Service difficulty report · Exhaust Mixer · Raythn 400ARAYTHEON

Difficulty date
April 9, 2021
Submitted
April 13, 2021
Operation
General aviation
Filed by
PAIR208A
Signature Flight Support LLC
Aircraft
N339SM
Make and model
Raythn 400ARAYTHEON
Aircraft serial
RK458
Aircraft time
5,609 hours, 4,898 cycles
Engine
Wilint FJ443A
Engine time
1,928 hours, 1,618 cycles
Part
Exhaust Mixer
Part number
69290
Part serial
NSN
Condition
Cracked
Location
Zone 400
Part time
1,928 hours, 1,618 cycles
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

DURING PILOTS PRE-FLIGHT INSPECTION A PORTION OF THE MIXER CASE ASSEMBLY WAS OBSERVED IN THE FAN AIR BYPASS DUCT OF THE RIGHT HAND ENGINE. FURTHER INVESTIGATION DISCOVERED MULTIPLE CRACKS AND MISSING SECTIONS OF THE ASSEMBLY. THE LEFT HAND ENGINE MIXER CASE ASSEMBLY WAS OBSERVED TO HAVE CRACKING AND MISSING SECTIONS AS WELL.