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Forum: Rotorheads

14th Feb 2009, 13:46

Replies: 22

(A)B 412 with collective stuck down....

Views: 3,276

Posted By Leeuwarden AFB-Ed

final succesfull result

We installed a overhauled set of main rotor blades and that solved the problem. Still we've a questionmark how this problem occured from one day to the other. For now we are operational again and...

Forum: Rotorheads

11th Feb 2009, 11:55

Replies: 22

(A)B 412 with collective stuck down....

Views: 3,276

Posted By Leeuwarden AFB-Ed

testresults pitch link change

What we did too reduce the feedback load from the rotor to the collective system is:
Lenghten all four pitch links with two full turns followed by the 100% full hydr.test during ground run.(we're...

Forum: Rotorheads

10th Feb 2009, 11:42

Replies: 22

(A)B 412 with collective stuck down....

Views: 3,276

Posted By Leeuwarden AFB-Ed

idle and 100% test and 25hrs

Thanks!

First, the hydr test in idle is ok. 100% fails (collective will not be able to move fully down from approx 80% RRPM and up).
We were thinking about servo, and replaced actuator but...

Forum: Rotorheads

10th Feb 2009, 08:36

Replies: 22

(A)B 412 with collective stuck down....

Views: 3,276

Posted By Leeuwarden AFB-Ed

R02

Thanks, will send regards to Bart (small world).
Checking rigging again including measurements. When we check it static (hydr test unit in hangar then evrything works great.....)
And we did not...

Forum: Rotorheads

10th Feb 2009, 07:07

Replies: 22

(A)B 412 with collective stuck down....

Views: 3,276

Posted By Leeuwarden AFB-Ed

Only on collective...

Many thanks for the reply!
It only happens with collective down. Not able to come down fully, stays up with about 30% torque. Cyclic feels good on both systems.
We tried different OAT for...

Forum: Rotorheads

9th Feb 2009, 21:14

Replies: 22

(A)B 412 with collective stuck down....

Views: 3,276

Posted By Leeuwarden AFB-Ed

(A)B 412 with collective stuck down....

Hope to receive some response on our latest problem with one AB412SP.
After 25hrs inspection (only inspection) we encountered a collective problem during 100% HYDR check (first flight of the day):...

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