Service difficulty report · Bolt · Bell 222U

Difficulty date
March 13, 2015
Submitted
March 16, 2015
Operation
Air carrier
Aircraft
N427MA
Make and model
Bell 222U
Aircraft serial
47558
Aircraft time
9,467 hours
Engine
Lyc LTS101750B1
Part
Bolt
Part number
NAS626*
Condition
Sheared
Location
Main Rotor Head
Component
Mr Hub
Component part number
222012101107
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 AN AIRFRAME ZONE 1 INSPECTION, FOUND ONE SIDE OF THE MR HUB, PN 222-012-101-107 SN A98, CORD WEIGHT MOUNT LOOSE. UPON REMOVAL OF THE NUT FROM THE LONG, ALL THREAD, PORTION OF THE MOUNT & THE WEIGHT ITSELF, FOUND ONE BOLT HEAD LAYING LOOSE UNDER THE WEIGHT. THAT ONE BOLT HEAD HAD BROKEN OFF & ALSO THE BOLT PORTION HAD SHEARED AT THE SHANK THREAD JUNCTION. 3 OTHER BOLTS SHEARED AT THE SHANK THREAD JUNCTION. THE REMAINING 2 BOLTS DID NOT SHEAR, BUT THEY WERE BACKED OUT APPROX 1/8 & THE THREADS WERE DAMAGED.

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