7. After all unions have been checked for proper tightness and all repairs (if any) have been made,
ensure that airplane is full of fuel and run engine for 3 to 5 minutes on each tank.
8. After engine shutdown, wiggle all unions. If any fittings leak, make repairs in accordance with
Replacement of Fittings.
9. When system is leak free, replace side panel, carpet, access plates, and seat.
REPLACEMENT OF FITTINGS
—CAUTION—
Defueling of airplane may be required for union or tubing
replacement.
1. If fittings show evidence of galling, or do not meet dimensional requirements (refer to figure 28-5), or
continue to leak after being tightened, they must be replaced.
2. The recommended repair is to remove the leaking union and replace it using a standard AN fitting as
outlined in AC 43.13-lA, paragraph 392. This will require cutting off the swaged ferrule and adding a
short length of tubing.
3. If a Piper replacement tube and union is being used, the ferrule is pre-swaged onto the tube. Install the
pre-fabricated tube as follows:
a. Apply a thread tube to threads of union.
b. Carefully align the tube into union and tighten nut with wrench.
c. Then using wrench, tighten the nut from one to two flats (1/6 to 1/3 of a turn).
Figure 28-5. Tolerances, Union Nut and Tubing Nut
28 - 24 - 00
Page - 28-12
Reissued: August 1, 1986
2B6
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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