BALandorLivery From UK - England, joined Jan 2005, 360 posts, RR: 1 Posted (9 years 8 months 6 days 9 hours ago) and read 3028 times:
Hi all, I have noticed in some photos of Southwest's 737-300's and 737-500 there are no EFIS screens. The flight deck resembles that of a 737-200. I thought that all 737-3/4/500 had an electronic ADI and HSI, I know that the early ones had analogue engine displays, but these still had an electronic ADI and HSI.
My question is, why have southwest got 737-300's and 500's with a completely old style flight deck.
777STL From United States of America, joined Dec 2004, 3642 posts, RR: 3
Reply 3, posted (9 years 8 months 6 days 4 hours ago) and read 2828 times:
"Was it a request for commonality with its 737-200's to save costs?"
I believe so. I know on SW's 73NGs Southwest specifically requested the EFIS screens be formatted to have an analog style to simplify commonality. I believe they're the only airline to request the EFIS screens be formatted in such a way.
ShyFlyer From , joined Dec 1969, posts, RR:
Reply 4, posted (9 years 8 months 6 days 2 hours ago) and read 2750 times:
I believe analog style instruments (ADI, HSI) were standard equipment. EFIS was optional. Southwest was not the only operator of analog 733 & 735s. I'm sure you could probably find 734 cockpits with full analog instrumentation.
As for the NG cockpits, I agree with 777STL that it was Southwest who prompted Boeing to offer the two display styles. However, SWA was not the only customer for the EFIS style NG cockpits (not a comprehensive list):