ferrulube (Parker-Hannifin) and torque
the nut to the proper value as listed in Step 4. If the union is
unserviceable it must be replaced as described in Replacement of
Fittings.
When applying thread lubricant ensure its application to the male
thread connector threads only. Care should be taken that no
lubricant enters the throat of the connector seat or contacts the
ferrule seat face.
5. After torquing each fitting, measure the distance between the face of the union nut and the face of the
tubing nut. Refer to Figure 28-7 for tolerances.
6. Any fittings found to be out of tolerance must be replaced. Refer to Replacement of Fittings.
7. After all of the unions have been checked for proper tightness and any required repairs have been
made, ensure that the airplane is full of fuel and run the engine for three to five minutes on each tank. Ensure
that the engine run-up is performed in a safe manner and location.
8. After engine shutdown, wiggle all unions. Any fittings found to be leaking must be repaired as
described in Replacement of Fittings.
9. When the system is found to be leak free, replace the side panel, carpet, access plates and seat.
10. Make appropriate logbook entry.
REPLACEMENT OF FITTINGS.
—NOTE—
Defueling of the aircraft may be required for union and/or tubing
replacement.
28-20-20
Page 28-16
Revised: August 17, 1982
2B11
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
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