Service difficulty report · Doubler · Boeing 7377H4

Difficulty date
September 27, 2023
Submitted
October 20, 2023
Operation
Air carrier
Aircraft
N409WN
Make and model
Boeing 7377H4
Aircraft serial
27896
Aircraft time
72,749 hours, 43,518 cycles
Part
Doubler
Part number
UNKNOWN
Condition
Cracked
Location
Zn 500 Left 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

L/H WING LOWER SURFACE OF L/E SLAT NOSE SKIN AT ACTUATOR #2 HAS A SUSPECTED CRACK AT FASTENER (MARKED)<[01] UPDATED STEPS 2-4.;[02] REQ. HFEC FOR ALL INITIAL FASTENER HOLES IN THE NOSE SKIN AND THE UNDERLYING STRUCTURE FOR DAMAGE.;[03] VERIFIED STEP 7 IN PARTIAL.;[04] VERIFIED STEP 7 IN PARTIAL.;[05] COMPLETED STEP 2.<BR>UPDATED STEP 7 IN PARTIAL.;[06] REPAIRED L/H WING LOWER SURFACE OF L/E SLAT NOSE SKIN AT ACTUATOR #2 IAW SRM 57-42-01-2R-8; REPAIR 8.<BR>ACCOMPLISHED HFEC IAW 737 NDTM PART 6 CHAPTER 51-00-00 PROCEDURE 23. VERIFIED CRACK EXISTS; MEASURED AT L:0.1'. NO CRACKS ALLOWED ON FASTENER HOLES AND SLAT SKIN IS OUT OF LIMITS IAW SRM 57-42-01-1A-1; PARR. 4.A.(1)(A); FIG. 105; DETAILS A AND B.<BR>ACCOMPLISHED HFEC INSPECTION OF INITIAL FASTENER HOLES IAW 737 NDTM PART 6 CHAPTER 51-00-00 PROCEDURE 16. NO CRACKS NOTED.<BR>FABRICATED [1] DOUBLER FROM 7075-T6 ALCLAD 0.071'; LOT 1533931-2 AND [2] FILLER FROM 7075-T6 ALCLAD 0.063'; LOT 1487048-1. APPLIED TREATMENT PER SRM 51-20-01 AND SOPM 20-41-02 TO THE REPAIR PARTS AND INSTALLED IAW SRM 57-42-01-2R-8; REPAIR 8 AND SRM 51-40-02-0G-0.;[07] ITEM 1 ON STEPS 6; 7; 8; AND 9 HAD THE INCORRECT LABOR ROW SELECTED DURING INSPECTION BUYBACK THESE ITEMS ARE NOT RII.;[08] VERIFIED JOB COMPLETE

More about the Boeing 737-7H4