Service difficulty report · Beam · Boeing 7377H4

Difficulty date
February 7, 2023
Submitted
March 8, 2023
Operation
Air carrier
Aircraft
N218WN
Make and model
Boeing 7377H4
Aircraft serial
32489
Aircraft time
58,667 hours, 35,279 cycles
Part
Beam
Condition
Corroded
Location
Zn 100 Fus Lower
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

AFT PASSENGER COMPARTMENT FLOOR STRUCTURE - WET AREA; FLOOR BEAM STA 986.5; LBL 45; FOUND CORROSION AROUND FASTENER HOLE.<[01] REMOVED NUTPLATE AT CABIN PASSENGER FLOOR STRUCTURE- WET AREA FLOOR BEAM STA 986.5; LBL 45 AS PER SRM 51-40-02-0G-0;[16] FABRICATED REPAIR PARTS. STRAP; ANGLE AND FILLER AS PER SRM 53-70-51-2R-6 TABLE 204;[17] VERIFIED STEP 16. VERIFIED FABRICATION OF REPAIR PARTS.;[18] TREATED AND PRIMED REPAIR PARTS AND BARE METAL OF THE REPAIR AREA AS PER AMM 51-21-41-370-801 AND AMM 51-21-72-370-804;[19] REINSTALLED NUTPLATE REMOVED IN STEP 1 AS PER SRM 51-40-02-0G-0;[20] VERIFIED STEPS 18 AND 19. OK TO INSTALL FABRICATED PARTS.;[21] INSTALLED FABRICATED PARTS AS PER REFERENCE SRM 53-70-51-2R-6; FIGURE 205; ALTERNATIVE 4.;[22] VERIFIED STEP 21 .;[23] REMOVED CORROSION; EVALUATED REWORKED AREA. ORIGINAL THICKNESS 0.150'; MATERIAL LOST 0.110'; MATERIAL REMAINING 0.040'. FOUND OUT OF LIMITS; FABRICATED; TREATED; PRIMED AND INSTALLED REPAIR PARTS. STRAP; ANGLE AND FILLER AS PER SRM 53-70-51-2R-6 TABLE 204.SRM 53-70-51-1A-1;[24] VERIFIED STEP 23 AS FINAL.

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