benjamin92

21 hours ago, hehe said:

If the handle locks up at 40% it is almost always because someone pulled the UP lock lever while lowering flaps.  The lock and flap lever interfere with each other in this state and lock the handle up.

What model of C-130 was this? 

 

Thanks for sharing! 

It was a H model

Thanks for your sharing..

it was a H model

16 hours ago, hehe said:

So they went from zero to 40% flaps and the handle stopped or flaps stopped?

If the handle stopped moving, I know exactly what caused it.

If flaps stopped, the handle would be at 100% but flaps would only be at 40%.

The handle was working fine but it was the flaps that stopped.

Although, do you mind sharing what could have caused the handle to stop?

18 minutes ago, hehe said:

When you say you had flaps stuck at 40%............

Handle could still move from full up to 100%?  Utility pressure was solid around 3k when trying to move flaps?   Did it trip when flaps were going up or down?   Did you find water in the asymmetry brake switches?

Reason I ask these things is because 40% is a very specific range where a lot of crews induce their own "flap failure" issue that is just operator error.

Yes the handle, utility pressure was good.

Flaps were coming down from 0% on approach.

No water was found, but the switches did look worn probably due to long hours of installation.

I became quite curious too after noticing that other operators had the flaps stuck at the same specific point.

Could you elaborate more what is meant by operator error and how it could have induced the defect?

@hehe thanks for sharing your comments, found it very valuable in understanding the assymetric brake system.

we also had a case of flaps being stuck at 40% during landing, using the knob style emergency flap brake valve.

Upon landing and during our ground test, the flaps worked normally.

You mention that you ever experienced internal leakage of brake valves.
Would such a leakage cause the brakes to activate, but yet not "latch" the valve/button and trap pressure?

We suspect that because they were not latched, the hydraulics that activated the brakes in-flight was allowed to return to the utility reservoir when pressure was depleted,
hence the system worked fine during our ground test.