PIPER SENECA II SERVICE MANUAL
10-14. PNEUMATIC PUMP.
10-15. GENERAL.
The pneumatic pump is a rotary vane, positive displacement dry type pump. The pump is mounted on
the accessory section of each engine and rotates counterclockwise on the left engine and clockwise on
the right engine. The drive ratio to the crankshaft is 1.545:1.
10-16. TROUBLESHOOTING. (Refer to Table X-I.)
10-16a. INSPECTION.
a. Aero Accessories Tempest 215/216 (3215/3216) Series Pumps only. (Figure 10-1a.)
The Aero Accessories Tempest 215/216 (3215/3216) Series Dry-Air pump(s) are direct
replacements for the original equipment Parker / Airborne pumps. The Aero Accessories pumps
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 10-1a.
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 of the inspection hole, replace the pump.
01/01/09 X - INSTRUMENTS
2E14C
Figure 10-1a. Dry-Air Pump Vane Wear Inspection (Aero Accessories 215/216 Series)
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