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SDR UIEA2011103100633

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Service difficulty report · Insulation · Boeing 747446

FAA SDR system

Difficulty date
October 30, 2011
Submitted
October 31, 2011
Operation
Air carrier
Aircraft
N458MC
Make and model
Boeing 747446
Aircraft serial
26356
Aircraft time
59,026 hours, 12,592 cycles
Engine
Ge CF680C2B1F
System (JASC)
7830 · Engine Thrust Reverser
Part
Insulation
Condition
Delaminated
Location
Thrust Reverser
Stage of operation
IN
How discovered
V
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 4 RT T/R INSULATION DAMAGE AS FOLLOWS (REF FIG 1) DELAMINATIONS AND PUNCTURE OF INSULATION FROM HONEYCOMB STRUCTURE IS AS FOLLOWS: DELAMINATED AREA IS 19.0" FROM FRAME TO FRAME AND 35.0" TOP TO BOTTOM. THE PUNCTURE IN THE MIDDLE IS 2.0" LONG X .7500" WIDE. THE SECOND DELAMINATED AREA ON BOTTOM IS 4.0" X 6.0" SIZE. (DISPOSITION WAS MADE TO PERFORM A TIME LIMITED REPAIR AS DESCRIBED IN PART 1 WORK INSTRUCTIONS, VISUAL INSPECTIONS AFTER EVERY (2) FLIGHT CYCLES, AND PERMANENT REPAIR WITHIN 10 CALENDAR DAYS.)