22right From United States of America, joined Apr 2004, 420 posts, RR: 1 Posted (10 years 10 months 3 weeks 6 days 19 hours ago) and read 5259 times:
I was flying from PHX to ORD yesterday on UA. While sitting on the taxiway for takeoff clearance I was watching a stream of departures from Rwy 27R. I was observing an AA MD80 taxiing toward the runway when all of a sudden a gush of flame spurted out from one of its engines. It was only for a brief moment but it startled the heck out of me. I was very tempted to press the FA call button and have this reported to the tower... but decided against it since I have seen such pictures on A.net before. I closely watched that flight take off, and believe me, I was praying until it vanished from sight.
My question is, how common is this phenomenon? What causes it, and is it dangerous? Should I have called a FA and asked her to have our pilot inform the tower or the other a/c? For the record, it was around 4:30 PM yesterday and the temp in PHX was probably around 95 degrees F.
"I never apologize! I am sorry, but that's the way it is!" - Homer Simpson
Greasespot From Canada, joined Apr 2004, 3091 posts, RR: 20
Reply 2, posted (10 years 10 months 3 weeks 6 days 18 hours ago) and read 5181 times:
I do not believe it was a problem. We have 1 727 with a different fuel cut off/ fuel on. IF They move the start lever past the detent to the run position they will get a blast of flame from the engine. Since we only have one A/C like this the pilots sometimes forget and poof....We get flames. This is not a big deal providing it doesn't happen all the time. Perhaps American has an A/C like this.
I am not saying this is what happened just tossing out a possibility.
Sometimes all you can do is look them in the eye and ask " how much did your mom drink when she was pregnant with you?"
Aa777flyer From , joined Dec 1969, posts, RR:
Reply 3, posted (10 years 10 months 3 weeks 6 days 18 hours ago) and read 5133 times:
Sometimes a bit of fuel accumalates in the combustion chamber, when the engine is started it ignites and creates a bit of a flame that is discharged out the back of the engine. This also happens from time to time with APU's.
Zrb2 From United States of America, joined May 2000, 902 posts, RR: 0
Reply 5, posted (10 years 10 months 3 weeks 6 days 17 hours ago) and read 5006 times:
An article I read yesterday was about the different ways airlines are conserving fuel these days. One of the methods is to taxi with only one engine while keeping the other engine off until close to the departure end of the runway. Its possible he was starting up that 2nd engine while deep into his taxi.
StearmanNut From United States of America, joined Apr 2004, 352 posts, RR: 0
Reply 6, posted (10 years 10 months 3 weeks 6 days 16 hours ago) and read 4940 times:
I am thinking what you saw was a rollling crossbleed start of the second engine. Many jets will strat one engine begin a roll to the runway and will be starting additional engines in this manner. Sometimes you will see spectacular displays of flames and smoke when this occurs on a cold start.
If wishes were horses, a Tail Dragger I would fly...
EMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 12, posted (10 years 10 months 3 weeks 6 days 12 hours ago) and read 4644 times:
Actually very common....a said above, at idle some fuel builds in the combustion can, then when power is applied it flashes off giving you a quick 'afterburner' effect. If the aircraft was not yet out on the runway, he may have just started the engine that engine... when the same thing happens. During the take off roll, the crew monitors several things including Fuel Flow and ITT.. any shift in these would indicate a problem.
"It's not the size of the dog in the fight, but the size of the fight in the dog"
Miami1 From Australia, joined Feb 2001, 706 posts, RR: 0
Reply 14, posted (10 years 10 months 3 weeks 6 days 9 hours ago) and read 4539 times:
About you looking like a fool. Pax comments have been known to prevent accidents. And there are many accidents that may have been prevented if pax had of spoken up. (British Midland 737-400 in Kegworth 1989 for one and and Air Ontario F28 in Dryden with snow on the wings. Another was the lady who saw a hole on the fuselage on the Aloha 737 as she was boarding - we all know what happened then.)
My point is you shoud feel confident to bring any concerns to a crew member. FAs should communicate it to the flight deck if they too cannot explain your concern.