Transcript ABS Spar Web Investigation

ABS Spar Web
Investigation
Report to Wichita ACO/
FAA Small Airplane Directorate
Wichita, Kansas
July 23, 2009
ABS-ASF Proprietary Data
7/23/2009
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Mandatory 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
ABS-ASF Proprietary Data
7/23/2009
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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
ABS-ASF Proprietary Data
7/23/2009
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ABS-ASF Proprietary Data
7/23/2009
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Current AD Inspection
• Initial inspection
@1500TT
• No cracks: every
500 hours
thereafter
• Small cracks:
every 200 hours
thereafter
ABS-ASF Proprietary Data
7/23/2009
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ABS-ASF Proprietary Data
7/23/2009
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ABS Member Survey
Survey
Reported
%
Model
35 (O/IO470)
Responses
Cracks
Cracked
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
Notes
ABS-ASF Proprietary Data
7/23/2009
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Location of Cracks
140
120
117
100
80
58
60
42
40
20
12
5
0
Total
Front only
Front and rear
ABS-ASF Proprietary Data
7/23/2009
Rear only
Not reported
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ABS-ASF Proprietary Data
7/23/2009
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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.
ABS-ASF Proprietary Data
7/23/2009
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ABS Position
• Known issue for two
decades
• No history of inflight failure
• Current inspection
process has ensured
ongoing safety
• ABS asked FAA for
time to investigate
ABS-ASF Proprietary Data
7/23/2009
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