Airworthiness Directive · Amendment 39-16384 · Rolls-Royce plc (RR) RB211-Trent 900 Series Turbofan Engines
Rolls-Royce plc (RR) RB211-Trent 900 Series Turbofan Engines
Superseded. A later AD replaced this one: AD 2012-12-03. Comply with the one in force.
This AD applies to RR model RB211-Trent 970-84, 970B-84, 972-84, 972B-84, 977-84, 977B-84, and 980-84 turbofan engines. These engines are installed on, but not limited to, Airbus A380 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, do the following actions.
(1) Inspect the IP shaft coupling splines using section 3.A of RR RB211 Trent 900 Series Propulsion Systems Alert Non-Modification Service Bulletin (NMSB) RB.211-72-AG329, Revision 1, dated January 13, 2010, before accumulating 400 cycles-since-new or within 150 cycles-in-service (CIS) after the effective date of this AD, whichever occurs later.
(2) If the coupling, P/N FW33264, was replaced with a new coupling, P/N FW33264, during any shop visit, then you may use the life since that shop visit in place of engine time since new to establish the inspection threshold.
(3) Use the inspection results and actions compliance times or specified in Table 1 of this AD to disposition the engine or to determine the interval for the repetitive inspections.
| Condition measured spline crest in accordance with section 3.A of Rolls-Royce alert NMSB RB.211-72-AG329, Revision 1, dated January 13, 2010, is: | Action | Compliance time/repetitive interval (not to exceed) flight cycles since last inspection |
|---|---|---|
| (i) Less than 0.5 mm with no material remaining | Remove the engine | Before next flight. |
| (ii) Less than 0.5 mm with some material remaining | Remove the engine | Within 10 flight cycles. |
| (iii) Equal to or more than 0.5 mm but less than 1 mm | Repeat inspection | Within 50 flight cycles. |
| (iv) Equal to or more than 1 mm but less than 1.5 mm | Repeat inspection | Within 100 flight cycles. |
| (v) Equal to or more than 1.5 mm but less than 2 mm | Repeat inspection | Within 200 flight cycles. |
| (vi) Equal to or more than 2 mm but less than 2.4 mm | Repeat inspection | Within 300 flight cycles. |
| (vii) Equal to or more than 2.4 mm | Repeat inspection | Within 400 flight cycles. |
Note 1: The nominal unworn dimension of the spline crest is 2.65 mm.
(4) At the next shop visit after the effective date of this AD perform the following:
(i) Replace any IP shaft coupling that was previously borescope inspected in accordance with paragraph (e)(1) of this AD and put on a reduced re-inspection interval in accordance with paragraphs (e)(3)(i) through (e)(3)(vii) of this AD.
(ii) Inspect all other IP shaft coupling splines using paragraphs 3.B.(2) or 3.B.(3) of RR RB211 Trent 900 Series Propulsion Systems Alert NMSB RB.211-72-AG329, Revision 1, dated January 13, 2010.
(5) For the purposes of this AD, a shop visit is the induction of an engine into the shop for maintenance involving the separation of pairs of major mating engine flanges, except that the separation of engine flanges solely for the purposes of transportation without subsequent engine maintenance does not constitute an engine shop visit.
None.
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
