Service difficulty report · Thermocouple · Bolkms BK117C2

Difficulty date
October 12, 2022
Submitted
October 12, 2022
Operation
General aviation
Filed by
QR9R369D
M1 Support Services
Make and model
Bolkms BK117C2
Aircraft serial
15723749753
Aircraft time
2,693 hours
Part
Thermocouple
Part number
9550179250
Part serial
4861
Condition
Failed
Location
Nr 2 Engine
Stage of operation
TX
How discovered
O
Nature of condition
N
Precautionary procedure
O

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

What was found

ENG #2 FAILED TO START, N1 DID NOT REACH 40% WITHIN 30 SECS ON 2 ATTEMPTS. DURING MTF MOC, #2 ENG START IAW RFM PILOT'S CHECKLIST - STARTING ENGINES PAGE N-19, ENGINE #2 NEEDLE RISE TO 8 FLI WITH TOT RISING TO 625 DEGREES AND THEN HOLDING, N1 RISING TO 26.6 AND HOLDING. ABORT START SEQUENCE WAS CONDUCTED AT 30 SECONDS. AVIONICS CONFORMED THAT ENGINE IGNITERS WERE OPERATIONAL DURING START SEQUENCE. REMOVED AND REPLACED ENGINE NO. 2 OUTBOARD THERMOCOUPLE; TEST FLIGHT COMPLETED IAW FLM. CHECK OK.