Service difficulty report · None · Boeing 737

Difficulty date
April 19, 2022
Submitted
May 3, 2022
Operation
Air carrier
Aircraft
N478WN
Make and model
Boeing 737
Aircraft serial
33989
Aircraft time
59,846 hours, 35,439 cycles
Part
None
Condition
Cracked
Location
R/H Wing
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

SUPPLEMENTAL INFORMATION: CRACK FOUND AT RIGHT I/B MAIN FLAP LOWER SURFACE AT REWORKED AREA 29.5 INCHES FROM O/B EDGE AND 4.5' FROM TRAILIN EDGE . DOT 15. / [01] MEASUREMENTS;[02] CUT OUT DENT CRACK DAMAGE SIZE 1.250 DIA. NO CORE DAMAGE; PERFORMED DRY OUT ON REPAIR AREA FOUND NO WATER ON R/W I/B MAIN FLAP LOWER SURFACE 29.5' FROM O/B EDGE AND 4.5 FROM T/E AS PER B737 SRM 51-70-10-2R-4;[03] FABRICATE FILLER AND DOUBLER ; CLEANED PARTS WITH BOEGEL AC-130 AND APPLIED ADHESIVE PRIMER BR127 AS PER B737 SRM 51-70-10-2R-4 MATERIALS USED PO# 1672474; PO#1717122; PO#1739742;[04] ACCOMPLISHED TRAILING EDGE FLAP SYSTEM DEACTIVATION . INSTALLED LOCK ON FLIGHT CONTROL FLAP SHUTOFF VALVE REF B737-700 AMM 27-51-00-040-801;[05] VERIFIED STEPS # 1; 2; 3; AND 4;[06] OK TO INSTALL REPAIR;[07] REPAIRED DENT CRACK DAMAGE WITH A PERMANENT HOT BOND REPAIR ON R/W I/B MAIN FLAP LOWER SURFACE AT 29.5' FROM O/B EDGE AND 4.5' FROM T/E AS PER B737 SRM 51-70-10-2R-4 MATERIALS USED PO#1717122; PO# 1723249; PO#1672474; AND PO# 173974;[08] PERFORMED TAP TEST ON REPAIRED AREA FOUND NO DELAMINATION ASPER B737 NDT 51-05-01 SECTION5;[09] PAINTED REPAIR AREA AT R/W I/B MAIN FLAP LOWER SURFACE PER B737 AMM 51-21-300-802 PO#1750464;[10] VERIFIED 7-9.;[11] ADDITIONAL REFFRENCE IN STEP 2 : B737 SRM 57-53-01-2R-7 PARAGRAPH 4.B