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

Page: 1098 / 1956

PAGE 2
Feb 28/07
6D4
37-10-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
3. Vacuum Pump(s)
Two (2) engine-driven dry-air pumps are mounted on the accessory section at the rear of the engine.
Each vacuum pump is a rotary vane, positive displacement type. These units consist of an aluminum
housing, a carbon rotor and carbon vanes. They are driven by means of a coupling mated to an engine-
driven gear assembly.
A. Inspection (See Figure 1.)
NOTE: Aero Accessories (Tempest) Dry Air (Vacuum) Pumps are factory installed in S/N’s
4636339 & up , and as service replacements. The following inspection applies only to those
pumps.
The vacuum pump(s) feature a wear indicator inspection port on the back cover which allows direct
observation of pump vane wear. Beginning at 500 hours time-in-service, and each 100 hours
thereafter, remove the inspection port plug and observe vane wear as shown in Figure 1.
(1) As the vanes wear, they slide outboard in the vane slots in the rotor.
(2) When the portion of the vane that can be observed in the inspection hole covers approximately
1/8 TH of the inspection hole, replace the pump.
Vacuum Pump Vane Wear Inspection
Figure 1