Quick view Add to Cart Internal Leakage Check for Reversing Hydromatic Propellers, Ref 661 Document Part Number: No. 156 Number of pages: 2Part Number: No. 156Revision Date: 20-Sept-1948Description: Ref 662 - Adjustment of De-Icer Slip Rings, Ref 663 - Threaded Adapters for Distributor Valves, Ref 664 - Modification of... MSRP: Was: Now: $15.00