Trent engines designation

[martinhoo]

Hi all,

Does anyone know what means the last two digits of RR Trent engines designation ?
(Trent500-61, 700-60, 800-17, 900-84)

Does it refer to engine technical characteristics or to the aircraft fitted with the engine ?:confused:


Thank you,

[leewan]

Where did you get this numbers ?
The last two digits of the trent series (e.g: Trent 884, Trent 553, Trent 976) refers to the rated thrust of the engine.
The numbers you wrote for the Trent 800 seem to be way off.

[JBCook]

The dash number is a reference to which aircraft that particular engine model is configured for.

[martinhoo]

I saw this designation in Trent engines Certificate Datasheets on FAA website.
In Certificate Datasheets, Trent engines designation are followed by 2 digits.

For example (the list below is extracted from FAA Regulatory and Guidance Library) :
RB211-Trent-884B-17
RB211-Trent-892B-17
RB211-Trent-895-17
[...]
RB211-TRENT 970-84
RB211-TRENT 972-84
RB211-TRENT 980-84
[...]
RB211 Trent 553-61
RB211 Trent 556-61
RB211 Trent 560-61
[...]
RB211 Trent 772-60
RB211 Trent 772B-60
[...]


Regards

[Horwood]

The final Dash number is the build specification of the engine.There are many variations of seemingly visually identical components which may not be compatible with each other due to modification state. The Air Transat A330 Atlantic glider incident was a case of getting the combination wrong. The Rolls Royce Illustrated Part Catalogue is a nightmare to navigate around with many restrctions on interchangability and intermixability of components. The build dash number makes selection of the correct components easier.Airlines usually try to keep all their engines to the same build spec to simplify spares holding. I hope this explanation is not oversimplistic.

[martinhoo]

Ok ! Thanks for theses explanations

[JBCook]

Sorry, but the Dash number is simply, and only, to denote which application (A/C) the engine is configured for.

Numbers/letters behind the mark number but in front of the dash are for specific configuration/performance differentiation within a type, and should be certified independently (or at least, appear separately on the Type Certificate). Within these variants there are likely to be (over time) many valid build standards.

A slash number (/xx) behind the Dash number denotes a specific build standard for a customer.

(Caveat: The Trent 1000 is a bit of an oddity in this respect)

I understand the Air Transat glider incident was related to partial Service Bulletin incorporation, and not to rating, Dash or Slash number confusion.