1 / 8

Secondary Power Systems

Secondary Power Systems. Auxiliary Power Units/Emergency Power Units (APU/EPU) Ram-Air Turbines (RAT) Batteries. Useful before flight Enables aircraft to be independent of ground power Generally located in the tail of the aircraft. Useful during flight

sage
Download Presentation

Secondary Power Systems

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Secondary Power Systems Auxiliary Power Units/Emergency Power Units (APU/EPU) Ram-Air Turbines (RAT) Batteries

  2. Useful before flight Enables aircraft to be independent of ground power Generally located in the tail of the aircraft Useful during flight Provides power in case of engine failure Very important in modern fly-by-wire aircraft Auxiliary Power Units

  3. APU Manufacturers and Weights • Three main manufacturers: • Honeywell International Inc • Pratt & Whitney Canada • Hamilton Sundstrand • Boeing 777 uses Honeywell 351-500 which weighs 730lbs dry • Boeing 747-400 uses PW901 which weighs 835lbs dry • MD-90 and A320 use Honeywell 131-9 models that range in weight from 350-450lbs dry

  4. Pneumatic Link Location flexibility Decrease in overall efficiency Electrical Link Location flexibility & increased system integration Increased startup requirements Mechanical Link Limited Positioning High Efficiency Hydraulic Link Location flexibility Complex operation and ground startup Hybrid A combination of all these APU Design Approaches

  5. Ram-Air Turbines • Deployed in power system failure • An air-driven turbine for power generation • Relatively simple design • Low power output • Does not require stored power for startup

  6. Batteries • Power storage medium • Batteries provide emergency power between complete main system failure and backup system startup • Provides power to startup secondary power systems

  7. References • Pallett, EHJ. Aircraft Electrical Systems. John Wiley & Sons, Inc., New York. 1987. 3rd Edition. • Secondary Power Systems. Mechanical Engineering Publications Limited, London. 1985. • Raymer, Daniel P. Aircraft Design: A Conceptual Approach. AIAA, Reston, VA. 2006. 4th Edition • Fielding, John P. Introduction to Aircraft Design. Cambridge University Press, New York. 1999. • Moir, Ian and Seabridge, Allan. Aircraft Systems: Mechanical, Electrical, and Avioncs Subsystems Integration. AIAA, Reston, VA. 2001

More Related