Piper Malibu PA-46-310P Pilot Operating Handbook page 505

SERVICE BULLETIN NO. 1258
PAGE4of6
Part Ill. Fuel Vent Valve Replacement (Permanent Corrective Action)
Black fuel vent valves require eventual replacement, regardless of modification history .
.t:iQTI;:
Compliance with Part Ill of this service bulletin is mandatory, regardless of prior compliance history
with Part II of this service bulletin.
t:HD:E:
Refer to Chapter 28 of the applicab1e maintenance manual for aircraft specific instructions on the
removal and installation of wing access panels.
NQIE:
Refer to Figure 2 of this service bulletin to identify the fuel vent valve features mentioned in the
instructions that follow.
1. Order replacement orange fuel vent valve(s), Piper part number· 106927-001, quantity 1 or 2, as required.
2. Remove the main fuel tank vent assembly, retaining all screws for later reinstallation.
3. Grip the exposed, duckbill portion of the black fuel vent valve with pliers. Using a pulling/twisting motion,
carefully remove the fuel vent valve from the main fuel tank vent assembly, and discard fuel vent valve.
NOTE:
The entire black fuel vent valve must be removed from the main fuel tank vent assembly prior to
proceeding.
4. Using finger pressure, fold the umbrella valve portion of the replacement orange fuel vent valve towards the
duckbill valve, and press the fuel vent valve into the circular opening of the main fuel tank vent assembly,
continuing until the umbrella portion is completely through the opening, and no further.
5. Grip the duckbill of the fuel vent valve between the thumb and forefinger, and slowly pull the fuel vent valve out,
stopping when the mounting groove seats against the opening of the main fuel tank vent assembly.
6. Reinstall the main fuel tank vent assembly.
7. Verify proper functioning of orange fuel vent valve, by using a manometer to perform the leak evaluation
described in section 28.:.10-00 of the applicable maintenance manual instructions.
8. If a copy of this service bulletin (current revision or previous revision) has been placed in the Limitations section
of the POH, remove the service bulletin. The operating limitations specified in Part II no longer apply.
9. Proceed to Part IV, Documentation of Compliance.
Part IV. Documentation of Compliance
Make a logbook entry documenting compliance with this service bulletin.