Service difficulty report · Leg Assy · Boeing 747451

Difficulty date
March 14, 2013
Submitted
April 17, 2013
Operation
Air carrier
Aircraft
N105UA
Make and model
Boeing 747451
Aircraft serial
26473
Aircraft time
76,618 hours, 9,003 cycles
Engine
Pwa PW4056
Part
Leg Assy
Condition
Underserviced
Location
Nlg
Stage of operation
CL
How discovered
O
Nature of condition
W
Precautionary procedure
A

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

What was found

NLG DID NOT RETRACT, RTFL DUE HISTORY OF NLG OLEO PRESSURE LOSS AND RETRACTION DAMAGE TO STA 340 BULKHEAD BRACKET AND ATTACHED HYDRAULIC LINE, CARRY OUT CONTROLLED NLG RETRACTION USING HYDRAULIC RIG TO DETERMINE POSSIBLE CAUSE OF DAMAGE. RETRACTION CATTIED AND FOUND DAMAGE CAUSED BY UNDER INFLATED OLEO LEG. FOLLOWING COMPLETION OF FACT FINDING GEAR SWING AND NOSE OLEO SERVICING COMPLETE GEAR SWING TO VERIFY RESULTS OF NOSE OLEO SERVICE TROUBLESHOOTING. GEAR SWING COMPLETED ALL FOUND SATIS