Service difficulty report · Actuator · Boeing 747212B

Difficulty date
March 21, 1999
Submitted
March 26, 2000
Operation
Air carrier
Aircraft
N521UP
Make and model
Boeing 747212B
Aircraft serial
21944
Part
Actuator
Part number
33206001
Condition
Failed
Location
Nr 6 Spoiler
Stage of operation
IN
Nature of condition
F
Precautionary procedure
K

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

What was found

INSPECTION TYPE-2ACK, NR 6 SPOILER ACTUATOR ROD BROKEN. THIS DISCREPANCY FOUND WHEN SPOILER LOCKS WERE INSTALLED FOR SCHEDULED 2A CHECK. WHEN HYDRAULIC PRESSURE WAS PUT ON SYSTEM, ACTUATOR ROD FAILED. SUSPECT THAT THE ROD HAD A PRE-EXISTING CRACK. SPOILER ACTUATOR WAS REMOVED AND REPLACED PER M/M 27-62-00.

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