Main Landing gear uplock/brake

[MINHAS866]

Hello to everyone

I have a question related to landing gear uplock or brake assembly 

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Question:
In landing gear systems that utilize an uplock or uplock brake assembly, the uplock is typically released using hydraulic pressure during gear extension. What would happen if, during the transition of the landing gear from the up to the down position, either the circuit breaker (CB) trips or hydraulic pressure is lost? Would this cause the uplock brake to stop the landing gear in an intermediate position, or would the gear continue to extend fully?.

[MINHAS866]

Aircraft c 130 Emodel and H models

[hehe]

What year C-130?  This matters for landing gear pressure when the gear is up.

Are we talking MLG or NLG?

For MLG it is not an uplock brake, it is just a brake, it stops gear movement when pressure is removed whether the gear is up or down.  

If C/B is tripped while gear is in transit, the gear will stop receiving pressure to lower/raise after the selector valve de-energizes and the brake would set shortly after (gear would stop moving). 

For NLG, there is no brake but there is an uplock.  NLG will free fall after it comes out of the uplock but won't fully lock down without airload (typically)

[MINHAS866]

Sir bundle of thanks its 67,s E models and i was asking about main gears and  sorry for my  poor comm skills

1. Some says the landing gear control valve does not go to neutral when extending the main gears even if the cb pops out due to dentent in gear control valve when it is set to lower the gears is this true? 

2. With gears down and landing gear cont valve cb out 

Nose wheel steering will be available or not? 

[victorp1]

The landing gear selector valve will deenergize to the neutral position if the valve was in the UP position when cb is opened.

If the landing gear control cb is opened after landing gear selector valve was energized to the DOWN position then the valve will remain in the down position due to internal a ball locking device.

Any time hydraulic pressure is removed from the landing gear selector valve the main landing gear brake will engage, unless the main landing gear extension handle is pulled out.