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Great Above

NTS switch

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On 12/13/2016 at 10:57 AM, Great Above said:

1.   Pls why do we perform NTS checks on the C130?

2.   Why do we place the NTS/Valve switch to NTS before engine shutdown

To check the serviceability of NTS system in every post flight shutdown.  Three position SW is selected to NTS position before shutdown of engine because the system must  be checked either it is serviceable for next flight or not.

Munir Abbasi

Home of hercules Pakistan

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On 12/12/2016 at 11:57 PM, Great Above said:

1.   Pls why do we perform NTS checks on the C130?

2.   Why do we place the NTS/Valve switch to NTS before engine shutdown

1) The in flight check is to make sure the NTS system is adjusted correctly to prevent excessive drag and also to ensure the propeller speed or acceleration will be controlled during airstart. In flight the switch is in VALVE to "show" actual feather valve movement which causes the increase in blade angle.

2) The on the ground shutdown selection of NTS allows us to "see" the movement of the "NTS Linkage" that would normally actuate the feather valve. The linkage is camed out so it cannot actuate the feather valve but we want to make sure the system linkage is moving for the next flight.   

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12 hours ago, NATOPS1 said:

1) The in flight check is to make sure the NTS system is adjusted correctly to prevent excessive drag and also to ensure the propeller speed or acceleration will be controlled during airstart. In flight the switch is in VALVE to "show" actual feather valve movement which causes the increase in blade angle.

2) The on the ground shutdown selection of NTS allows us to "see" the movement of the "NTS Linkage" that would normally actuate the feather valve. The linkage is camed out so it cannot actuate the feather valve but we want to make sure the system linkage is moving for the next flight.   

FRT Thanks for excellent explanation of NTS System.

Munir Abbasi

Home of hercules Pakistan

Edited by munirabbasi

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13 hours ago, NATOPS1 said:

1) The in flight check is to make sure the NTS system is adjusted correctly to prevent excessive drag and also to ensure the propeller speed or acceleration will be controlled during airstart. In flight the switch is in VALVE to "show" actual feather valve movement which causes the increase in blade angle.

2) The on the ground shutdown selection of NTS allows us to "see" the movement of the "NTS Linkage" that would normally actuate the feather valve. The linkage is camed out so it cannot actuate the feather valve but we want to make sure the system linkage is moving for the next flight.   

1.NTS system is checked before engine shut down in air, when its ok then shut down the engine during aircrft FCF. if NTS system not functioning u could not shut down the engine for further air start.                                                               2. The system fuction not only use during air start only,  it's work during when prop try to rotate engine.this system start functioning & increase the angle prop throu mechnically linkage NTS bracket actuate the feathering valve. This system work in only alpha range. During shut down only mechnically  linkage & NTS switch serviceability checked for next flight. 

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3 minutes ago, Ahmer said:

1.NTS system is checked before engine shut down in air, when its ok then shut down the engine during aircrft FCF. if NTS system not functioning u could not shut down the engine for further air start.                                                               2. The system fuction not only use during air start only,  it's work during when prop try to rotate engine.this system start functioning & increase the angle prop throu mechnically linkage NTS bracket actuate the feathering valve. This system work in only alpha range. During shut down only mechnically  linkage & NTS switch serviceability checked for next flight. 

Good

Regards

Munir Abbasi

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10 hours ago, Ahmer said:

1.NTS system is checked before engine shut down in air, when its ok then shut down the engine during aircrft FCF. if NTS system not functioning u could not shut down the engine for further air start.     

                                                 

FYI, If the NTS is not functional there is an alternate procedure to restart that engine if it were required to be shutdown and subsequently restarted.

This would be an unusual situation but there is a procedure for air starting an engine with an "inoperative" NTS system.  

 

Additionally, the actual NTS process or "function" is the same be it during air start or negative torque (prop drive the engine)  and the systems "works" all the time however during beta operation the linkage when actuated will not cause feather valve movement due to the movement of cams rendering the NTS ineffective not inoperative.        

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39 minutes ago, NATOPS1 said:

FYI, If the NTS is not functional there is an alternate procedure to restart that engine if it were required to be shutdown and subsequently restarted.

This would be an unusual situation but there is a procedure for air starting an engine with an "inoperative" NTS system.        

 

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At normal FCF  u can not shut down the engine with inoperative NTS system .                                                                                But yes u can restart attempt of engine in only greater emergeny as per TO B-1.

Edited by Ahmer

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1 minute ago, Ahmer said:

At normal FCF  u can not shut down the engine with inoperative NTS system .                                                                                But yes u can restart attempt of engine in only greater emergeny as per TO B-1.

Correct dear Ahmer..... Bcoz i think  no one will take risk of shutting down an engine in a FCF with a known defect of NTS system.... But yes EMERGENCY situation will dictate the shut down and if required to restart the air start....

REGARDS. 

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