Service difficulty report · Fuel Control · Bolkms BK117C2

Difficulty date
November 16, 2021
Submitted
November 16, 2021
Operation
General aviation
Filed by
QR9R369D
M1 Support Services
Make and model
Bolkms BK117C2
Aircraft serial
15723989780
Aircraft time
1,948 hours
Part
Fuel Control
Part number
0164851980
Part serial
1712
Condition
Split
Part time
1,585 hours
Stage of operation
HO
How discovered
V
Nature of condition
F
Precautionary procedure
C

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

What was found

VARTOMS FLUCTUATIONS OF +/- 3 FLI DIFFERENCE BETWEEN #1 AND #2 WITH VARNR KICKING OFF. COULDN'T MANUALLY TO MATCH ,BUT ONCE VARNR RESET IT WOULD KICK OFF AGAIN WITH SPLIT IN FLI. IT HAPPENED 3 TIMES IN A ROW AND EITHER FLI NEEDLE WOULD GO HIGH (NOT JUST #1 OR #2). COMPLETED MTF TO TROUBLESHOOT VARTOMS/TQ FLUCTUATIONS: IN NORMAL VARTOMS MODE, BOTH FLI NEEDLES FLUCTUATED EXCESSIVELY DURING FLIGHT AND REPEATEDLY CAUSED THE SYSTEM TO QUICKLY REVERT TO MANUAL MODE. IN MANUAL VARTOMS MODE, #2 ENGINE SIGNIFICANTLY LAGGED BEHIND #1 ENGINE DURING POWER APPLICATIONS. SUSPECT FAULTY #2 FUEL CONTROL. REPLACED #2 ENGINE FCU IAW ARRIEL 1 E2 73-21-00-900-801.