AD NUMBER: 2006-07-15
MANUFACTURER: Thrush Aircraft Inc.
SUBJECT: Airworthiness Directive 2006-07-15 SUMMARY: The FAA is
adopting a new airworthiness directive (AD) to supersede AD
2003-07-01, whichapplies to certain Thrush Aircraft, Inc. Model 600
S2D and S2R (S -2R) series airplanes (type certificate previously
held by Quality Aerospace, Inc. and Ayres Corporation). AD
2003-07-01 currently requires you to repetitively inspect the
1/4-inch and 5/16-inch bolt hole areas on thelower wing spar caps
for fatigue cracking; replace or repair any lower wing spar cap
where fatigue cracking is found; and report any fatigue cracking
found. This AD is the result of the analysis of data from 112
cracks found in the last 8 years on similar design Model 600 S2D
and S2R (S-2R)series airplanes, and FAA's determination that an
immediate initial inspection and more frequentrepetitive
inspections are necessary to address the unsafe condition for
certain airplanes. Consequently, this AD would require you to
increase the frequency of the repetitive inspectionson Groups 1, 2,
3, and 6 airplanes; and decrease the hours time-in-service (TIS)
for the initial inspection on Group 2 airplanes. We are issuing
this AD to prevent lower wing spar cap failure caused by undetected
fatigue cracks. Such failure could result in loss of a wing with
consequent loss of airplane control.
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