since 1940

Aircraft Maintenance TroubleShoot > Aircraft Turbocharger & Controller

Cessna 401, 402 67-68

2. High-mounted turbos with scavenged oil system.

3. The rate/absolute dual controller performs the functions of both the rate controller and the absolute pressure controller. Components serving the separate functions are housed in a common body and capillary assembly with shared sensing and hydraulic ports.

The fixed absolute controller portion of the dual controller hydraulically regulates the wastegate opening for all engine. The controller senses deck and ambient pressures and compares them to a referenced absolute pressure. When the ratio of outlet to ambient pressure exceeds a preset proportion, the controller opens the wastegate and lowers turbo output.

If fitted, a pressure relief valve, set slightly in excess of maximum deck pressure is provided to prevent damaging overboost in the event of a system malfunction.

Copyright 2003 by Sacramento Sky Ranch Inc. All rights reserved.  Prices subject to change without notice. Not responsible for typographical or misprint.
Disclaimer: sacskyranch.com contains abundant information relating to aircraft maintenance. The information provided  is not intended to supercede or supplement the F.A.A. approved  maintenance and/or operator’s manuals. Those F.A.A. approved manuals must be utilized when performing maintenance and/or operating aircraft.