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mechanic by night
Join Date: Jan 2002
Location: south of atlanta
Posts: 110
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As a matter of fact I was working a similiar problem on a 757 last night. Most likely one would expect the drivers to write up an excessive trim (aileron), with ,maybe, a spoiler warning light. When trouble shooting that problem, spoiler float is looked at early. Now I do not know exactly how a 747-400 works but if it is the same as 757,767 a spoiler actuator replacement should fix the problem.
The spoiler actuator has a position transmitter inside that Boeing calls a LVDT (linear variable differential transformer). When you replace an actuator it is necessary to "null" this transmitter. You have to give the controller a signal that represents effectivly zero. It is possible that this actuator needs re nulled but the adjustment does not normally move on its own so more than likely an actuator should be replaced.
It is normally an easy job, two hours or so. This is what I did last night.
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76 911 "The Blond B_ch"
(what the wife calls it)
09 Mazda 3
06 subaru legacy spec B
91 track miata
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