Service difficulty report · Rib · Boeing 737

Difficulty date
March 8, 2022
Submitted
April 11, 2022
Operation
Air carrier
Aircraft
N468WN
Make and model
Boeing 737
Aircraft serial
33858
Aircraft time
58,378 hours, 34,580 cycles
Part
Rib
Condition
Cracked
Location
R/H Horiz. Stab.
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

CRACKED RIB FLANGE ON RT. HORIZ. STAB. REMOVEABLE LEADING EDGE AT L/E STA. 105.26 CRACKED RIB FLANGE ON RT. HORIZ. STAB LEADING EDGE AT L/E STA.105.26 / [01] REMOVED RT HORIZ. STAB RIB ASSY. AT L/E STA 105.26 IAW SRM 51-40-02 AND DWG 186A1304.;[02] RT HORIZ. STAB L/E RIB AT L/E STA 105.26 WAS FABRICATED ON RO NO: 862678-SWA.;[03] DRILLED FASTENER HOLES IN FABRICATED RIB CHORD IAW SRM 51-40-05-0G-0 FIG 3 SHEET 1; BAC DRAWING 186A1001; AND BAC DRAWING 186A1304.;[04] VERIFIED PART FABRICATION AND DRILL UP FOR CORRECTIVE ACTION ITEMS 2 AND 3.;[05] APPLIED CHEMICAL CONVERSION COATING TO FABRICATED RIB CHORD IAW AMM 51-21-41-370-802 PARA 3E. AND BAC DRAWING 186A1352.;[06] VERIFIED CORRECTIVE ACTION ITEM 5.;[07] VERIFIED APPLICABILITY OF SRM 51-10-02-0G-0 PARA 9.;[08] CONCURRED WITH APPLICABILITY OF SRM 51-10-02-0G-0 PARA 9 FOR THIS REPAIR.;[09] PRIMED FABRICATED RIB CHORD IAW AMM 51-21-72-370-804 PARA 5E AND BAC DRAWING 186A1352. OK TO ASSEMBLE RIB AND INSTALL RIB INTO L/E ASSY.;[10] VERIFIED CORRECTIVE ACTION ITEM 9.;[11] INSTALLED WEB ONTO RIB CHORD AND INSTALLED RIB ASSY INTO L/E AASY IAW SRM 51-40-02-0G-0 PARA 4 AND BAC DRAWINGS #186A1304 & 186A1001.;[12] VERIFIED INSTALLATION OF CHORD AND RIB ASSEMBLY. VERIFIED CORRECTIVE ACTION ITEM 11.;[13] UPDATED MEASUREMENTS TASK COMPLETE;[14] VERIFIED JOB COMPLETE