Airworthiness Directive · Amendment 39-11758 · Rolls-Royce plc RB211 Series Turbofan Engines
Rolls-Royce plc RB211 Series Turbofan Engines
Rolls-Royce plc (R-R) Model RB211-22B and -524 series turbofan engines, not incorporating new intermediate pressure (IP) compressor stage 6-7 rotor shafts assemblies with redesigned stage 6 disks in accordance with R-R Service Bulletin (SB) No. RB.211-72-9993, dated August 26, 1994. These engines are installed on but not limited to Boeing 747 series and 767 series, and Lockheed L-1011 series aircraft.
Note 1: This airworthiness directive (AD) applies to each engine identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For engines that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (e) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment supersedes an existing airworthiness directive (AD) applicable to certain Rolls-Royce plc (R-R) RB211 series turbofan engines. That AD currently requires the removal from service of intermediate pressure (IP) compressor stage 6-7 rotor shafts that exceed reduced cyclic life limits. This amendment requires further reduction of cyclic life limits and introduction of new reduced cyclic bands for rework. This action is prompted by additional stress analysis conducted following failure of an IP compressor stage 6 disk. The actions specified by this AD are intended to prevent an uncontained engine failure due to rupture of an IP compressor stage 6-7 rotor shaft.
Required as indicated, unless previously accomplished.
To prevent an uncontained engine failure due to rupture of an IP compressor stage 6-7 rotor shaft, accomplish the following:
For IP compressor stage 6-7 rotor shafts that have not been reworked in accordance with SB RB.211-72-9594, Revision 8, dated January 14, 1999, Revision 7, dated September 16, 1994, Revision 6, dated August 12, 1994, or Revision 5, dated February 12, 1993, remove the rotor shafts prior to exceeding the life limits established in Table 1 of this AD under sub-title “Pre SB72-9594” and replace with serviceable parts.
| Life limits after 12/31/01 | Rework bands | Rework bands through 12/31/00 | Rework bands after 12/31/00 | Rework bands after 12/31/01 | Post SB72-9594 | Life limits through 12/31/00 | Life limits after 12/31/00 | Life limits after 12/31/01 | Post SB72-9618 | Life limits through 12/31/00 | Life limits after 12/31/00 | Life limits after 12/31/01 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RB.211-22B-02 Pre SB72-5787 and Pre SB72-8700 | 11000 | 10000 | 9000 | 8000-11000 | 7500-10000 | 7500-9000 | 18000 | 17600 | 16600 | N/A | N/A | N/A |
| RB.211-22B-02 Pre SB72-5787 and Post SB72-8700 | 11000 | 10000 | 10000 | 8000-11000 | 7500-10000 | 7500-10000 | 17310 | 16960 | 15960 | N/A | N/A | N/A |
| RB.211-22B-02 Post SB72-5787 and Pre SB72-8700 | 11000 | 11000 | 11000 | 8000-11000 | 8000-11000 | 8000-11000 | 18000 | 18000 | 18000 | N/A | N/A | N/A |
| RB.211-22B-02 Post SB72-5787 and Post SB72-8700 | 11000 | 11000 | 11000 | 8000-11000 | 8000-11000 | 8000-11000 | 17310 | 17310 | 17310 | N/A | N/A | N/A |
| RB.211-524B-02 RB.211-524B3-02 RB.211-524B4-02 Pre SB72-5787 | 7500 | 7250 | 6250 | 6000-7500 | 4750-7250 | 4750-6250 | 13500 | 13500 | 12750 | 17500 | 17500 | 17500 |
| RB.211-524B-02 RB.211-524B3-02 RB.211-524B4-02 Post SB72-5787 | 8500 | 8200 | 7200 | 6500-8500 | 5700-8200 | 5700-7200 | 15000 | 14700 | 13700 | 19000 | 19000 | 18000 |
| RB.211-524B-B-02 RB.211-524B4-D-02 Pre SB72-5787 | 7500 | 7500 | 7400 | 6000-7500 | 6000-7500 | 5500-7400 | 13500 | 13500 | 13500 | 17500 | 17500 | 17500 |
| RB.211-524B-B-02 RB.211-524B4-D-02 Post SB72-5787 | 8500 | 8200 | 7200 | 6500-8500 | 5700-8200 | 5700-7200 | 15000 | 14700 | 13700 | 19000 | 19000 | 18000 |
| RB211-524B2 RB211-524C2 RB211-524D4 RB211-524D4X Pre SB72-5787 | 7500 | 7500 | 7300 | 6000-7500 | 6000-7500 | 5800-7300 | 13500 | 13500 | 13500 | 17500 | 17500 | 17500 |
| RB.211-524B2 RB.211-524C2 RB.211-524D4 RB.211-524D4X Post SB72-5787 | 8500 | 8250 | 7250 | 6500-8500 | 5800-8250 | 5800-7250 | 15000 | 14500 | 13500 | 19000 | 18750 | 17750 |
| RB.211-524B2-B RB.211-524C2-B Pre SB72-5787 | 7500 | 7500 | 7300 | 6000-7500 | 6000-7500 | 5800-7300 | 13500 | 13500 | 13500 | 17500 | 17500 | 17500 |
| RB.211-524B2-B RB.211-524C2-B Post SB72-5787 | 8500 | 8200 | 7250 | 6500-8500 | 5800-8200 | 5800-7250 | 15000 | 14500 | 13500 | 19000 | 18650 | 17650 |
| RB.211-524D4-B RB.211-524D4X-B Post SB72-5787 | 8500 | 8500 | 7750 | 6500-8500 | 6500-8500 | 5750-7750 | 15000 | 15000 | 15000 | 19000 | 19000 | 19000 |
| RB.211-524G RB.211-524G-T RB.211-524H RB.211-524H-T Post SB72-5787 | 8500 | 8150 | 7150 | 6500-8500 | 5750-8150 | 5750-7150 | 13950 | 13950 | 13950 | N/A | N/A | N/A |
(b) Remove from service IP stage 6-7 rotor shafts that have been reworked in accordance with R-R SB RB.211-72-9594, Revision 8, dated January 14, 1999, Revision 7, dated September 16, 1994, Revision 6, dated August 12, 1994, or Revision 5, dated February 12, 1993, prior to exceeding the new, reduced cyclic life listed in Table 1 of this AD under the sub-title “Post SB72-9594” and replace with serviceable parts.
(c) Remove from service IP compressor stage 6-7 rotor shafts that have been reworked in accordance with R-R SB RB.211-72-9618, dated August 7, 1992, prior to exceeding the new, reduced cyclic life limits listed in Table 1 of this AD under the sub-title “Post SB72-9618” and replace with serviceable parts.
(d) IP compressor stage 6-7 rotor shaft rework in accordance with R-R SB RB.211-72-9594 can only be accomplished when the cyclic life of the part falls within the rework bands established in Table 1 of this AD. To accomplish rework of IP compressor stage 6-7 rotor shafts prior to reaching the lower limit of the rework bands specified in Table 1 of this AD, the part must be artificially aged to the cyclic life which defines the lower limit of the applicable rework bands in Table 1 of this AD.
Note 2: For example, if the lower limit of the rework band is 8,000 cycles, and the part is reworked at 7,000 cycles, the part must be artificially aged by adding 1,000 cycles to the cycles since new recorded on the part; i.e., on return to service the cycles since new on this part would be 8,000 cycles.
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.
