Driftdown regulations in the U.S.A.

[Northbeach]

What and where is the FAA “rule” that stipulates how high over an obstacle and within how many miles of my flight path I must be able to fly over following the failure of one engine on a two engine transport category jet?

For example: to fly direct from point A to point B there is a mountain peak of 16,000 MSL between the two points. By regulation do I need to clear this obstacle by 1,000’ or 2,000’ if it is within 5, 3 or 10 miles of my ground track?

Given the failure of one of my two engines if I have a final driftdown altitude of 17,000 MSL does this satisfy the “regulation”? Or if I avoid the obstacle by 5NM have I satisfied the “regulation”? Is this information in Part 121, TERPS or someplace else? I am looking for a specific FAR reference.

Thanks,

[ab33t]

In an emergency none of the above apply as long as you dont intentionaly cause injury

[411A]

In an emergency none of the above apply as long as you dont intentionaly cause injury
Sorry, does not apply.
Generally, airlines are required by the regulatory authority to provide proper drift-down performance data for the route to be flown.
Absent this data...the specific route is closed to ops for the area.
Fact.

[galaxy flyer]

FAR 121.191. Easy search, but ground training is lax in most regulations.

GF

[Northbeach]

And as Galaxy Flyer said the answer is found in FAR 121.191.

In short: 1,000' above all terrain & obstructions within 5 statue miles.

Regarding the 16,000' obstacle stated above, if the 16,000' obstacle is within 5 statue miles of the flight path you would have to clear it by 1,000'. Minimum driftdown altitude would have to be 1,000' above the obstacle or 17,000’.