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They could have been re-engined one-for-one in the early 1980s with the 18,900 lbf JT8D-209 (certified 1979 for MD-80 airliners and for B727 re-engining (replacing the side-mounted engines) which were more fuel-efficient than the TF33s (JT3D) - and 4" smaller in diameter. The engine was retired from mainline airline use in 2020.

The late 1980s/early 1990s saw an opportunity for a one-for-one replacement program with the B-2's engine, the F118. This engine was flight-certified (for the B-2) in 1985 (and was also installed in the U2S fleet in 1998+), and is even 2.5" smaller in diameter than the JT8D-209 while using much less fuel than the TF33 (.375 lb/lbf/hr vs .510 for the JT8D-209 and .52 for the TF33-P-3).

A second chance for the JT8D-209 engine came in 2001 when the 200-series JT8Ds were certified as a TF-33 replacement engine for military and civilian use, and new 200 series JT-8Ds were produced as late as 2011 for some military aircraft.

<blockquote data-quote="BlackBat242" data-source="post: 659858" data-attributes="member: 9868">They could have been re-engined one-for-one in the early 1980s with the 18,900 lbf JT8D-209 (certified 1979 for MD-80 airliners and for B727 re-engining (replacing the side-mounted engines) which were more fuel-efficient than the TF33s (JT3D) - and 4&quot; smaller in diameter. The engine was retired from mainline airline use in 2020. The late 1980s/early 1990s saw an opportunity for a one-for-one replacement program with the B-2's engine, the F118. This engine was flight-certified (for the B-2) in 1985 (and was also installed in the U2S fleet in 1998+), and is even 2.5&quot; smaller in diameter than the JT8D-209 while using much less fuel than the TF33 (.375 lb/lbf/hr vs .510 for the JT8D-209 and .52 for the TF33-P-3).A second chance for the JT8D-209 engine came in 2001 when the 200-series JT8Ds were certified as a TF-33 replacement engine for military and civilian use, and new 200 series JT-8Ds were produced as late as 2011 for some military aircraft.</blockquote>

[QUOTE="BlackBat242, post: 659858, member: 9868"] They could have been re-engined one-for-one in the early 1980s with the 18,900 lbf JT8D-209 (certified 1979 for MD-80 airliners and for B727 re-engining (replacing the side-mounted engines) which were more fuel-efficient than the TF33s (JT3D) - and 4" smaller in diameter. The engine was retired from mainline airline use in 2020. The late 1980s/early 1990s saw an opportunity for a one-for-one replacement program with the B-2's engine, the F118. This engine was flight-certified (for the B-2) in 1985 (and was also installed in the U2S fleet in 1998+), and is even 2.5" smaller in diameter than the JT8D-209 while using much less fuel than the TF33 (.375 lb/lbf/hr vs .510 for the JT8D-209 and .52 for the TF33-P-3). A second chance for the JT8D-209 engine came in 2001 when the 200-series JT8Ds were certified as a TF-33 replacement engine for military and civilian use, and new 200 series JT-8Ds were produced as late as 2011 for some military aircraft. [/QUOTE]

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