Service difficulty report · Stiffener · Boeing 7377H4

Difficulty date
July 3, 2023
Submitted
August 29, 2023
Operation
Air carrier
Aircraft
N297WN
Make and model
Boeing 7377H4
Aircraft serial
32542
Aircraft time
51,861 hours, 31,224 cycles
Part
Stiffener
Part number
UNKNOWN
Condition
Cracked
Location
Zn 300 Stabilize
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

#3 STIFFENER IS CRACKED ON RH HORIZ STAB #4 RIB STAB STA 120.3.<DISPLACED WEB FRONT AREA ON RH HORIZ STAB STA 120.3 PER SRM 51-40-02;REMOVED RH HORIZ STAB #4 RIB STA 120.3 PER SRM 51-40-02 AND SRM 55-10-09-2R-4;CUT AND REMOVED DAMAGED AREA AT #3 STIFFENER RH HORIZ STAB #4 RIB STA 120.3 PER SRM 55-10-09-2R-4 REP. 4;[05] REQUEST HFEC CRACK FREE CONDITION ON TRIMED AREA PER SRM 55-10-09-2R-4;[06] ACCOMPLISHED HFEC SURFACE SCAN IAW 737 NDTM PART 6 CHAPTER 51-00-00 PROCEDURE 23. 2EA CRACK NOTED BELOW #3 STIFFENER; MARKED AND MEASURED AT 0.3'L; AND 0.5'L CUT AND REMOVED DAMAGED AREA BELOW #3 STIFFENER RH HORIZ STAB 34 RIB STAB STA 120.3 PER SRM 55-10-09-2R-4 REP.5;CUT AND REMOVED DAMAGED AREA BELOW #3 STIFFENER RH HORIZ STAB #4 RIB STAB STA 120.3 PER SRM 55-10-09-2R-4 REP.5;FABRICATED REPAIR PARTS: (1) T-SECTION FROM 60-5872#7075T76511; LOT# 1509308-1; (2) ANGLE FROM BAC1490-2793#7075T62; LOT# 1491233-1; (3) FILLER FROM 7075 T6 0.050' CLAD; LOT# 1505777-1; (4) SHIM FROM 7075 T6 0.020' CLAD; LOT# 1381332-1; INSTALLED REPAIR PARTS ON R/H HORIZ STAB #4 RIB STAB STA 120.3; PER SRM 55-10-09-2R-5; STEP 4.N - R. INSTALLED RH HORIZ STAB #4 RIB STA 120.3 IAW SRM 51-40-02 AND DWG 182A3001; DWG 182A1500<INSTALLED WEB FRONTAL ON AREA RH HORIZ STAB FROM STA 111.10 TO STA 138.70 IAW SRM 51-40-02 AND DWG 182A2401 REPAIRED #3 STIFFENER ON RH HORZ. STAB #4 RIB PER SRM 55-10-09-2R-5

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