Piper Arrow IV, Руководство по обслуживанию, Страница: 315 / 752

Figure 28-7. Tolerances; Union Nut and Tubing Nut
1. If the fitting shows evidence of galling or does not meet the dimensional requirements shown in Figure
28-5, or continues to leak after being tightened, it must be replaced.
2. The recommended repair is to remove the leaking union and replace it using a standard AN fitting as
outlined in AC43: 13-1A, Paragraph 392. This will require cutting off the swaged ferrule and adding a short
length of tubing.
3. A replacement tube and union purchased from Piper Service Sales will have the ferrule pre-swaged
onto the tube. Install the prefabricated tube as follows:
A. Apply a thread lube (Refer to Step 4, Inspection and Tightening of Fuel Line Fittings) to the
threads of the union.
B. Carefully align the tube into the union and snug-up the nut using a wrench.
C. Using a wrench, tighten the nut one to two flats (1/6 to 1/3 turn).
4. If a repair is being made using Parker-Hannifin unions and tubes without pre-swaged ferrules, they
should be installed as follows:
A. Cut off the tubing at a convenient location back from the fitting.
B. De-burr the end of the tube and prepare a short length of tube to splice into the line.
C. Screw the nut and ferrule onto the union until solidly finger tight.
D. Insert the tubes into the unions being careful to ensure proper straight alignment of the tubing and
union.
E. Using a tubing wrench, tighten the nut one and one quarter (1 1/4) turns.
5. After corrective action has been completed, perform the leak test outlined in Steps 7 and 8 of
Inspection and Tightening of Fuel Line Fittings.
28-20-20
Page 28-17
Revised: August 17, 1982
2B12
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL