Service difficulty report · Frame · Bolkms BK117C2

Difficulty date
October 18, 2021
Submitted
October 18, 2021
Operation
Air carrier
Aircraft
N911TB
Make and model
Bolkms BK117C2
Aircraft serial
9281
Aircraft time
4,557 hours, 10,167 cycles
Part
Frame
Part number
B533K5107201
Condition
Cracked
Location
Bs 4100
Part time
4,557 hours, 10,167 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

STRUCTURAL DAMAGE IN THE FORM OF MULTIPLE CRACKS IN THE AFT WEB (PN B533K5107-201) OF FWD LH BOX BEAM. THERE IS ALSO A CRACK ACROSS THE LH STA4135 L-EXTRUSION (PN: B533K5140- 204), AS WELL AS THE STA4035-4135 BOX FRAME INNER SKIN (COVER) (PN: B533K5605-201). THIS AIRCRAFT HAS BEEN PREVIOUSLY MODIFIED WITH A AIRMETHODS WINDOW MOUNT I/A/W STC SR00592DE-D FILED ON FAA FORM 337 DATED DEC. 14, 2009.