Airworthiness directives › 2004-04-05
AD 2004-04-05 Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company) AE 3007 Series Turbofan Engines
Models named: EMB-145, EMB-145ER, EMB-145MR, EMB-145LR, EMB-135ER, EMB-135LR. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD is applicable to Rolls-Royce Corporation (RR) (formerly Allison Engine Company) AE 3007A, AE 3007A1/1, AE 3007A1/2, AE 3007A1, AE 3007A1/3, AE 3007A1P, and AE 3007A3 turbofan engines. These engines are installed on, but not limited to, Embraer Model EMB-145, EMB-145ER, EMB-145MR, EMB-145LR, EMB-135ER, and EMB-135LR airplanes.
Compliance
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done. Inspection for Bearing Material Contamination of the Oil System (f) Inspect for bearing material contamination of the oil system using paragraph 2.A. of the Accomplishment Instructions of RR service bulletin (SB) No. AE 3007A-79-034, dated May 14, 2002, as follows: (1) Initially inspect within 50 flight hours or five flight days after the effective date of this AD. (2) Thereafter, inspect every 50 flight hours or every five flight days. Terminating Actions (g) As terminating actions to the repetitive inspections specified in paragraph (f)(2) of this AD, do any one of the following paragraphs (g)(1) through (g)(7), by December 31, 2007: (1) Modify high pressure (HP)-to-low pressure (LP) seal assembly, part number (P/N) 23068183, and remark to P/N 23073953, at engine overhaul, using RR SB AE 3007A-72-199, Revision 3, dated May 13, 2002. (2) Install new design HP-to-LP seal assembly, P/N 23074729, at engine overhaul, using RR SB AE 3007A-72-213, Revision 1, dated May 13, 2002. (3) Install new design HP-to-LP seal assembly, P/N 23077397, at engine overhaul, using RR SB AE 3007A-72-213, Revision 2, dated November 20, 2003. (4) Install new design HP-to-LP seal assembly, P/N 23074463, at engine overhaul, using RR SB AE 3007A-72-248, dated July 29, 2003. (5) Modify HP-to-LP seal assembly, P/N 23074729, and remark to P/N 23076526, at engine overhaul, using RR SB AE 3007A-72-263, Revision 1, dated March 4, 2003. (6) Modify HP-to-LP seal assembly, P/N 23074729 or P/N 23076526, and remark to P/N 23077397, at engine overhaul, using RR SB AE 3007A-72-284, dated October 16, 2003. (7) Using Embraer SB 145-79-0001, dated April 24, 1998, modify the airplane wiring so that the oil impending bypass message will be displayed in the cockpit when the primary engine magnetic chip detector captures debris. Alternative Methods of
Unsafe condition
This AD is prompted by design changes introduced by the manufacturer that reduce the No. 1 bearing load. The actions specified in this AD are intended to prevent the rapid failure of the No. 1 bearing, which could result in smoke in the cabin and an uncommanded in-flight engine shutdown.
Read the original on the Federal Register →
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1