Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 1425 / 1956

PAGE 17
Feb 28/07 7G3
74-10-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
F. Testing
Complete Magneto Reassembly, above. Verify that the T-118 Timing Pin has been removed.
(1) Mount the magneto on a suitable test stand in the same relative position as installed on the
engine.
CAUTION: DO NOT OPERATE THE MAGNETO UNLESS THE IGNITION HARNESS IS
INSTALLED AND THE OUTPUT LEADS ARE CONNECTED TO THE 5MM GAP.
(2) Install a Slick High-Temperature Ignition Harness on the magneto and connect each output
lead to a 5mm spark gap.
(3) Coming-in Speed
(a) Determine the lowest speed at which the magneto can be turned and still spark all 5mm
gaps without missing.
(b) The test gap must fire consistently at 200 RPM on both magnetos.
(4) Pressure Testing
After magneto reassembly, install a pressurized harness cap and apply 15 psi filtered air to the
inlet nozzle of the magneto (see Figure 12). Air flow at 15 psi is not to exceed 40 standard
cubic feet per hour (SCFH). If flow is excessive, reposition gaskets and retorque housing and
harness cap screws. Screws should be torqued to 21-25 in-lbs. for 6300 series magnetos.
Testing should be conducted with magneto at room temperature.
Magneto Pressure Test Set-up
Figure 12