Manual override relays, Other Engineering

Manual override relays:

When the manual-override relays are not energised, this current flows through brushes riding on slip rings mounted on the propeller spinner bulkhead and into the heating elements bonded to the propeller blades.  The slip rings are connected to the heater elements through flexible conductors that allow the blades to change their pitch angle.

1761_Manual override relays.png

The timer sends current through the right propeller for about 90 seconds, then switches over and sends current through the left propeller for 90 seconds.

Some propeller de-icing systems have two separate heating elements on each blade.  Current flows through the right propeller outboard element for about 30 seconds, then through the right propeller inboard element for the same length of time.  After the right propeller is de-iced, the timer shifts over and sends current through the left propeller outboard elements and then the left propeller inboard elements.

Current cycles of the two propellers are controlled by the timer as long as the propeller Auto Prop De-ice switch is on.  When the Manual Prop De-icer switch is held in its momentary on position, the two manual-override relays are energised, and current flows directly from the bus to the blades without going through the timer.

The pilot can easily tell whether or not the de-icing system is operating correctly in the Automatic mode by watching the propeller ammeter.  It will indicate a flow of current each time one of the heater elements draws current.

Posted Date: 9/14/2012 5:14:38 AM | Location : United States







Related Discussions:- Manual override relays, Assignment Help, Ask Question on Manual override relays, Get Answer, Expert's Help, Manual override relays Discussions

Write discussion on Manual override relays
Your posts are moderated
Related Questions
External cooling Cooling of the external skin of an aero-engine is achieved by suitable design of the aircraft airframe; the layout will depend upon where the engine is fitted

Imaging Infrared Seekers  A more common approach is to use an infrared waveband where there is a large amount of ambient light from the thermal emission of the background. Th

why is it important to only strike the arc in the weld joint

Q. A. Microfinance case How would you value the price of a Microfinance Institution? Using data available on the net, explain what would you consider the value of SKS (India) or Co

Expertsmind.com brings you unique solution in electrical engineering   What is an Oscilloscope? An oscilloscope is a test instrument that displays a graph of voltage vers

Explain how a Q-meter can be used to measure resistance inductance and capacitance??

Exhaust Jet Mixing: Figure shows that the noise from the exhaust jet is the main contributor to the total noise generated by a low by-pass ratio turbo-fan. For a turbo-jet the

explain any 2 case tools in software engineering

difference between inline code and code behind file in asp.net