Service difficulty report · Beam · Cessna 402C

Difficulty date
April 21, 2026
Submitted
April 22, 2026
Operation
Air carrier
Aircraft
N4630N
Make and model
Cessna 402C
Aircraft serial
402C0001
Aircraft time
32,911 hours, 22,534 cycles
Part
Beam
Part number
56541097
Condition
Cracked
Location
Zone 400
Part time
32,911 hours, 22,534 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 A CRACK WAS VISUALLY DISCOVERED ON THE INBOARD FACE OF THE RIGHT HAND INBOARD ENGINE BEAM IN THE AREA OF THE VERTICAL ATTACH CHANNELS FOR THE CROSSOVER BEAM. THIS CRACK WAS DISCOVERED AFTER CHANGING THE CROSSOVER BEAM VERTICAL ATTACH BRACKET P/N: 5654107-15 AND THEREFORE NOT VISIBLE UNTIL THE BRACKET WAS REMOVED. THE CRACK MEASURES APPROXIMATELY 1.210 INCHES LONG, AND IS CONSISTENT WITH OTHERS FOUND IN THIS AREA USING A DETAILED VISUAL INSPECTION. THIS BEAM HAS BEEN REPLACED USING NEW PARTS.

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