Stitch From United States of America, joined Jul 2005, 28466 posts, RR: 84 Reply 3, posted (1 month 3 weeks 21 hours ago) and read 2067 times:
Quoting Web500sjc (Reply 2): Wasn't the 400D mostly a paper change? I know they took the winglets off but not much else was changed?
I believe there were modifications to the undercarriage and other cycle-limited parts to increase their longevity. The upper deck window belt is also longer due to the aft space normally used for the galley instead having seating.
The other way around : ANA modified two 747-481 aircraft to the 481D configuration (shortend wing + removal of the winglets), to produce a short haul aircraft in 2003 at the former Boeing Military Airplanes facility (Wichita).
However the fuselage was AFAIK not fully upgraded to the real 744D's specification.
Both aircraft are already sold and converted again by Bedek, now as a 747-481BDSF(again with wingextension and winglets) before the cycle count became to high.
Aircraft involved :
1133 28282 747-481 R2716 RT756 ANA
1142 28283 747-481 R2724 RT757 ANA
[Edited 2013-10-15 08:50:28]
On a twin, crossing an ocean, you're always one engine failure from a total emergency.