Service difficulty report · Stiffener · Boeing 737790

Difficulty date
September 29, 2021
Submitted
November 4, 2021
Operation
Air carrier
Aircraft
N557WN
Make and model
Boeing 737790
Aircraft serial
30166
Aircraft time
66,485 hours, 32,340 cycles
Part
Stiffener
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

RIGHT HAND HORIZONTAL STABILIZER INSPAR RIB; 129.50; 3RD VERTICAL STIFFENER IS CRACKED. ; / [01] REQUEST NDI TO VERIFY RH RIB AT STAB STA 129.50;3RD VERTICAL STIFFENER CRACKED.;[11] FABRICATED REPAIR PARTS -1 T SECTION FROM 7075-T76511 0.063 INCH LOT#1463116-1;-2 ANGLE BAC1490 7075T6 0.063 INCH LOT#1464923-1;-3 FILLER 7075T6 0.050 INCH LOT# 5087747-1;-4 SHIM 7075T6 0.016 INCH LOT# 1439717-1 PER SRM 55-10-09-2R-5.; [12] REQUEST Q.C DO A GENERAL VISUAL INSPECTION OF ALL AREAS WITHIN THE REPAIR AREA PER SRM 55-10-09-2R-5.STEP 4F.; [13] VERIFIED CORRECITIVE ACTION 11 AND 12.; [14] APPLIED A CHEMICAL CONVERSION COATING TO THE REPAIR PARTS AND THE BARE SURFACES AND EDGES OF THE RIB. APPLIED ONE LAYER OF BMS 10-11; TYPE I PRIMER TO THE REPAIR PARTS AND THE BARE SURFACES AND EDGES OF THE RIB. PER SRM 55-10-09-2R-5. O.K TO INSTALL REPAIR PARTS.; [15] INSTALLED THE REPAIR PARTS WITH FASTENERS PER SRM 55-10-09-2R-5.; [16] VERIFIED CORRECTIVE ACTION 14.; [17] VERIFIED CORRECTIVE ACTION 15.