SDR 0301136739

Service difficulty report · Computer · Boeing 747251F

Difficulty date
June 14, 2003
Submitted
June 18, 2003
Operation
Air carrier
Aircraft
N639US
Make and model
Boeing 747251F
Aircraft serial
23887
Aircraft time
61,005 hours, 13,471 cycles
Part
Computer
Part number
19642122
Condition
Failed
Location
Yaw Damper
Part time
52,414 hours
Stage of operation
CL
How discovered
O
Nature of condition
F
Precautionary procedure
H

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

What was found

DURING CLIMB THE LOWER RUDDER WAS DISPLACED 5 UNITS LEFT OF CENTER AND THE AIRCRAFT YAWED LEFT. RUDDER DISPLACEMENT WENT TO ZERO AT FL 270 AND NO FURTHER MALFUNCTIONS WERE EXPERIENCED. AIRCRAFT CONTINUED TO DESTINATION AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE LOWER YAW DAMPER COMPUTER. OPERATIONAL CHECK GOOD.