Service difficulty report · Spar Cap · Cessna 402C

Difficulty date
May 17, 2019
Submitted
May 17, 2019
Operation
Air carrier
Aircraft
N3249M
Make and model
Cessna 402C
Aircraft serial
C4020296
Aircraft time
30,128 hours, 18,367 cycles
System (JASC)
5711 · Wing Spar
Part
Spar Cap
Part number
512204123
Condition
Corroded
Location
Lt Wing
Part time
30,128 hours, 18,367 cycles
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 MAINTENANCE AREAS OF CORROSION WERE IDENTIFIED ON THE LEFT HAND LOWER AFT SPAR CAP (P/N: 5122041-23) BETWEEN L.W.S. 216.71 AND 229.71. THE DEEPEST AREA OF CORROSION IS AT L.W.S. 218.71 ON THE LOWER HORIZONTAL LEG AND MEASURES APPROXIMATELY .028 INCHES DEEP. THIS IS IN EXCESS OF THE MAXIMUM REMOVABLE LIMITS ALLOWED UNDER MEB95-11R1 SECTION 3. THIS CAP WILL BE REMOVED AND REPLACED USING NEW PARTS.

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