Document ID: chunk:federal_register_of_legislation:F2006L02499:body:0:p1
Version: federal_register_of_legislation:F2006L02499
Segment Type: other
Provision Reference: 
Character Range: 0–3738

AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 1998.  The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Allison Turbine Engines - 250 Series
AD/AL 250/89  Gas Producer Rotor Tie Bolt  9/2006

Applicability:  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 Table 1 of this Airworthiness Directive installed.

                Table 1. - Affected Gas Producer Rotor Assembly Tie Bolts
                Manufacturer                     Affected part numbers (P/N)
                  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

                Note 1:  These engines are installed on, but not limited to, aircraft listed in Table 2 of this AD:

                Table 2. - Applicable Aircraft
                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.

              Table 2. - Applicable Aircraft (continued)
                 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.
                 B-N Group Ltd.                 BN-2T and BN-2T-4R.
                 SIAI Marchetti s.r.l.          SF600, SF600A.

Requirement:     1. Remove from service the P/N gas producer rotor assembly tie bolts listed in Table 1 of this Airworthiness Directive, and replace with tie bolts with P/Ns that are not listed in Table 1 of this Airworthiness Directive.

                 2. 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.

                 Related Information

                 RRC Commercial Engine Bulletin (CEB) CEB A-304, CEB A-1371, CEB A-72-4076, TP CEB A-176, TP CEB A-1319, TP CEB A-72-2027, Revision N/C, dated 23 May 2005, and EXTEX Service Bulletin T-090, Revision N/C, 23 dated May 2005, pertain to the subject of this Airworthiness Directive.

              Note 2:  FAA AD 2006-13-06 Amdt 39-14659 dated 14 June 2006 refers.
Compliance:      1. At the next time they