Service difficulty report · Unknown · Boeing 737890

Difficulty date
December 20, 2021
Submitted
December 27, 2021
Operation
Air carrier
Aircraft
N581AS
Make and model
Boeing 737890
Aircraft serial
35188
Aircraft time
51,555 hours, 15,300 cycles
Engine
Cfmint CFM567B27
Part
Unknown
Part number
UNKNOWN
Condition
Worn
Location
#2 Engine
Stage of operation
IN
How discovered
O
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

#2 ENGINE SHORT TIME FAULT MESSAGE, 75-10402 THE VSV POSITION SIGNALS DISAGREE. DEFERRED PER T/C 78273000SEA ONLY. GROUNDED - YES. PERFORMED B737-800 FIM 75-31 TASK 804 FOR BOTH A & B CHANNEL VSV POSITION SIGNALS DISAGREE. A CHANNEL ACTUATOR RESISTANCE VALUES ARE GOOD. INSPECTED A CHANNEL VSV ACTUATION SYSTEM PER FIM AND FOUND A CHANNEL ACTUATOR BELLCRANK ASSEMBLY STAGE 3 ACTUATOR ARM AND MASTER FULCRUM EXCESSIVELY WORN. REPLACED BELLCRANKS (LEFT AND RIGHT) PER B737-800 AMM 72-32-00. OPS CKS GOOD. ETOPS GROUND VERIFICATION SUCCESSFUL. ALSO ACCOMPLISHED 800-72EA-24092 TO CLARIFY REPAIR LANGUAGE FOR VSV BELLCRANK INSTALLATION.