(Corey C. Jordan) wrote:

On 23 Sep 2003 05:53:00 GMT, (DunxC) wrote:

By the way, the "damage" was the result of a design fault in the nose gear
extension mechanism, not a result of excessive speed on climbout.

The damage was caused by fast retraction of the nose gear on take-off (because
of the weak cylinder against building airspeed); the solution to that one was
to fit a restrictor in the hydraulic 'up' line. Any other problems were linked
to, but not the cause of, the damage.

The NAA logs are quite detaioled on this.

Duncan

According to Roy Ferrin, the actuator was replaced with one having a
larger diameter piston, and the door linkage was adjusted to close a tad sooner.
I can't see how a flow restrictor in the line will compensate for a lack of
force resulting from inadequate pressure area. If you want more push for a given
hydraulic pressure, you need a larger cylinder.

My regards,

Widewing (C.C. Jordan)

They likely had to cause the NG to retract fast originally
because as mentioned the cyl was weak and they needed to get the
gear up before the airspeed had built up too far. That's what I
gather from the writeup above. Problem likely was that, although
the restrictor would reduce the speed of the retraction, it seems
reasonable that it would combat the purpose of the fast
retraction. Seems reasonable to fit a more powerful jack as they
did.
--

-Gord.