5059 AFL 1943 WO 1.14 MOS INSP (212012) SL 737-SL-53-050 POSSIBLE CRACKS IN THE COUNTERSINKS OF FASTNER HOLES COMMON TO FRONT SPAR TO REAR SPAR UNDERWING PANELS, SERVICE LETTER INFORMATIONAL MOS 72 30-MAR-2012 30-MAR-2016 238d 30-MAR-2018 HRSi'MSC 5059 AFL 1943 REF: BULLETINS WO 1.14 MOS INSP (2/

l Compliance Next Due Disposition MOC SL 737-SL-53-050 POSSIBLE CRACKS IN THE COUNTERSINKS OF FASTNER HOLES COMMON TO FRONT SPAR TO REAR SPAR UNDERWING PANELS. SERVICE LETTER MOS 72 (s) 08-OCT-1999 20-SEP-2000 SL 737-SL-53-051 SKIN PANEL ASSEMBLY REPLACEMENT4AP JOINT FASTNER SIZE INSTALLATION. SERVIC