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Sigma-Tek Dry Air Pump

The Sigma-Tek 1U128-006 is a pump which carries a warranty for 2-years or 1000 hours. It uses an aluminium rotor and rotor housing, making the pump very resistant to damage from ingestion of foreign objects, excessive loads or engine oil. It provides clean, dry air for operation of air driven instruments in aircraft operating at medium altitudes. Pump rotates clockwise or counter clockwise in vacuum or pressure mode. May be mounted in either a vertical or horizontal position. FAA approved as a direct replacement for all instrument pumps but is not intended for supplying air to de-icing boots. Mounting gasket furnished. Install suction regulator in line to instruments. Delivers 6 In. Hg vacuum (2.9-8.5 minimum CEM) or 6 In. Hg pressure (3.7-8.5 minimum CEM) from 1500 to 4000 RPM. No core charge.

  • Height: 3.825" ± .03" 
  • Width: 3.55" ± .03" 
  • Depth: 3.91" ± .06" 
  • Weight: 2.2 lbs. (max)
  • Engine Pad: AND 20000 
  • Rotation: Bi-directional 
  • Overhang Moment: 5.2 in-lbs 
  • Static Coupling
  • Shear Torque: 175 in-lbs (max)


  • Port Threads: 3/8" x 18 N.P.T. 
  • Hose Fittings: 1/2" I.D. (min) 
  • Hose / Tubing: 5/8" I.D. (min) 
  • Inlet Filter: 0.3 microns


  • Ambient Temperature: -40° C to 93° C (typ.) 
  • Exhaust Temp. (Intermittent): 375° F for 5 mins. (max) 
  • Exhaust Temp. (Continuous): 300° F 
  • Vibration:CPS: 5 to 150
  • Maximum Double Amplitude: 0.100 in.
  • Maximum Acceleration: 10 G's 
  • Humidity (Dewpoint): -70° C 
  • Altitude: -1,000 to 30,000 ft.

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