When AVOX Systems, Inc., manufacturer of the oxygen cylinders used in Sovereigns increased the Hydrostatic Test date of its bottles from 36 to 60 months, the change was incorporated into Chapter 5 of the Model 680 Maintenance Manual. Task 35-00-30-961 for the primary
O2 bottle was moved from Inspection Document 22 to Inspection Document 35.
However, the second oxygen bottle installed in aircraft with the Extended Range Oxygen System was mistakenly overlooked. Task 35-00-20-960 for the extended range O2 bottle remained in Inspection Document 22, which is due for test every 36 months or 3 years.
Both the primary and secondary O2 bottles are the same P/N 804882-12; therefore, the hydrostatic test date of both bottles is due every 60 calendar months from the date of manufacture or previous hydrostatic test date. The MSG-3 review board has recently approved moving Task 35-00-20-960 for the extended range O2 bottle into Inspection Document 35 due every 60 months or 5 years. The revised inspection requirement will be in the next revision of the Model 680 Maintenance Manual.
For the interim, this article can be used as an authorization to extend and perform Task 35-00-20-960 for the extended range O2 bottle when required by Inspection Document 35.
Note: CESCOM can only revise a required document time limit when the published maintenance manual reflects that change. Because of this the primary O2 bottle shows a due date 60 calendar months from the last hydrostatic test date. The extended range O2 bottle still remains at 36 calendar months from the previous hydrostatic test date. To correct the CESCOM Report, operators may submit a Maintenance Transaction Report (MTR) showing the new hydrostatic test date with the extended range O2 bottle at 60 calendar months from the previous date. Please attach a copy of this article with the MTR.
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