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

Page: 722 / 1956

PAGE 16
Feb 28/07 30-60-00
3K10
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
(6) Modular Brush Assemblies - Brushes: Examine mounting brackets and housing for cracks,
deformation or other physical damage.
(a) Test that each brush rides fully on its slip ring over 360°. Figure 7 shows the wear pattern
if this condition is not corrected. If alignment is off, shim where brush block is mounted to
bracket or adjust mounting bracket support arm.
NOTE: The shim is a series of laminates and may be peeled for proper alignment of
brushes to slip ring
(b) Check for proper clearance of brush block to slip rings (see Figure 3). Loosen mounting
screws and move in elongated holes to correct block position and tighten securely.
(c) Visually check brush block for 2° angle of attack (see Figure 3). If not, loosen mounting
screws and twist block, but be sure to hold clearance limits shown when tightening.
1 Note direction of slip ring rotation.
2 Place template against face of brush assembly.
3 Slide brush assembly and remove template.
(7) System Wiring
Visually inspect wiring from brush blocks through firewall, to timer, to ammeter, to switch and to
aircraft power supply for breaks or damage. In such case, check continuity through affected
harness. Use the wiring diagram to trace circuitry.
Centering Brushes on Slip Rings
Figure 7