Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
APU Engine
APU engines usually consist of a centrifugal compressor and a radial turbine however, axial compressors and turbines may be added or used in their own right. Centrifugal compressors are used because of their high compression and small size and when combined with a radial type turbine make the APU very compact. These components are also very robust and require less maintenance than axial flow components. Use is also made of reverse flow combustion chambers that again makes the overall size smaller.
In most cases there is a design compromise made between the ideal APU for an aircraft i.e. its ability to provide air and electricity throughout the operational envelope of the aircraft, and it weight and size. It is usual therefore to find that air and electricity are limited to various altitudes dependant upon the parameter required.
APU systems are very basic and the APU will shut down if a problem is sensed. Most APU's will shut down for the following faults:
Fault
Comment
Low Oil Pressure
Engine Overspeed
110% Honeywell 108% Sundstrand
High EGT
849°C Honeywell
Loss of Speed Signal
Electronically monitored APU's need this signal to control the APU.
Los of EGT Signal
Low Speed
Some APU's shutdown if they drop below 90%.
(Some will try and relight at 95%)
Electronic Unit Failure
Loss of Control
The APU may also shut down on the ground (not in flight) for the following faults:
Fire
May cause a warning horn in the u/c bay to sound
Generator Drive Low Oil Pressure or High Oil Temperature
flip-flop
Economic Definition : Manufacturing increase the value of product. Technological Definition : Manufacturing is a process which gives required strength, shape and size of t
Draw the QAM constellation diagram of 10110100
At a machine tool plant, five jobs must be completed each day. The time it takes to do each job depends on the machine used to do the job. If a machine is used at all, there is a s
How would you judge the potential profit ofBajaj Electronics on the first year of sales to Booth Plastics and give your views to increase the profit?
Q. Distinguish between Fresnel's and Fraunhofer's classes of diffraction. Show that the relative intensities of successive maxima of Fraunhofer diffraction at single slit are
Q. Discuss briefly the causes and remedies of misrun and cold shunts casting Cold Shunt and Misrun : When the metal is unable to fill the mould cavity completely and t
explain easily
Oil supply failure - Propeller: To prevent an overspeed caused by an oil supply failure, one of two methods may be employed: • Hydraulic lock valve The pitch lock mecha
explain application of zener diode for meter protection
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd