Service difficulty report · Control Box · Boeing 234

Difficulty date
July 16, 2024
Submitted
July 17, 2024
Operation
Air carrier
Aircraft
N235CH
Make and model
Boeing 234
Aircraft serial
MJ002
Aircraft time
9,582 hours
Part
Control Box
Part number
BCK121
Part serial
024
Condition
Activation Error
Location
#1 Engine
Stage of operation
TO
How discovered
O
Nature of condition
O
Precautionary procedure
D

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

What was found

SHORTLY AFTER INITIAL TAKE OFF FROM OUA, PILOT NOTED THE #1 ENGINE SOUNDING LIKE IT WAS ROLLING BACK. LOOKING AT THE GAUGES HE FOUND A 35% TORQUE SPLIT BETWEEN THE #1 AND #2 ENGINES. HE THEN PUT THE #1 ENGINE IN MANUAL AND CONTROLLED THE BEEPS FROM THERE. RETURNED THE AIRCRAFT TO BASE WHERE MAINTENANCE TOOK OVER. REMOVED, INSPECTED, CLEANED AND REINSTALLED CANNON PLUGS ON BOTH #1 AND #2 ENGINE N2 ACTUATORS. NO DEFECTS WERE NOTED. PERFORMED A CONTROLS CHECK OF THE N1 AND N2 ACTUATOR AND LOGIC CONTROL BOXES. NO DEFECTS NOTED. PERFORMED A DYNAMIC INSPECTION OF THE N2 LOGIC SYSTEM AND FOUND IT TO BE OUT OF ADJUSTMENT. ADJUSTED #1 AND #2 LOGIC CONTROL BOXES AS NECESSARY. NO FURTHER DEFECTS NOTED. AIRCRAFT WAS RETURNED TO SERVICE.

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