Service difficulty report · Stiffener · Boeing 7377H4

Difficulty date
January 26, 2023
Submitted
March 6, 2023
Operation
Air carrier
Aircraft
N955WN
Make and model
Boeing 7377H4
Aircraft serial
36671
Aircraft time
38,739 hours, 23,607 cycles
Part
Stiffener
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

CRACK ON HORIZONTAL STABILIZER RIB STIFFENER AT R/H RIB 5 STAB STA 129.50 3RD FROM FWD.<[01] UPDATE MEASUREMENTS TABLE.;[02] VERIFY APPLICABLE SRM REPAIR (B737-700 SRM 55-10-09-2R-4 REPAIR 4 EFFECTIVITY ALL) FOR THE R/H HORIZONTAL STAB INSPAR RIB.;[03] TRIMMED DAMAGE AREA ON INSPAR RIB PER B737-700 SRM 55-10-09-2R-4 REPAIR 4 REQUIRE HFEC INSPECTION; HFEC OPEN HOLES ON REPAIR AREA AND DVI PER SRM REPAIR INSTRUCTIONS STEP 4.C.D. AND E.;[04] CERTIFY;[05] HFEC INSPECTED TRIMMED EDGES AND SURFACE OF DAMAGE CUTOUT AND OPEN HOLES PER 737NDT PART 6 51-00-00 PROCEDURES 23 AND 16. NO CRACKS FOUND. TOOL N500 IS000681 DUE 02/2023.<BR><BR>ACCOMPLISHED DVI OF REPAIR AREA PER SRM 55-10-09-2R-4. NO ADDITIONAL DAMAGE FOUND.<BR><BR>VERIFIED MEASUREMENTS TABLE.;11] FABRICATED NEW REPAIR PARTS FILLER; L-ANGLE AND T-SECTION AND LOCATED AND DRILLED NEW REPAIR PARTS FOR R/H INSPAR RIB STIFFENER AT RIB 129.50 PER B737-700 SRM 55-10-09-2R-4 REPAIR 4.;[12] TREATED NEW REPAIR PARTS PER B737-700 SRM 51-20-01 OK TO PRIME NEW REPAIR PARTS FILLERS; L-ANGLE AND T-SECTION.;[13] CERTIFY;[14] INSPECTED ACTION 11-13; OK TO PRIME;[15] APPLIED PRIMER TO REPAIR PARTS PER SOPM 20-41-02; OK TO INSTALL.;[16] VERIFIED CORRECTIVE ACTION #15 OK TO INSTALL;[17] INSTALLED REPAIR PARTS ON HORIZONTAL STABILIZER RIB STIFFENER AT R/H RIB 5 STAB STA 129.50 3RD FROM FWD IAW SRM 55-10-09-2R-4.;[18] CERTIFIED CORRECTIVE ACTION 17;[19] VERIFIED CORRECTIVE ACTION #17;[20] CARD COMPLETE

More about the Boeing 737-7H4