Airworthiness Directive · Amendment 39-17672 · Rolls-Royce plc Turbofan Engines
Rolls-Royce plc Turbofan Engines
This AD applies to Rolls-Royce plc (RR) RB211-535E4-37, -535E4-B-37, -535E4-C-37, RB211 Trent 768-60, 772-60, and 772B-60 turbofan engines with turbine disc part numbers (P/Ns) and serial numbers (S/Ns) listed in Table 1 to paragraph (c) of this AD.
| Engine | P/Ns | S/Ns | New reduced cyclic life limit |
|---|---|---|---|
| RB211-535E4-37,-535E4-B-37, -535E4-C-37 | UL39767 | LDRCZ19900 | 11,400 flight cycles (FCs). |
| UL39767 | LDRCZ19903 | ||
| UL39767 | LDRCZ19904 | ||
| RB211 Trent 768-60, 772-60, and 772B-60 | FK26893 | LDRCZ19901 | 8,687 FCs. |
| FK26893 | LDRCZ20081 | ||
| FK26893 | LDRCZ20082 | ||
| FK26893 | LDRCZ20084 | ||
| FK26893 | LDRCZ20088 | ||
| FK26893 | LDRCZ20089 | ||
| FK26893 | LDRCZ20090 | ||
| FK26893 | LDRCZ20093 | ||
| FK26893 | LDRCZ20094 | ||
| FK26893 | LDRCZ20097 | ||
| FK26893 | LDRCZ20099 | ||
| FK26893 | LDRCZ20100 | ||
| FK20795 or FW53118 | LDREB12176 | 9,270 FCs. | |
| FK20795 or FW53118 | LDREB12177 | ||
| FK20795 or FW53118 | LDREB12178 | ||
| FK20795 or FW53118 | LDREB12179 | ||
| FK20795 or FW53118 | LDREB12180 |
We are adopting a new airworthiness directive (AD) for Rolls- Royce plc (RR) RB211-535E4-37, -535E4-B-37, -535E4-C-37, RB211Trent 768-60, 772-60, and 772B-60 turbofan engines. This AD requires removal of certain high-pressure (HP) and intermediate-pressure (IP) turbine discs before their accumulated cyclic lives have reached the revised limits. This AD was prompted by a report of an HP disc contaminated with a steel inclusion. We are issuing this AD to prevent failure of the HP or IP turbine disc, uncontained engine failure, and damage to the airplane.
(1) Remove from service, within 30 days, any HP or IP disc identified in Table 1 to paragraph (c) of this AD that has exceeded the new cyclic life limit, or before the disc accumulates flight cycles that equal the new reduced cyclic life limit listed in Table 1 to paragraph (c) of this AD, whichever is later.
(2) Do not approve for return to service any engine with any installed HP or IP turbine disc listed in Table 1 to paragraph (c) of this AD, if the disc exceeds the new reduced cyclic life limit listed in Table 1 to paragraph (c) of this AD.
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.
