113312 From United States of America, joined Apr 2005, 553 posts, RR: 1 Reply 4, posted (8 years 4 months 3 weeks 3 days 13 hours ago) and read 1939 times:
While we are looking at these, please note that all B720 series planes have turbocompressors on the inboard engines only. Most turbofan B707-320 series have turbocompressors on engines 2, 3 and 4. Some operators, like American Airlines opted for turbocompressors on the inboard engines on all of their B707s (120 and 320 series), and all Rolls Royce 420 series along with Pratt 120 and 320 turbojet models have pylons with inlets on all four but not all actually have the turbocompressors in each. Many varients and options on the Boeings.
DeltaGuy From , joined Dec 1969, posts, RR: Reply 7, posted (8 years 4 months 3 weeks 2 days 9 hours ago) and read 1697 times:
If you look at the FE's panel in detail, you'll see that the #1 engine doesn't have all of the accessories that 2,3, and 4 have...no TR, no turbo, nothing like that. I asked an FE on one when I was flying one for a few hops with the Omega Tanker, he just said that's how it worked with Boeing apparently, a 4th set of engine accessories wasn't needed.