Topic Author
Posts: 406
Joined: Wed Aug 01, 2001 11:44 pm

ER Vs Etops

Thu Sep 27, 2001 10:41 am

I understand that some twins are certified ETOPS due to modfications to the aircraft but what is the difference between a aircraft such as a 767ER or 757ER and one that is ETOPS certified? Do they have the same capabilities such as range,avonics,MTOW? If so, why not classify all big twins as ETOPS? Do they come from the assembly line rated ETOPS or are the modifications made after delivery? It is to my understanding that the 767-400 is the only aircraft classified 'out the box' by the FAA as ER and that the airlines are the ones who classify their aircraft as ER's. I hope that I'm making sense. Please explain. Thanks. ?:-l
Educate your children before others mis-educate them!!!
Posts: 384
Joined: Wed Apr 05, 2000 11:07 am

RE: ER Vs Etops

Thu Sep 27, 2001 1:11 pm

The designation ER simply means Extended Range. It's a Code used by Boeing and other manufacturers, it is not issued by the FAA. ETOPS, however, is a standard set by the FAA.

There are not many differences between a Etops and a non-Etops twin. However, there are minor equ. requirements such as more life jackets, etc.

Etops is actually more of an Airline rating, not so much the plane's. Even the Airbus 32X family are certified for 120min ETOPS. Etops requires the airline to have stricter(sp?) rules on the aircraft's maintance, one good example is that a mech. will only replace an oil filter on one engine, while another mech. will replace the other's. This elimates the chance the the mech can do the wrong thing twice, therefore leaving a twin engine-less.

Boeing 777's are 180min out-of-the-box, and there are rumors that the recently launched LRs will be 207min -out-of-the-box, which currently, is only granted on a case-by-case basis, and only with the right airline/plane/engine combo.

Hope I got it right,


Topic Author
Posts: 406
Joined: Wed Aug 01, 2001 11:44 pm

RE: ER Vs Etops

Fri Sep 28, 2001 6:14 am

Thanks for the info.I guess it's more of a matter of expenses as to why airlines don't adhere to the stricter rules for ETOPS.
Educate your children before others mis-educate them!!!
Posts: 124
Joined: Wed Feb 21, 2001 10:30 am

RE: ER Vs Etops

Fri Sep 28, 2001 8:17 am

There are other more important differences than just life jackets. Some differences between a 767ER a
non-ER 767 would be:

FAA required:
Hydraulic Motor Generator (HMG)
195 Minute cargo fire suppression (vs 60 Min.)
APU start capability up to FL350

Boeing added:
Higher Gross Weight
More fuel capacity
Fuel Jettison system
A CDU with Stand-by navigation capabilities
Up-rated engines
Different backup power wiring for the IRU's and EFIS

Usually to fly ETOPS you need an ER, or at least the FAA required mods.

To summerize: Boeing builds ER's while airlines fly with an FAA approved ETOPS program.

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