Quick view Add to Cart Overhaul Instructions for Aircraft Heaters - Model 920, 921 and 930, and G-475015-A Combustion Air Valve Document Part Number: T.O. No. 15H1-2-9-3, formerly AN 03-70A-13 Number of pages: 6Part Number: T.O. No. 15H1-2-9-3, formerly AN 03-70A-13Revision Date: 1-April-1954Description: Mfg By: South Wind DiV, Stewart Warner MSRP: Was: Now: $15.00