Service difficulty report · Jackscrew · Boeing 7472D7B

Difficulty date
December 27, 2011
Submitted
December 28, 2011
Operation
Air carrier
Aircraft
N522MC
Make and model
Boeing 7472D7B
Aircraft serial
21783
Aircraft time
110,348 hours, 22,088 cycles
Engine
Ge CF650E2
Part
Jackscrew
Condition
Damaged
Location
Thrust Reverser
Stage of operation
IN
How discovered
9
Nature of condition
O
Precautionary procedure
K

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

What was found

DURING WALKAROUND, MX FOUND THE NR 2 LT THRUST REVERSER HALF DAMAGE AND NOTICED A BROKEN JACK SCREW ON THE UPPER ANGLE GEARBOX/BALL SCREW ACTUATOR, BROKEN CASCADE VANES AND SHEARED FLEX CABLES. (DISPOSITION WAS MADE TO PERFORM A TIME LIMITED REPAIR AS DESCRIBED IN PART 1 WORK INSTRUCTIONS, DVI EVERY FLIGHT CYCLE; AND PERMANENT REPAIR PRIOR TO THE ACCUMULATION OF 5 FC (FLIGHT CYCLES) AFTER PART 1.)

More about the Boeing 747-2D7B