The 538591-60 is an FAA-PMA approved Seal, Plain, Encased manufactured by SKF Aerospace Sealing Solutions as a replacement for Leonardo P/N 109-0104-14-101.
FAA PMA: PQ2457CE, Supplement No. 15 (27 Mar 2019) – Identicality per 14 CFR 21.303 under licensing agreement with Leonardo S.p.A.
Eligibility: Leonardo A109, A109AII, A109C, A109K2.
Note: PMA PQ2457CE is now held by KRS Aerospace Elastomeric Solutions, the former SKF Aerospace Sealing Solutions plant in Elgin, Illinois, sold by SKF to Carco PRP Group in January 2026.
About KRS Aerospace Elastomeric Solutions
KRS Aerospace Elastomeric Solutions (Elgin, Illinois) traces its heritage to Chicago Rawhide, an American company founded in Chicago in 1878 that grew into one of the best-known names in seals and, later, aerospace elastomeric and vibration-control products from its base in Elgin.
SKF acquired Chicago Rawhide in 1990, and the Elgin site became SKF's aerospace elastomeric and sealing operation – the holder of FAA PMA PQ2457CE, first as SKF Aerospace Sealing Solutions. In January 2026 SKF completed the sale of this operation to Carco PRP Group, and it now operates as KRS, manufacturing elastomeric bearings, vibration isolators and engine mounts, dampers and molded rubber products for rotorcraft and other aerospace and defense platforms. The PMA approvals, part numbers and plant stayed the same.
