Service difficulty report · Actuator · Boeing 767333

Difficulty date
March 17, 2007
Submitted
November 3, 2008
Operation
General aviation
Make and model
Boeing 767333
Aircraft time
55,599 hours
Engine
Pwa PW4060
Part
Actuator
Part number
VL200307A
Condition
Failed
Location
Leg Rest
Component
Seat · Boeing
Component part number
S23101001001
Stage of operation
CR
How discovered
O
Nature of condition
O
Precautionary procedure
O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

(CAN) SEAT LOCATION ON THE ACFT WAS 7F, AND FAILED IN FLIGHT. LEG REST ACTUATOR KEPT DRIVING THE FOOTREST BACKWARD, AND PUNCTURED THE REAR SPAR OF THE SEAT. THERE IS A CONCERN THAT ECU SOFTWARE 2.8 MAY BE TO BLAME, BUT INVESTIGATION IS ON GOING. THERE HAS BEEN A PREVIOUS CASE OF A BENT SPAR, PRIOR TO THIS LEVEL OF SOFTWARE, SO IT IS POSSIBLE THAT THERE IS STILL AN UNKNOWN FAILURE MODE THAT CAUSES THE FEEDBACK FROM THE FOOTREST POSITION TO BE LOST, AND DRIVE THE FOOTREST UNTIL FAILURE.