Piper Malibu PA-46-310P Pilot Operating Handbook page 504

SERVICE BULLETIN NO. 1258 PAGE3of6
INSTRUCTIONS
NQIE:
The following instructions apply to both left and right fuel vent valves.
Part I. Fuel Vent Valve Inspection
NQig: This inspection can be accomplished visually, without removal or disassembly of any airplane parts.
The main fuel tank vent assembly, Piper part number 84064-002 or 84064-010, is located on the underside of the
outboard section of the wing at Wing Station 224.5, and features a 0.43 inch diameter ventilation opening that
is integral to the panel. A portion of the fuel vent valve can be seen at approximately 3 inches deep inside this
ventilation opening, by using a bright light source. Identify the color of the fuel vent valve that is installed in the main
fuel tank vent assembly.
• If the left and right fuel vent valves are both orange in color, then modification is not required, and
there are no changes to the Limitations section of the POH. Proceed to Part IV, Documentation of
Compliance.
• If the left and/or right fuel vent valve is black in color, then modification or replacement is required
prior to further operation. Proceed to one of the following sections of this service bulletin:
0
Part II Fuel Vent Valve Modification and POH changes (Temporary Corrective Action)
OR
0
Part Ill Fuel Vent Valve Replacement (Permanent Corrective Action)
Part II. Fuel Vent Valve Modification and POH changes (Temporary Corrective Action)
Black fuel vent valves require a modification for continued use.
NQIE: Aircraft in compliance with Part II must also comply with Part Ill, according to the time intervals stated
in the COMPLIANCE TIME section of this service bulletin.
NOTE: Refer to Chapter 28 of the applicable maintenance manual for aircraft specific instructions on the
removal and installation of wing access panels.
1. Remove the main fuel tank vent assembly, retaining all screws for later reinstallation.
2. Using a razor blade, scalpel or other suitable sharp tool, carefully slice the duck bill portion of the black fuel
vent valve, as shown in Figure 1.
NQIE:
Orange fuel vent valves do not require this modification.
NQIE:
When properly completed, the existing (prior) opening at the end of the duckbill will reside on the
same plane of symmetry as the enlarged (newly cut) opening.
3. Reinstall the main fuel tank vent assembly.
4. Place a copy of this service bulletin in the Limitations Section of the POH.
For airplanes containing one or more black fuel vent valves, regardless of modification history, the following
operating limitation shall take precedence over any limitation published in the POH:
OUTSIDE AIR TEMPERATURE (OAT - Free Air Static Temperature) LIMITS
Starting In-flight
Minimum -34°C (-30°F) -34°C (-30°F)
5. Proceed to Part IV, Documentation of Compliance.