Service difficulty report · Floorbeam · Boeing 7378H4

Difficulty date
April 24, 2023
Submitted
May 25, 2023
Operation
Air carrier
Aircraft
N8539V
Make and model
Boeing 7378H4
Aircraft serial
42534
Aircraft time
19,572 hours, 9,642 cycles
Part
Floorbeam
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

CORROSION ON FORWARD EDGE OF STA 947 FLOORBEAM UPPER FLANGE AT LBL 24.75; FORWARD OF AFT LAV INBOARD; AFT TIEDOWN FITTING<[01] REMOVED L/H LAV INBOARD AFT TIEDOWN FITTING TO FOM;[02] REMOVED CORROSION AND FOUND TO BE OUT OF LIMITS PER SRM 53-70-51-1A-1. FAILED LIMITS DUE TO FASTENER EDGE DISTANCE ISSUE.;[03] VERIFIED CORROSION REMOVAL; OUT OF LIMITS;[04] REMOVED UPPER T-CAP OF CORRODED FLOOR BEAM FROM LBL 8? TO LBL 40? AND FLAP-PEENED CUT EDGES PER SRM 53-70-51-2R-5;[05] INSPECTION C/W REMOVED UPPER T-CAP OF CORRODED FLOOR BEAM FROM LBL 8? TO LBL 40? AND FLAP-PEENED CUT EDGES PER SRM 53-70-51-2R-5;[06] FABRICATED; DRILLED AND TRIMMED REPAIR PARTS PER SRM 53-70-51-2R-5. ALSO FLAP PEENED TRIMMED EDGES OF REPLACEMENT T-CAP PER SRM 53-70-51-2R-5. OK TO ALODINE AND PRIME.;[07] GREGORY BAXTER (TECHNICIAN); 03-MAY-2023 17:30 UTC<BR>FABRICATED; DRILLED AND TRIMMED REPAIR PARTS PER SRM 53-70-51-2R-5. ALSO FLAP PEENED TRIMMED EDGES OF REPLACEMENT T-CAP PER SRM 53-70-51-2R-5. OK TO ALODINE AND PRIME.;[08] ALODINED AND PRIMED REPAIR PARTS AND TRIMMED OUT BEAM PER AMM 51-21-41 AND AMM 51-21-71;[09] C/W INSP ALODINED AND PRIMED REPAIR PARTS AND TRIMMED OUT BEAM PER AMM 51-21-41 AND AMM 51-21-71;[10] INSTALLED REPAIRED PARTS PER SRM 53-70-51-2R-5.AND EA # 23-153-01432 LINE #2491;[11] C/W INSPECTION.;[12] INSTALLED FLOOR SUPPORTS AT LBL 18 PER SRM 51-40-02.

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