Aer Lingus From Ireland, joined May 2000, 1560 posts, RR: 0 Posted (14 years 4 months 1 week 20 hours ago) and read 1099 times:
I was reading the remarks on one of the photos of N777UA, United's first 777. On it, it said that the one of the engines was a PW4077B and the other was a normal PW4077. What's the difference and why can planes have two different engines variations on them ?
Buzz From United States of America, joined Nov 1999, 697 posts, RR: 21
Reply 3, posted (14 years 4 months 2 days 20 hours ago) and read 870 times:
Hi Aer Lingus, Buzz here. I'll have to look on the computer at work, let you know early next week. I don't really know the 777 very well since they don't come to PDX.
We have a couple versions of the Bigfoot (ever seen their 6 wheel main gear on final aproach?) One version has a higher takeoff weight than the other, and has "stronger" engines.
Engine intemix is not unusual, we make sure the stonger engine matches the 'normal' engine so the pilots don't fly in circles.
And since we use our Bigfoots for ETOPS work, we're really careful about making sure there are few unpleasant surprises in flight. Remember, ETOPS also stands for 'Engines Turn Or People Swim"
Buzz Fuselsasage, Line Mechanic by night, DC-3 Crew Chief by choice.