Piper PA-28-161, Maintenance Manual

Page: 424 / 1104

PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 6
Nov 30/06
2K6
28-20-00
(6) Replace any out of tolerance fitting per replacement of fittings.
(7) Check all unions for proper tightness. Check all repairs are made. Verify airplane is full of fuel
and run engine three to five minutes on each tank. (Perform engine operation in a safe manner
and location.)
(8) Shut down engine and wiggle all unions. If any fittings are leaking, repair per replacement of
fittings.
(9) When system is leak free, replace side panel, carpet, access plates, and seat.
(10) Make an appropriate logbook entry.
B. Fitting Replacement
NOTE: Airplane defueling may be required for union or tubing replacement.
(1) Repair fittings that show evidence of galling, do not meet Figure 3 dimensional requirements,
or leak after tightening.
(2) The recommended repair is to remove leaking union and replace with standard AN fitting as
per latest revision of AC43.13-1. This will require cutting off swaged ferrule and adding a short
length of tubing.
(3) A replacement tube and union purchased from Piper will have the ferrule pre-swaged onto
tube. Install tube as follows:
(a) Lubricate male threads of union with MIL-L-5606 hydraulic fluid.
(b) Carefully align tube into union and snug up the nut with a wrench.
(c) Using the wrench, tighten nut one to two flats (1/6 to 1/3 turn).
(4) Repairs made using Parker Hannifin unions and tubes without pre-swaged ferrules must be
installed as follows:
(a) Cut off tubing back from the fitting.
(b) De-burr tube end and prepare a short length of tube, to splice into line.
(c) Lubricate the ferrule and threads on the body and nut with MIL-L-5606 hydraulic fluid.
(d) Screw nut and ferrule onto union until solidly finger tight.
(e) Insert tubes into unions and check proper straight alignment of tubing and union.
(f) Tighten nut one and one-quarter turns using a tubing wrench.
(5) Perform leak test per steps (g) and (h), Electric Fuel Pump - Adjustment - In Airplane, above.