Service difficulty report · Intercostal · Boeing 7378H4

Difficulty date
October 6, 2022
Submitted
October 28, 2022
Operation
Air carrier
Aircraft
N8654B
Make and model
Boeing 7378H4
Aircraft serial
37045
Aircraft time
27,109 hours, 12,549 cycles
Part
Intercostal
Condition
Corroded
Location
Zn 100 Fus Lower
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

CABIN INTERCOAST UPPER SURFACE HAS CORROSION BETWEEN STA 294.5 TO STA 312 LBL 10 WL 208. / FOUND TO BE OUT OF LIMITS PER REF SRM 53-10-51-1A-1 AND DWG #141A5690.;[06] PARTIALLY REMOVED OUT OF LIMITS INTERCOASTAL BETWEEN STA 294.5 TO STA 312 LBL 10 WL 208 IN REF WITH 51-40-02-0G-0. ADDITIONALLY; PARTIALLY REMOVED FWD SIDE ADJACENT FLOOR BEAM FOR ACCESS TO HARDWARE REMOVAL.;[07] COMPLETED REMOVAL OF OUT OF LIMITS INTERCOASTAL BETWEEN STA 294.5 TO STA 312 LBL 10 WL 208; AND ADDITIONALLY REMOVED I/B SIDE BEAM SMALL ANGLE LBL 9' (FOR ACCESS) IN REFERENCE WITH 51-40-02-0G-0.;[08] LOCATED AND DRILLED HOLES ONTO NEW INTERCOASTAL IN REFERENCE WITH SRM 51-40-05-0G-0; AND SRM 51-40-06-0G-0.;[09] INSP/ VERIFIED;[10] IN ADDITION TO STEP #9 ABOVE; AMT ( OK TO TREAT & PRIME ) ALL DRILLED HOLES.;[11] TREATED AND PRIMED ALL HOLES ONTO NEW INTERCOASTAL IN REFERENCE WITH AMM 51-21-41-370-803 AND AMM 51-21-72-370-804.;LOCATED AND DRILLED HOLES ONTO NEW INTERCOASTAL IN REFERENCE WITH SRM 51-40-05-0G-0 AND SRM 51-40-06-0G-0.;[16] OK TO INSTALL NEW INTERCOSTAL;BETWEEN STA 294.5 TO STA 312 LBL 10.;[17] PARTIALLY INSTALLED NEW INTERCOASTAL. AS PER SRM 51-40-02-0G-0.;[18] INSTALLED MISSING NUTPLATE FOR LAB SUPPORT FITTING INTERCOASTAL PER SRM 51-40-02-0G-0.;[19] FINALIZED INSTALLATION OF NEW INTERCOASTAL PART# 141A5690U1 AT CABIN FWD WET AREA BETWEEN STA 294.5 TO STA 312 LBL 10 WL 208.

More about the Boeing 737-8H4