Service difficulty report · Stiffener · Boeing 737

Difficulty date
January 25, 2022
Submitted
April 4, 2022
Operation
Air carrier
Aircraft
N7730A
Make and model
Boeing 737
Aircraft serial
33926
Aircraft time
51,354 hours, 27,779 cycles
Part
Stiffener
Condition
Cracked
Location
L/H Horiz. Stab.
Stage of operation
UK
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

L/H HORIZ. STAB RIB AT STAB STA 129.50 HAS A CRACK AT 2ND VERT STIFFENER. / [01] VERIFIED APPLICABILITY OF SRM 55-10-09-2R-4.;[13] ACCOMPLISHED A GVI ON ALL AREAS WITHIN REPAIR AREA FOR CORROSION; EXISTING REPAIRS OR ANY OTHER DEFECTS. NO DISCREPANCIES FOUND IAW SRM 55-10-09-2R-5 STEP 4.F.;[14] FABRICATED REPAIR PARTS; T-SECTION 7075-T76511 0.063' THICK LOT # 1430775-2; ANGLE BAC1490 7075-T62 0.063' THICK LOT # 1464923-1; FILLER 7075-T6 0.050' THICK LOT # 1376846-2; SHIM (2EA) 7075-T6 0.016' THICK LOT # 1439717-1 IAW SRM 55-10-09-2R-5 STEP 4. G - K.;[15] APPLIED CHEMICAL CONVERSION COATING TO REPAIR PARTS; BARE SURFACES AND EDGES OF THE RIB IAW SRM 55-10-09-2R-5 STEP 4.L.;[16] VERIFIED CORRECTIVE ACTION 14 AND 15;[17] APPLIED PRIMER TO REPAIR PARTS; BARE SURFACES AND CUT EDGES OF THE RIB IAW SRM 55-10-09-2R-5 STEP 4.M. OK TO INSTALL.;[18] VERIFIED CORRECTIVE ACTION 17 OK TO INSTALL;[19] INSTALLED REPAIR PARTS AND APPLIED FILLET SEAL TO REPAIR PARTS IAW SRM 55-10-09-2R-5 STEP 4. N - R.;[20] VERIFIED INSTALLATION OF REPAIR PARTS AND APPLIED FILLET SEAL TO REPAIR PARTS IAW SRM 55-10-09-2R-5 STEP 4. N - R.;[21] VERIFIED JOB COMPLETE;[22] VERIFIED JOB COMPLETE