Airworthiness directives › 2011-21-16
AD 2011-21-16 Airworthiness Directives; Diamond Aircraft Industries Powered Sailplanes
Makes named: diamond. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Diamond Aircraft Industries Model H-36 “DIMONA” powered sailplanes, all serial numbers, certificated in any category.
Compliance
Unless already done, do the following actions: (1) Within the next 6 months after November 23, 2011 (the effective date of this AD), remove, test, and inspect the air brake control system torsion tube for corrosion damage following Diamond Aircraft Industries GmbH Work Instruction WI-MSB 36-105, dated April 21, 2011, as specified in Diamond Aircraft Industries GmbH Service Bulletin No. MSB 36-105/1, dated May 2, 2011. (2) If corrosion damage is found during the inspection required in paragraph (f)(1) of this AD or during any repetitive inspection required in paragraphs (f)(2) and (f)(3) of this AD, before further flight after the inspection in which corrosion damage is found, replace the affected torsion tube with a serviceable part. Before installation, apply an anticorrosive agent to the inside of the torsion tube. Do these required actions following Diamond Aircraft Industries GmbH Work Instruction WI-MSB 36-105, dated April 21, 2011, as specified in Diamond Aircraft Industries GmbH Service Bulletin No. MSB 36-105/1, dated May 2, 2011. After replacement, repetitively thereafter at intervals not to exceed 60 months, remove, test, and inspect the newly installed air brake control system torsion tube for corrosion damage following the procedures specified in paragraph (f)(1) of this AD. (3) If no corrosion damage is found during the inspection required in paragraph (f)(1) of this AD or during any repetitive inspection required in paragraphs (f)(2) and (f)(3) of this AD, before reinstalling the torsion tube, apply an anticorrosive agent to the inside of the torsion tube. Do these required actions following Diamond Aircraft Industries GmbH Work Instruction WI-MSB 36-105, dated April 21, 2011, as specified in Diamond Aircraft Industries GmbH Service Bulletin No. MSB 36-105/1, dated May 2, 2011. Repetitively thereafter at intervals not to exceed 60 months, remove, test, and inspect the air brake control system torsion tube for corrosion damage following the procedures specified in paragraph (f)(1) of this AD. (4) As of November 23, 2011 (the effective date of this AD), do not install an air brake control system torsion tube on an affected sailplane unless it has been inspected following the procedures specified in paragraph (f)(1) of this AD, is found to be corrosion free, and an anticorrosive agent has been applied to the inside of the tube as specified in Diamond Aircraft Industries GmbH Work Instruction WI-MSB 36-105, dated April 21, 2011, as specified in Diamond Aircraft Industries GmbH Service Bulletin No. MSB 36-105/1, dated May 2, 2011. Note 1: Credit will be given for the initial test and inspection required in paragraph (f)(1) of this AD and the corrective actions required in paragraphs (f)(2) and (f)(3) of this AD if already done before November 23, 2011 (the effective date of this AD) following Diamond Aircraft Industries GmbH Service Bulletin No. MSB 36-105, original issue.
Required actions
Note 2: This AD differs from the MCAI and/or service information as follows: No differences.
Unsafe condition
The mandatory continuing airworthiness information (MCAI) states: A report has been received of a failed air brake control system torsion tube on a Diamond (formerly Hoffman) H 36 powered sailplane. The results of the subsequent investigation show that the failure was due to corrosion damage. This condition, if not detected and corrected, may lead to failure of the air brake control system in flight, resulting in reduced control of the aeroplane. To address this unsafe condition, Diamond published Mandatory Service Bulletin (MSB) 36-105, containing instructions to test and inspect the air brake control system torsion tube for corrosion damage and, depending on findings, the application of anticorrosive agent to the inside of the torsion tube, or replacement of the torsion tube with a serviceable part. For the reasons described above, this new AD requires repetitive tests and inspections of the air brake control system torsion tube and applicable corrective actions, depending on findings.
Affected ADs
None.
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