Airplanes, Paragraph 25.853, Compartment Interiors, Sub-Paragraph (a) Vertical Flammability. ITTS's Certificate of Authority (DER) Designation No. SO.602. Sample Identification: Style: 333101 Town & Country Backing: Wide Cotton Back TEST RESULTS: P.O.# 09536 SCOTT GROUP# 333118 SIZE: 30sqyd!s P