MD11Fanatic From United States of America, joined Oct 2006, 81 posts, RR: 0 Posted (6 years 8 months 2 days 8 hours ago) and read 3208 times:
Do the large Trijets such as the DC-10 or MD-11 have any sort of restrictions or guidelines for operations, such as ETOPS is to the twin-engine aircraft, or are the DC-10s and the like exempt from any such operating procedures?
Also, do the four-engine jets have to follow ETOPS or any variation of such for operation?
FXRA From United States of America, joined Jul 1999, 693 posts, RR: 2 Reply 5, posted (6 years 8 months 8 hours ago) and read 2908 times:
the latest I read from the FAA now defines ETOPS as Extend Operations, removing the Twin. Basically from the few pages I read of it, for 3 and 4 engine aircraft, nothing much changes until you reach 180 minutes from suitable airport or for Over the Poles operations. And then the gist is the designation of ETOPS Alternate airports and having a plan for passenger handling should you divert.
The same ruling essentially allows twins to operate as far as the airline wants from an airport. The theory being engine and systems reliability have increased so much that diversions for other reasons (medical for example) almost equal mechanical diversions, and having for engines won't help a passenger having cardiac arrest. These new rules do not apply to 3 and 4 engines all cargo aircraft.
3201 From , joined Dec 1969, posts, RR: Reply 7, posted (6 years 7 months 4 weeks 22 hours ago) and read 2766 times:
Quoting FXRA (Reply 5): the latest I read from the FAA now defines ETOPS as Extend Operations, removing the Twin
This is correct, as of Februrary when the new rule went into effect, although some aspects have delayed implementation.
Quoting Blackbird (Reply 6): So they want to take away all restrinctions from twinjets, and add restrictions to three and four engines?
No. They tweaked and clarified and rationalized some of the twin rules, made some less conservative, introduced some new ones, and put them into the FAR's instead of just an AC. They added some new rules for 3- and 4-engined aircraft, but most are not restrictive (much or at all) as long as you don't attach an overly conservative interpretation to them.
While there was no tidy rule like ETOPS before, most or all operators already did analysis for decompression, for losing one engine, and for losing two engines, making sure they had enough fuel to divert safely, even if they had to dump fuel to level off.
3201 From , joined Dec 1969, posts, RR: Reply 8, posted (6 years 7 months 4 weeks 21 hours ago) and read 2761 times:
Quoting FXRA (Reply 5): The same ruling essentially allows twins to operate as far as the airline wants from an airport.
This is only partly true. The point is that now the distance the aircraft can be operated depends on the aircraft, the operating practices, and the support the operator has arranged, not on arbitrary limits. The limits have been clarified, and some new ones have been introduced. I would say the new rule makes a lot more sense than the old one.