Quick view Add to Cart Supplement, Vultee - Substitution of Rivets on the Rudder Control Bell - Crank Assembly - BT-13, BT-13A, BT-15, and SNV-1 Document Part Number: T.O. No. 01-50B-52A Number of pages: 2Part Number: T.O. No. 01-50B-52ARevision Date: 24-Apr-1944 MSRP: Was: Now: $15.00