Southeast Aero-Tek

Document ID: FAA-2007-0089-0007
Document Type: Public Submission
Agency: Federal Aviation Administration
Received Date: December 10 2007, at 02:09 PM Eastern Standard Time
Date Posted: December 10 2007, at 12:00 AM Eastern Standard Time
Comment Start Date: October 25 2007, at 12:00 AM Eastern Standard Time
Comment Due Date: December 10 2007, at 11:59 PM Eastern Standard Time
Tracking Number: 80375f18
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This is comment on Rule

Airworthiness Directives; Various Transport Category Airplanes Equipped With Auxiliary Fuel Tanks Installed in Accordance With Certain Supplemental Type Certificates

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Comments on "Appendix A--Deactivation Criteria 1. NOTE suggests the bladders could be removed. The construction of the "box and bladder" requires the boxes be removed to access the bladders. If the bladders were removed several major structural repairs and plumbing modifications would be required. 2. Section (4) AC 25-8 is "Auxiliary Fuel Tank Installations" not "Fuel Tank Flammability Minimization" AC25.981-2 is "Fuel Tank Flammability Minimization" and I see no direct approved methods in Section (4) unless they are in the FAR's (25.981) mentioned in the AC. 3.The "cylindrical tank system" could retain its bleed air system to purge the tanks with bleed air if the vent valve were opened.