Double acting feathering system, Other Engineering

Double acting feathering system:

To prevent excessive drag in the event of a propeller on engine failure, the double acting propeller as with the single acting propeller requires a feathering system.


The system has mechanical and electro hydraulic means of lifting the PCU control valve. An electrically driven pump supplies the feathering oil pressure. Oil is supplied from a 'Feathering' Reserve in the main engine oil tank.

1120_double acting feathering system.png


The control valve is lifted by moving the HP fuel cock lever to 'Feather' or by the piston lift solenoid valve opening and hydraulic pressure acts on the valve lift piston.
Oil pressure from the feathering pump is directed to the coarse pitch line to feather the blades. When the feathering is complete a pressure operated switch de-energises the pump-solenoid to stop the pump.
To unfeather the HP lever is opened and the feathering pump switched on for a few seconds.


HP fuel cock lever moved to 'feather'. Feathering pump started by Manual Feather Switch. Some systems have the feathering pump switch incorporated in the Engine Fire Handle.

1574_double acting feathering system1.png


This uses the torque indicating system to sense engine failure.

When torque drops to a certain valve a low torque pressure switch completes a circuit to operate the piston lift solenoid and start the feathering pump.

Posted Date: 9/14/2012 4:17:25 AM | Location : United States

Related Discussions:- Double acting feathering system, Assignment Help, Ask Question on Double acting feathering system, Get Answer, Expert's Help, Double acting feathering system Discussions

Write discussion on Double acting feathering system
Your posts are moderated
Related Questions
Static Unbalance: This arises when two EQUAL unbalance masses are positioned at opposite ends of a rotor and spaced at 180 from each other. If placed on knife-edges, the rotor

Question 1 Explain the concept of error function Question 2 Obtain the Fourier transform for the following Single sided exponential signal Gate function Triangula

Balanced Mutual Fund The mutual fund that objective is a balance of stocks & bonds. Balanced funds refer to be less volatile than stock only funds. The return or principal value of

calculate inventory turnover ratio, when only given current assets $100,000, current liabilities, $25,000 sales $200,000 and quick ratio=1.5

how thermoelecteric thermometer is contructed and how it working

The 3 sum problem: (20 pts.) Provided a 1D array of integers, find all combinations of 3 values from this set such that: a+b+c=0 For example, if one were provided with the set [3 1

1 Scott Investors, Inc., is considering the purchase of a $447,000 computer with an economic life of five years. The computer will be fully depreciated over five years using the st

Electromagnetic Spectrum: Visible light belongs to a family of waves known as the electromagnetic spectrum. Other members of this family include high frequency short wavelength

If all states are measured by appropriate sensors and interfaced to the flight control computer then allthe states may be fed back and there is no restriction on the choice of K. S

a pilot entering a bay on course 60.3 degrees at speed 12 miles per hour sees a light bearing 37.3 true and 20 minutes later he sees it bearing 20.0 degrees true. if he keeps the