Service difficulty report · Intercostal · Boeing 7472D7B

Difficulty date
June 29, 2010
Submitted
July 1, 2010
Operation
Air carrier
Aircraft
N523MC
Make and model
Boeing 7472D7B
Aircraft serial
21782
Aircraft time
100,704 hours, 20,573 cycles
Part
Intercostal
Condition
Cracked
Location
Bs 260
Stage of operation
IN
How discovered
V
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

DURING C-CHECK, THE INTERCOSTAL WAS CRACKED LOCATED COMMON TO THE FWD CANTED BULKHEAD WEB AT BS260 RBL 10 TO RBL 22 AND WL 188 TO WL 189. (THE CRACK WAS TRIMMED OUT AND REPAIRED WITH AN ANGLE AND FILLER AS DOUMENTED ON IAI NRC963 IAW SRM 51-40-03, FIG 1. THE 65B07394-1054 INTERCOSTAL IS MADE FROM 0.040 INCH THICK CLAD7075-T6 PER SRM 53-10-20 FIG 10 DETAIL II ITEM 35. SEE FIG 1. THE REPAIR PARTS CONSISTED OF AN 0.050 INCH THICK ANGLE 12 IN BY 4 IN FROM 7075-T6 ALUMINUM AND A FILLER ALL INSTALLED WITH BACR15BB5D RIVETS)

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