Piper Malibu Meridian PA-46-500TP Airplane Maintenance Manual page 1440

D. Bench Assembly.
The purge tank, clamp, upper check valve, air filter, and inlet tube are pre-assembled on the bench
and installed as a unit.
(1) Upper check valve:
(a) Check arrow on check valve for proper flow direction.
(b) Screw outlet end of check valve into inlet port on purge tank and tighten. See Figure 4.
(2) Air filter:
(a) Assemble the check valve to the purge tank, see above.
(b) Ensure O-rings (2) are positioned as shown in Figure 4.
(c) Check arrow on air filter for proper flow direction.
(d) Screw outlet end of air filter into inlet port of check valve and tighten.
(3) Inlet tube:
(a) Assemble the check valve to the purge tank, see above.
(b) Assemble the air filter to the check valve, see above.
(c) Connect the marked tube end to the air filter and tighten.
E. Inspection and Cleaning.
Each 400 hours or two (2) years, whichever comes first, clean and inspect the purge tank, check
valves, air filter, and flow divider/purge valve as described below. Replace O-rings.
(1) Remove components per Removal, above.
(2) Purge tank:
(a) Flush tank with Stoddard solvent and blow dry with shop air.
(b) Visually inspect for condition, damage, and evidence of leaks. Replace as required.
(3) Air filter:
(a) Visually inspect for rust and corrosion. Evidence of either is cause for replacement.
(b) Check arrow on air filter for flow direction.
(c) Backflush with Stoddard solvent and shop air. Blow dry with shop air.
(4) Check valves:
(a) Visually inspect for foreign material and corrosion. Evidence of corrosion is cause for
replacement.
(b) Check arrow on check valve for flow direction.
(c) Pressure flush check valve with methyl eythel ketone (MEK) solvent to remove carbon
particles or other residue.
(d) Allow solvent to drain and then blow dry with shop air.
(e) Leak test as follows:
1
2
3
(f) Disconnect, drain water, and blow dry with shop air.
71-70-00
PAGE 6
Apr 15/07
PIPER AIRCRAFT, INC.
PA-46-500TP, MALIBU MERIDIAN
MAINTENANCE MANUAL
Connect a filtered, regulated (40-100 psi), air source to the outlet end of the check
valve.
Hold check valve with inlet end up and fill with water.
Apply regulated air to outlet end of check valve and observe water in inlet end for
evidence of leakage (i.e. - bubbles). If leakage detected, repeat steps (a) thru (d),
above and then repeat leak test. If leak still detected, replace check valve.
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