Service difficulty report · Support Channel · Boeing 7378H4

Difficulty date
July 10, 2023
Submitted
August 4, 2023
Operation
Air carrier
Aircraft
N8544Z
Make and model
Boeing 7378H4
Aircraft serial
36926
Aircraft time
19,891 hours, 9,804 cycles
Part
Support Channel
Part number
UNKNOWN
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

U CHANNEL SUPPORT HAS SURFACE CORR STA 747-767. RBL 22<[01] REMOVED CORROSION FROM INTERCOSTAL (U CHANNEL SUPPORT) STA 747- 767. ORIGINAL THICKNESS IS 0.032?; MATERIAL LOSS IS 0.004?; MAX ALLOWED IS 0.003?; REMAINING THICKNESS IS 0.028?. FOUND TO BE OUT OF LIMITS PER SRM 53-00-53-1A-2;[02] REMOVED AND REPLACED INTERCOSTAL (U CHANNEL SUPPORT) AT STA 747- 767 RBL 22 PER SRM 51-40-05 AND 51-40-02. PART WAS INCLUDED WITH THE ASSY 146A7502-31 ORDER ON TASK CARD TTG8Q00M0H7R;[03] INSPECTED AS REQUIRED; CORRECTIVE ACTION #1 AND #2. VERIFIED SUPPORT WAS INCLUDED WITH THE ASSY 146A7502-31 AND INSTALL ACCOMPLISHED ON TASK CARD TTG8Q00M0H7R

More about the Boeing 737-8H4