Quick view Add to Cart Overhaul Instructions with Parts Breakdown for Secondary Heat Exchanger - Part 171850 - Model HE3-25-1 Document Part Number: NAVAER 03-80HAR-5 Number of pages: 4Part Number: NAVAER 03-80HAR-5Revision Date: 15-Oct-1959Description: Mfg By: Airesearch MSRP: Was: Now: $15.00