Service difficulty report · Acoustic Panel · Boeing 7378Z9

Difficulty date
September 30, 2020
Submitted
November 24, 2020
Operation
Air carrier
Aircraft
N342AM
Make and model
Boeing 7378Z9
Aircraft serial
34262
Aircraft time
48,321 hours, 21,171 cycles
Part
Acoustic Panel
Condition
Dented
Location
Lt Nacelle
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 OVERNIGHT CHECK AT MEX STATION, IT WAS DETECTED A SEVERAL DENTS AND A NICK ON LEFT ENGINE INNER BARREL ACOUSTIC PANEL INLET COWL. MAINTENANCE PERSONNEL PERFORMED A REVISION, DETECTING A SEVERAL DENTS WITH 2.875" AND 1.500"OF SEPARATION; A DENT OF 0.500 LENGTH, 0.001" DEPTH, 0.468 WIDTH; A DENT OF 0.500 LENGTH, 0.001" DEPTH, 0.375 WIDTH; A DENT OF 0.0437 LENGTH, 0.001" DEPTH, 0.0.406 WIDTH; A DENT OF 0.0.718 LENGTH, 0.005" DEPTH, 0.0.468 WIDTH AND A NICK OF 0.109" LENGTH, 0.062" WIDTH AT AFT EDGE INNER BARREL ACOUSTIC PANEL AND FROM 1.156" OF FASTENER, 10", 6.781 AT 6 HRS, 8 HRS, BETWEEN 3 AND 4 HRS POSITION. THE WO´S 7056228, 7056229 AND 7056272 WERE ISSUED TO REPAIR THE DAMAGES DETECTED. AN ULTRASONIC THICKNESS MEASUREMENT INSPECTION, TAP TEST AND DETAIL VISUAL INSPECTIONS WERE PERFORMED ON DENT AREAS, IAW B737 NDTM PART 1, 51-05-01 AND NDTM PART 4, 51-00-00 PROCEDURE 2, WITHOUT DETECTING ANY CRACKS OR DISBONDS WITH ORIGINAL THICKNESS OF 0.032". OF MINIMUM REMAINING THICKNESS 0.021" OUT OF LIMITS, IAW SRM 54-10-01, ALLOWABLE DAMAGE 1, PART 4C (2) FIGURE 103, DETAIL C. DENTS WERE REPAIRED IAW COLLINS MESSAGE NUMBER CV20-11065 AND SRM 54-10-01, REPAIR 14 PART 4. DENTS WERE ACCEPTABLE AS PERMANENT REPAIR, IAW COLLINS MESSAGE NUMBER CV20-11065. NICK WAS REMOVED IAW SRM 51-10-02 THE INNER BARREL ACOUSTIC PANEL WAS REPAIRED, IAW SRM 54-10-01 REPAIR 7 PART 4. ALUMINIZED EPOXY WAS APPLIED, IAW SRM 54-10-01-2R-7/14 ON LEFT ENGINE INNER BARREL ACOUSTIC PANEL INLET COWL, ALL CORRECT.

More about the Boeing 737-8Z9