Service difficulty report · Rib · Boeing 7377H4

Difficulty date
July 20, 2023
Submitted
August 22, 2023
Operation
Air carrier
Aircraft
N292WN
Make and model
Boeing 7377H4
Aircraft serial
32538
Aircraft time
51,861 hours, 31,244 cycles
Part
Rib
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

R/H HORIZONTAL STAB RIB 5; STA 129.5 CRACKED<[01] RIB 5 IS CRACKED AT STIFFENER 3;[02] REMOVED RIGHT HORIZONTAL STABILIZER RIB 4 STA 129.50 TO ACCESS CRACK REPAIR ON 3RD VERTICAL STIFFENER FROM FRONT SPAR IAW SRM 51-40-02-0G-0.;[03] APPLICABLE REPAIR STATEMENT; APPLICABLE REPAIR FOR HORIZONTAL STABILIZER RIB CRACK ON STIFFENER TO BE USED IS SRM 55-10-09-2R-4 REPAIR 4.;[04] REMOVED CRACK DAMAGE IAW SRM 55-10-09-2R-4 PARA.4.B(1). DIMENSIONS; L= 1.70' X W= 0.050' ON THE VERTICAL STIFFENER.ACCOMPLISHED GVI ON ALL AREAS WITHIN REPAIR AREA FOR CORROSION; EXISTING REPAIRS OR ANY OTHER DEFECTS. NO DISCREPANCIES FOUND IAW SRM 55-10-09-2R-4.PARA4. E.;[09] FABRICATED REPAIR PARTS; (1)T-SECTION 7075T76511; 0.063' THICK LOT #1458457-1; (2)ANGLE BAC1490-7075T62; 0.063' THICK LOT#1491233-1; (3) SHIM 2.E.A 7075-T6; 0.016' THICK LOT#1439717-1; IAW SRM 55-10-09-24-4 PARA.4.F; G; H; I & J.;[10] APPLIED CHEMICAL CONVERSION COATING TO REPAIR PARTS; BARE SURFACES AND CUT EDGES OF THE RIB IAW SRM 55-10-09-2R-4. PARA 4.K.;[11] VERIFIED COMPLETION OF CORRECTIVE ACTIONS 9 AND 10;[12] APPLIED PRIMER TO REPAIR PARTS; BARE SURFACES AND EDGES OF THE RIB IAW SRM 55-10-09-2R-4 PARA.4.L INSTALLED RIGHT HAND HORIZONTAL STABILIZER RIB 5; STA 129.50 IAW SRM 51-40-02-0G-0 & BAC DRAWINGS #002A0001; 182A1500 & 182A3001 INSTALLED DISPLACED RIGHT HAND HORIZONTAL STABILIZER FRONT SPAR WEB AT STABILIZER STA 111.10 - 145 IAW SRM 51-40-02-0G-0 & BAC DRAWING #182A2401

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