AND CENTERING UNIT - INSPECTION AND REPLACEMENT OF SPRING ASSEMBLY. SERVICE BULLETIN NOT APPLICABLE - BY EFFECTIVITY APPLICABLE TO 737-800 SERIES AIRCRFAT ONLY. - N/A BY LINE NO. MOS 03-NOV-2009 16-APR-2008 3391 AFL 817 SB 737-27A1296 ELAVATOR TAB CONTROL MECHANISM DETAILED INSPECTION (SUPERS