Service difficulty report · Floorbeam · Boeing 7377H4

Difficulty date
April 27, 2022
Submitted
May 31, 2022
Operation
Air carrier
Aircraft
N479WN
Make and model
Boeing 7377H4
Aircraft serial
33990
Aircraft time
59,976 hours, 35,850 cycles
Part
Floorbeam
Part number
147A55062
Condition
Corroded
Location
L2 Door
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

FLOOR SUPPORT BEAM HAS SPOT OF CORROSION IN FRONT TO L2 DOOR STA 986.5 / REMOVED CORROSION AT FLOOR SUPPORT BEAM IN FRONT TO L2 DOOR STA 986.5 LBL45 IAW B737-700 SRM 51-10-02-0G-0.MATERIAL REMAINING 0.082 FOUND OUT OF LIMITS IAW B737-700 SRM 53-70-51-1A-1 FIG. 103 A-A. CUT AND REMOVED THE DAMAGE FLANGES AT UPPER CHORD OF FLOOR BEAM IN REF B737-700 SRM 53-70-51-2R-4 PARAGRAPH 4.B.LOCATED AND DRILLED REPAIR SPLICES ON FLOOR BEAM STA 986.5 AT LBL 7.93; PER REF 737-700 SRM 53-70-51-2R-4 AND 51-40-05-0G-0;SPLICES REPAIR AT FLOOR BEAM STA. 986.5 INSTALLED L/H SIDE OF T CHORD SECTION FROM LBL 7.93 TO LBL 68; AND REPAIR SPLICES AT LBL 7.93 PER REF. 737-700 SRM 53-70-51-2R-4 REP. 4 FIG.204 LOCTED AND DRILLD CORNER FITTINGS AT INTERCOSTAL REPAIR REF USED SRM 53-70-51-2R-4 FIG 207. TREATED AND PRIME INTERCOSTAL REPAIR REF USED SRM 51-20-01-0G-0 AND 53-70-51-2R-4

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