Check the listing for details. AERO COMMANDER MODELS 500S 500U BF GOODRICH PROPELLER DE-ICING SYSTEM DATA SHEET. Condition: Used. Listed at 14.95 USD. THIS IS AN ORIGINAL B.F. GOODRICH ELECTROTHERMAL PROPELLER DE-ICING SYSTEMS DATA SHEET AND PARTS LIST FOR AERO COMMANDER MODELS 500S & 500U. THE DATA SHEET HAS 3 PAGES OF INSTRUCTIONS AND DRAWINGS. THE PARTS LIST IS 2 PAGES FOR KIT NO. 77-185-2, 77-185-3, 77-185-4 AND 77-185-5 SHOWING PART NUMBERS, DESCRIPTION AND QUANTITY OF PARTS. It is original and not a copy and looks great for a publication that is around 50 years old. It is in excellent and completely readable condition with no doodles, tears or other uglies that I could find. A really cool piece of aviation history especially if you had or have this model of aircraft. Flat rate shipping $2.95 in the lower 48 United States. Hawaii, Alaska and all other destinations to pay actual shipping cost. Any questions, please let me know. Payment due within 2 days of purchase. I will do my best to get this out within 24 hours but reserve the right to take up to 3 days. If you have any special needs, please let me know. I pride myself on accurate descriptions and honest disclosures however I am not perfect. If there is ANY problem with your item, please let me know and I will do anything reasonable to make good for it.