FAA orders · airworthiness directive · current

2005-20-11: Airfoils at the hub and shroud of third-stage turbine wheels

FAA order 2005-20-11 is an airworthiness directive in force since October 18, 2005. The FAA's subject line: Airfoils at the hub and shroud of third-stage turbine wheels. It names the Rolls-Royce 250-C28, Rolls-Royce 250-C28B, Rolls-Royce 250-C47 series engines: about 19 aircraft on the U.S. register today across them, though an order usually covers particular versions or serial numbers rather than every one. System: engine.

What it applies to as the FAA lists it

Kind of product: Engine
Makes: Rolls-Royce Corporation
Models: 250-C28, 250-C28B, 250-C28C
Engine series: Rolls-Royce 250-C28 1 aircraft
Rolls-Royce 250-C28B 3 aircraft
Rolls-Royce 250-C47 series 15 aircraft

Dates and paperwork

In force since: October 18, 2005
Published: October 3, 2005 (signed September 26, 2005)
Docket: FAA-2005-22534
Status: Current
The FAA's document: Read the order on the FAA's site

The FAA's summary their words, unchanged

The FAA is adopting a new airworthiness directive (AD) for Rolls-Royce Corporation (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) (RRC) Models 250-C28, - C28B, and -C28C turboshaft engines. This AD requires a onetime visual inspection of the seal joint in each passage between airfoils at the hub and shroud of third-stage turbine wheels, part number (P/N) 6899383. This AD results from reports of three failed third-stage turbine wheels and from the manufacturer's analysis of those failures. We are issuing this AD to prevent loss of power and uncommanded engine shutdown due to failure of the third-stage turbine wheel.

The order itself the regulatory text, as published

Show the full text (2,428 characters)

2005-20-11 Rolls-Royce Corporation (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison): Amendment 39-14305. Docket No. FAA-2005-22534; Directorate Identifier 2005-NE- 27-AD. \n\nEffective Date \n\n\t(a) This airworthiness directive (AD) becomes effective October 18, 2005. \n\nAffected ADs \n\n\t(b) None. \n\nApplicability \n\n\t(c) This AD applies to Rolls-Royce Corporation (RRC) (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) models 250-C28, -C28B, and -C28C turboshaft engines. These engines are installed on, but not limited to, Bell Helicopter Textron 206L-1; Eurocopter Deutschland BO 105 LS A-1; and Eurocopter Canada BO 105 LS A-3 helicopters. \n\nUnsafe Condition \n\n\t(d) This AD results from reports of three failed third-stage turbine wheels and from the manufacturer's analysis of those failures. We are issuing this AD to prevent loss of power and uncommanded engine shutdown due to failure of thethird-stage turbine wheel. \n\nCompliance \n\n\t(e) You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done. \n\nOnetime Visual Inspection \n\n\t(f) For third-stage turbine wheels, part number (P/N) 6899383, with fewer than 3,000 hours time-since-new (TSN), inspect the next time the third-stage turbine wheel is directly available for removal, at the next turbine overhaul, or by April 30, 2007, whichever occurs sooner. \n\n\t(g) For third-stage turbine wheels, P/N 6899383, with 3,000 hours or more TSN, inspect within 300 hours or by April 30, 2007, whichever occurs sooner. \n\n\t(h) Remove the third-stage turbine wheel and perform a onetime visual inspection of the seal joint in each passage between airfoils at the hub and shroud. Seal joint evidence must not be present within blade fillet radii. See Figure 1 of this AD for reference. \n\n\n\n\n\t(i) Remove from service any turbine wheel that hasseal joint evidence present within blade fillet radii. \n\nAlternative Methods of Compliance \n\n\t(j) The Manager, Chicago Aircraft Certification Office, has the authority to approve alternative methods of compliance for this AD if requested using the procedures found in 14 CFR 39.19. \n\nRelated Information \n\n\t(k) RRC Alert Service Bulletin No. CEB-A-72-2205, dated April 26, 2005, pertains to the subject of this AD.

Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of October 5, 2026. Connections as data: /graph/directive/2005-20-11.json · aircraft systems.