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ABS Spar Web ABS Spar Web InvestigationInvestigation
Report to Wichita ACO/
FAA Small Airplane Directorate
Wichita, Kansas
July 23, 2009
1ABS-ASF Proprietary Data 7/23/2009
Mandatory Service BulletinsMandatory Service Bulletins
• MSB 2269 issued August 1989– Barons (except 58P and 58TC)– Travel Airs
• MSB 2360 issued November 1990– Bonanzas H35 and later– All Model 33 Debonairs/Bonanzas – All Model 36 Bonanzas
• Required inspection and repairs
2ABS-ASF Proprietary Data 7/23/2009
Airworthiness Directives
• AD 90-08-14– Incorporates MSB 2269 (multiengine)
• AD 92-08-07– Incorporates MSB 2360 (singe engine)– One time inspection– Required reporting to Beech
• No record of any data
• AD 95-04-03 – Repetitive inspections– No reporting
3ABS-ASF Proprietary Data 7/23/2009
Current AD InspCurrent AD Inspectionection
• Initial inspection @1500TT
• No cracks: every 500 hours thereafter
• Small cracks: every 200 hours thereafter
5ABS-ASF Proprietary Data 7/23/2009
Survey Reported %
Model Responses Cracks Cracked Notes 35 (O/IO-
470) 328 1 0.3% Short body, <3300 MGW
35 (IO-520) 538 19 3.5% Short body, 3300 MGW or greater
33 (IO-470) 163 4 2.5% Short body, <3300 MGW
33 (IO-520) 182 8 4.4% Short body, 3300 MGW or greater
36 25 4 16.0% Long body, MGW 3600 lbs
A36 232 30 12.9% Long body, MGW 3600 lbs (3650 lbs 1984 and later)
A36TC 21 0 0.0% Long body, MGW 3600 lbs
B36TC 21 2 9.5% Long body, MGW 3850 lbs
Baron 55/56 218 34 15.6% Short body, twin-engine
Baron 58 41 14 34.1% Long body, twin engine
95 9 1 11.1% Short body, twin-engine
ABS Member Survey ABS Member Survey
7ABS-ASF Proprietary Data 7/23/2009
FAA No-Crack Policy
• The Old Policy– For cracks found in structural components some ADs
have allowed continued operational flight if the cracks are smaller than a certain size.
– Inspection requirements will be more stringent for known cracks.
• The New Policy– Continued operational flight with known cracks in
primary structural components should not be allowed.
– Small Airplane Directorate will adhere to this basic policy.
10ABS-ASF Proprietary Data 7/23/2009