Service difficulty report · Stiffener · Boeing 7377H4

Difficulty date
June 7, 2021
Submitted
July 19, 2021
Operation
Air carrier
Aircraft
N489WN
Make and model
Boeing 7377H4
Aircraft serial
33855
Aircraft time
54,253 hours, 32,244 cycles
Part
Stiffener
Condition
Cracked
Location
Horizontal 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

RT HORIZONTAL STAB; #1 RIB (STAB STA 92.7); #1 STIFFENER IS CRACKED AT THE LOWER END ; / [01] ITEM 1: DISPLACED FRONT SPAR WEB AT STAB STA 78-728 FOR ACCESS FOR RIB REPAIRS IAW SRM 51-40-02.<BR><BR>ITEM 2: REMOVED STAB RIB AT STAB STA 92.7 FOR ACCESS FOR RIB REPAIRS IAW SRM 51-40-02.; [02] REMOVED DAMAGE (CRACK) ON STAB RIB (STAB STA 92.7) #1 VERT STIFFENER; L=1.20' X W=0.35' IAW SRM 55-10-09-2R-4. REQUIES NDT TO VERIFIY CRACK FREE.; [03] VERIFIED REMOVED DAMAGE (CRACK) ON STAB RIB (STAB STA 92.7) #1 VERT STIFFENER; L=1.20' X W=0.35' IAW SRM 55-10-09-2R-4. REQUIES NDT TO VERIFIY CRACK FREE.; [21] REPAIRED RT HORIZONTAL STAB INSPAR RIB #1 AT STAB STA 92.70 #1 STIFFENER IAW SRM 55-10-09-2R-4; DWG #'S 182A3001; 182A1500; 182A2401; 002A0001; SRM 51-40-02-0G-0; AMM 51-31-00-390-805; [22] VERIFIED CAP SEALED RT HORIZONTAL STAB FRONT SPAR WEB FASTENERS AT STAB STA 78-129.5 IAW AMM 51-31-00-390-805. ALL STEPS COMPLETED

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