Airworthiness Directive · Amendment 39-14659 · Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) 250-B and 250-C Series Turboprop and Turboshaft Engines
Rolls-Royce Corporation (Formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) 250-B and 250-C Series Turboprop and Turboshaft Engines
This AD applies to Rolls-Royce Corporation (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) 250-B17, -B17B, -B17C, -B17D, -B17E, -B17F, -B17F/1, -B17F/2, 250-C18, -C20, -C20B, -C20F, -C20J, -C20R, -C20R/1, -C20R/2, -C20R/4, -C20S, and “C20W series turboprop and turboshaft engines with the gas producer rotor assembly tie bolt part numbers (P/Ns) listed in the following Table 1, installed:
| Manufacturer | Affected part numbers |
|---|---|
| EXTEX Ltd. (EXTEX) | A23008020 and E23008020 |
| Rolls-Royce Corporation (RRC) | 23008020, 6843388 and 6876991 |
| Superior Air Parts Inc. (SAP) | A23008020 |
| Pacific Sky Supply Inc | 23008020P |
These engines are installed on, but not limited to, aircraft in the following Table 2:
| Helicopter | Models |
|---|---|
| Agusta | A109, A109A, A109A II, A109C. |
| Arrow Falcon Exporters | OH-58A+ and OH-58C. |
| Bell Textron | 206A, 206B, 206L. |
| Enstrom | TH-28, 480, 480B. |
| Eurocopter France | AS355E, AS355F, AS355F1, AS355F2. |
| Eurocopter Deutschland | BO-105A, BO-105C, BO-105S. |
| FH-1100 Manufacturing Corp. | FH-1100. |
| Garlick | OH-58A + OH-58C. |
| McDonnell Douglas Company | 369D, 369E, 369F, 369H, 369HM, 369HS, 369HE, 500N. |
| San Joaquin | OH-58A+ and OH-58C. |
| Schweizer | 269D. |
| Aircraft | Models |
| B-N Group Ltd. | BN-2T and BN-2T-4R. |
| SIAI Marchetti s.r.l. | SF600, SF600A. |
The FAA is adopting a new airworthiness directive (AD) for Rolls-Royce Corporation 250-B and 250-C series turboprop and turboshaft engines with certain part numbers (P/Ns) of gas producer rotor assembly tie bolts manufactured by EXTEX Ltd., Pacific Sky Supply Inc., Rolls- Royce Corporation (RRC), and Superior Air Parts Inc. This AD requires operators to remove from service affected gas producer rotor assembly tie bolts, and install serviceable tie bolts. This AD results from eleven reports of RRC tie bolt failure due to high cycle fatigue. We are issuing this AD to prevent tie bolt failure that could cause loss of engine power, resulting in a first stage turbine wheel overspeed and an uncontained engine failure.
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done.
Remove the P/N gas producer rotor assembly tie bolts listed in Table 1 of this AD from service the next time they are disassembled for any reason, or by October 31, 2011, whichever occurs first, and replace with tie bolts with P/Ns that are not listed in Table 1 of this AD.
(g) After the effective date of this AD, do not install any gas producer rotor assembly tie bolt P/Ns listed in Table 1 of this AD in any RRC 250-B and 250-C Series turboprop and turboshaft engines.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Engines
