Airworthiness Directive · Amendment 39-16457 · Rolls-Royce Deutschland Ltd & Co KG (RRD) Models Tay 620-15, Tay 650-15, and Tay 651-54 Turbofan Engines
Rolls-Royce Deutschland Ltd & Co KG (RRD) Models Tay 620-15, Tay 650-15, and Tay 651-54 Turbofan Engines
This AD applies to Rolls-Royce Deutschland Ltd & Co KG (RRD) models Tay 620-15, Tay 650-15, and Tay 651-54 turbofan engines. These engines are installed on, but not limited to, Fokker F28 Mark 0070 and Mark 0100 airplanes and Boeing 727 series airplanes.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
Unless already done, within 30 days after the effective date of this AD, amend the approved Airworthiness Limitation Section to incorporate the new, reduced life limits as follows:
(1) The maximum approved lives (MAL) of the High Pressure Compressor (HPC) rotor discs are reduced to the MALs specified in the following Table 1 of this AD:
| For | Part No. | The MAL is |
|---|---|---|
| (i) HPC Stage 1 Disc | JR18049 | 18,800 cycles. |
| (ii) HPC Stage 3 Disc | JR18743 | 18,100 cycles. |
| (iii) HPC Stage 6 Disc | JR18748 | 19,300 cycles. |
| (iv) HPC Stage 7 Disc | JR17365 | 17,300 cycles. |
| (v) HPC Stage 12 Disc | JR31928 | 18,900 cycles. |
(2) The MAL of certain HPC rotor discs are reduced. The affected disc serial numbers and the reduced MAL are defined in Rolls-Royce Deutschland Ltd & Co KG Alert Non-Modification Service Bulletin TAY-72-A1740, dated February 11, 2009.
(3) Thereafter, except as provided in paragraph (f) of this AD, no alternative replacement times may be approved for these parts.
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
