Service difficulty report · Bolt · Doug DC1010

Difficulty date
June 28, 1999
Submitted
March 26, 2000
Operation
Air carrier
Aircraft
N1839U
Make and model
Doug DC1010
Aircraft serial
46633
Engine
Ge CF66D
Part
Bolt
Part number
ACG71041
Condition
Broken
Location
Nlg Actuator
Stage of operation
NR
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

HEARD LOUD BANG WHEN GEAR EXTENDED. BELIEVE IT TO BE NOSE GEAR DOOR AS WE HAD 3 GEAR GREEN LIGHTS. NLG RETRACT ACTUATOR MOUNT BOLT FAILED AND MIGRATED OUT OF THE LOWER CLEVIS ALLOWING GEAR TO FREE FALL UNRESTRICTED BY THE ACTUATOR. NLG RT FWD DOOR DRIVE LINK WAS BENT AND LT DOOR DRIVE LINK BROKEN. THE BOLT AND THE RETRACT ACTUATOR WERE REPLACED. RT AND LT DRIVE LINKS WERE REPLACED. SECONDARY DAMAGE TO THE NLG DOORS WAS REPAIRED. MAGNETIC PARTICLE INSPECTION WAS PERFORMED FOR NLG RETRACT ACTUATOR LOWER ATTACH LUG, NO DEFECT WAS FOUND. INTENSIFIED VISUAL AND HFEC INSPECTION WAS PERFORMED FOR UPPER AND LOWER LOCK LINKS AT ITS UPPER A-FRAME LUG, TRUNNION ATTACH POINTS, NLG DRAG LINK ATTACH POINTS AND NLG AF

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