Service difficulty report · Thermocouple · Bolkms BK117C2

Difficulty date
August 17, 2023
Submitted
August 17, 2023
Operation
General aviation
Filed by
QR9R369D
M1 Support Services
Make and model
Bolkms BK117C2
Aircraft serial
10721329358
Aircraft time
3,401 hours
Part
Thermocouple
Part number
0177887050
Part serial
117MA
Condition
Failed
Location
Unknown
Stage of operation
TX
How discovered
V
Nature of condition
J
Precautionary procedure
C

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

DURING FLIGHT #1, FLI DEGRADED MESSAGE IN CAD FOR #2 ENG WITH TOT INDICATION. A SUBSEQUENT T/F EVAL REVEALED #2 ENGINE WOULD NOT START, NO RISE IN TOT. N1 WOULD INCREASE. 3 START ATTEMPTS PERFORMED. TOT STAYED AT 45-50 DEGREES AND N1 WOULD INCREASE TO AROUND 30% BEFORE ABORTING THE START FOR NO INCREASE IN TOT. FLI DEGRADE APPEARED DURING 3RD START. REPLACED #2 ENGINE THERMOCOUPLE JUNCTION BOX IAW 77-22-00-900-8-02-A01. MTF MOC COMPLETED, BOTH ENGINES STARTED NORMALLY.