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B737 rudder actuator - current situation?

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Martin Fiddler

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Mar 18, 1997, 3:00:00 AM3/18/97
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Hi

What's the current situation regarding the PH rudder actuators
on the B737? Sticking valve sleeves are possibly suspected of alledgedly
causing rudder hard-overs, maybe contributing to a couple of
unsolved crashes due to sudden roll on final approach. I'm not sure
if anything approaching proof of the hardovers has ever been found.

Last I heard: pilots were being trained to use assymmetric thrust
as well as full ailerons to control an uncommanded roll, a kickback
test was regularly being done using the rudder pedals (on the ground,
and a redesigned rudder actuator was on the way.

Have any recommendations been made about hyd. fluid cleanliness?
What about auto-land, where the autopilot hasn't authority to
counteract a sudden roll. Are these done with more ready-ness than
usual to take manual control?

--
Martin
m.fi...@staffs.ac.uk
Phone:- mobile: 0976 382655 office: 01785 353334
http://www.staffs.ac.uk/sands/engs/staff/mf/mfiddler.htm

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