AD NUMBER: 2008-05-06
SUBJECT: Airworthiness Directive 2008-05-06 SUMMARY: We are adopting a
new airworthiness directive (AD) for certain Boeing Model 737-100,
-200,-300, -400, and -500 series airplanes.
This AD requires repetitive inspections for fatigue cracking in
the longitudinal floor beam web, upper chord, and lower chord
located at certain body stations,and repair if necessary.
This AD results from several reports of cracks in the center
wing box longitudinal floor beams, upper chord, and lower
We are issuing this AD to detect and correct fatigue cracking of
the upper and lower chords and web of the longitudinal floor
beams,which could result in rapid loss of cabin pressure.