Zebfly2 From United States of America, joined Aug 2001, 417 posts, RR: 1 Posted (13 years 8 months 21 hours ago) and read 3477 times:
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!!!
B767-400er From Hong Kong, joined Apr 2000, 290 posts, RR: 0
Reply 1, posted (13 years 8 months 19 hours ago) and read 3448 times:
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.