| 2006-16-04 | Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division… | Sep 7, 2006 | Engine (250-C20 SER) |
| 2006-13-06 | Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division… | Jul 26, 2006 | Engine (250-C20 SER)Only with: Engines with gas producer rotor assembly tie bolt P/Ns A23008020, E23008020 (EXTEX), 23008020, 6843388, 6876991 (RRC), A23008020 (SAP), or 23008020P (Pacific Sky Supply) installed. |
| 2005-10-13 | Rolls-Royce Corporation (Formerly Allison Engine Company) 250-B17B, -B17C, -B17D, -B17E… | Jun 22, 2005 | Engine (250-C20 SER)Only with: Engines that do not have turbine energy absorbing ring RRC P/N 23035175, or an equivalent FAA-approved serviceable ring, installed. |
| 97-20-15 | Hiller Aircraft Corporation Model UH- 12A, UH-12B, UH-12C, UH-12D, and UH-12E Helicopters | Nov 12, 1997 | Airframe (UH-12E) |
| 97-10-16 | Hiller Aircraft Corporation Model UH- 12, UH-12A, UH-12B, UH-12C, UH-12D, UH-12E… | Jun 27, 1997 | Airframe (UH-12E)Only with: Having control rotor blade spar tube P/N 36003, 36006, 36129, 36129-25, 36203, 36203-15, 36203-21, or 36209-3, or cuff P/N 36101-1, 36101-4, 36108, 36115-1, 36115-4, 36115-6, 36115-8, or 36124 installed; includes UH-12D and UH-12E converted to turbine power per STC SH177WE and SH178WE. |