AD NUMBER: AD/BEECH 300/7
SUBJECT: Beechcraft 300 Series (Amendment One: Fuselage Stringers 5 Through 11 4/2005 DM)
APPLICABILITY: All models and serial numbers listed in the Requirement document, except those aircraft in which all stringers 5 through 11 on both left hand and right hand sides of
the fuselage have been modified in accordance with the requirement document.
REQUIREMENTS: 1. Inspect unmodified stringer numbers 5 to 11 on the left and right hand sides of the fuselage in accordance with Part I of Raytheon Service Bulletin SB 53-2472 Rev 4.
2. Modify all cracked stringers in accordance with Part II of Raytheon Service Bulletin SB 53-2472 Rev 4.
Note 1: FAA AD 2005-01-18 Amdt 39-13943 refers.
Note 2: Part III of Raytheon Service Bulletin SB 53-2472 Rev 4 provides instructions
for the removal of external doublers so that installation of the internal stringer
reinforcement kits per Requirement 2 can be accomplished.

COMPLIANCE: As detailed in the Requirement document.
This Amendment becomes effective on 10 March 2005.
BACKGROUND: The manufacturer has received and confirmed reports of cracking in stringers 5 to 11 near the rear pressure bulkhead. The cracks could affect residual strength under cabin pressure and fuselage bending loads. Amendment 1 is issued to align this Directive with the latest revision of the Requirement document and related new FAA AD.

FMI: http://casa.gov.au/airworth/airwd/NEW/urgent.htm