The Federal Aviation Administration's formal directive by week's end will require changes in the way ground crews prepare planes and pilots fly them in extreme cold weather, FAA spokeswoman Alison Duquette said Thursday.
Currently 777 pilots are required to rev their engines when the fuel temperature falls to 14 degrees Fahrenheit. That would conceivably dislodge any ice that might be in the fuel line.
The FAA directive will apply to more than 50 U.S.-registered Boeing 777s with Rolls Royce engines, mostly operated by American Airlines and Delta Air Lines Inc.
