Service difficulty report · Actuator · Boeing 737890

Difficulty date
June 29, 2021
Submitted
July 7, 2021
Operation
Air carrier
Aircraft
N533AS
Make and model
Boeing 737890
Aircraft serial
35201
Aircraft time
38,930 hours, 11,272 cycles
Part
Actuator
Part number
1211313010
Part serial
APMMT359
Condition
Faulted
Location
Nr 1 Vsv
Part time
45,104 hours, 21,623 cycles
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

DURING W/C 78273000 FOUND SHORT-TERM FAULT 75-10401: #1 ENG VSV POS SIF DISAGREE. GROUNDED - YES. ACCOMPLISHED INSPECTION OF #1 ENG VSV. FOUND MULTIPLE LOOSE, MISSING & MIGRATING BUSHINGS ON STAGE 1, 2 & 3 RINGS. FOUND (2) MISSING BUSHINGS & SEVERAL BUSHINGS WITH BROKEN LEGS WHICH ARE OK FOR SERVICE REF B737-800 MM 72-32-00-200-801-F00. REPLACED MISSING BUSHINGS REF MM 72-32-00-900-801-F00. MANUALLY ACTUATED SYSTEM REF AMM 75-31-00-790-801-F00. FOUND WORN BUSHINGS ON BELL CRANK LINKAGE. REMOVED RH VSV (BELLCRANK) ASSY. REF AMM 72-32-00-900-805-F00. REPLACED NO1 ENG RIGHT SIDE VSV BELLCRANK ASSY REF AMM 72-32-00-900-805-F00. REPLACED THE #1 ENGINE R/H VSV ACTUATOR PER B737-800 MM 72-32-00 AND MM 75-31-01.