16June01OCS From , joined Dec 1969, posts, RR: Posted (12 years 2 months 1 week 4 days 10 hours ago) and read 1312 times:
Here's a link to an article I read today in the Seattle Post Intelligencer regarding a UAL 767 that shut down both engines 70 miles after leaving Maui for LA. The crew were able to restart both engines and return for an emergency landing on the Big Island.
N766AS From , joined Dec 1969, posts, RR: Reply 1, posted (12 years 2 months 1 week 4 days 8 hours ago) and read 1215 times:
Interesting... I haven't had the chance to read the P-I today, so thanks for posting.
One thing about the story though- definately not James Wallace's best work. I wonder how the editors could let this one go to print as sloppy as it was.
16June01OCS From , joined Dec 1969, posts, RR: Reply 3, posted (12 years 2 months 1 week 4 days 7 hours ago) and read 1188 times:
Here's a quote from the article that I don't quite get:
"Nance, the aviation expert, said a 767 can glide in unpowered flight a distance that is equal to about 3.5 times its altitude. That means United Flight 42 could have glided more than 100 miles had the pilots not been able to restart the engines."
Be interesting to see how this one turns out... At least they didn't keep going after the re-start, like that DL did LAX-CVG some years ago. Must have been a little surreal to see folks getting of in CVG wearing life vests...
N766AS From , joined Dec 1969, posts, RR: Reply 5, posted (12 years 2 months 1 week 4 days 5 hours ago) and read 1168 times:
>Where'd they get the 100 mile distance from?
I guess it may have been confusing, but you found the answer yourself when you were doing the math.
>29,000 x 3.5 = 101,500 feet
I think they meant the altitude times 3.5 gives you the miles it can glide. In this case, about 102 miles.
OPNLguy
James Wallace's work is usually a lot better than that... I wonder what was wrong with the guy last night. I still can't believe that story made it past the editors...haha. It reads like a sixth grader wrote it.
I think they may have pulled the FDR to see what the pilot did during the departure that may not necessarily have been present on the CVR... like if he flipped the fuel cut switch on accident- that would show on the FDR.
Kohflot From , joined Dec 1969, posts, RR: Reply 7, posted (12 years 2 months 5 days 21 hours ago) and read 1082 times:
Not sure if y'all have seen this...
WASHINGTON, March 14 (Reuters) - Safety investigators probing the loss of power in both engines of a United Airlines' (NYSE:UAL - news) Boeing Co. (NYSE:BA - news) 767 near Hawaii this month said Wednesday had found no indication the aircraft malfunctioned.
The National Transportation Safety Board said the incident occurred March 4 while the pilots attempted to balance the fuel load between the plane's various tanks after departing from Maui bound for Los Angeles.
Inspection of the plane's flight data recorder showed that, while climbing through 29,000 feet (8,800 metres) the right engine experienced a reduction in power to below the normal idle speed, but did not completely stop operating.
About 20 seconds later, the left engine experienced a similar cut in power, the safety board said in a statement. Power was restored and the aircraft diverted to Kona, Hawaii.
The focus of the inquiry was now shifting to evaluation of operational procedures and operating characteristics of the engines and the fuel system, the safety board said.
Buff From Australia, joined Mar 2007, 0 posts, RR: 2 Reply 8, posted (12 years 2 months 5 days 20 hours ago) and read 1079 times:
Its a darn good thing that pilot's 767 had an Operating APU, thereby starting the engines or some of those people would probably be dead.
An APU or alternate air source is not always necessary to restart engines while airborne. So long as sufficient altitude exists in order to maintain about 300 kts, a windmill start may be possible.
During multiple engine out ops at high altitude, glide speeds are recommended to be highest forward speed up to 300 kts.
Remember, all that is required is sufficient rotation of the HP compressor to initiate a start.
F-WWAI From Andorra, joined Dec 1999, 131 posts, RR: 0 Reply 9, posted (12 years 2 months 5 days 20 hours ago) and read 1068 times:
looks a bit like fuel starvation because aircraft boost pumps were selected off in climb, kind of fuel system mismanage if it happenend in an attempt to do fuel balancing.
fuel contains air in solution. when climbing with boost pumps inoperative, the fuel in the engine suction line gazes out and becomes a mixture of liquid and vapor. the engine pumps can digest this mixture to some extend, but as altitude increases, thus ufel supply pressure decreases, the pumps end up cavitating and the fuel supply for combustion is geopardized. this can lead to engine thrust loss or shut down.
the NTSB will certainly clarify what happened in this case.
FW
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