I was looking up reference photos of JT9D-powered 747-200s in the a.net photo database when I came across this airplane:
Being more or less what I was looking for, I went to see more photos of this serial number, and found this:
Still labeled as serial 20887 / line number 245, but now it has GE CF6s on it. I figured this was two different airplanes sharing the same information by some a.net database error, as those are common enough, but several other websites also say this is the same plane. Is it? From what I understand, this type of reengining is quite rare and usually only done on prototypes, so I'd like to know more.
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Re: 747 serial 20887 - change of engine mfr.?
It is rare, but it does happen. A handful of the 747 classics got their engines swapped out, there's more info here: viewtopic.php?t=768933
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- skipness1E
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Re: 747 serial 20887 - change of engine mfr.?
It was the orphan of the Atlas Air fleet as they standardised on the CF6, hence they re-engined this one aircraft. N809MC was one of their early deliveries.
It remains rare however.
It remains rare however.
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- 747classic
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Re: 747 serial 20887 - change of engine mfr.?
Four 747-200 series aircraft were re-engined from the P&W JT9D series to the General Electric CF6-50E(2) series.
- L/N 202 (msn 20682), the first USAF's airborne command post, switched from JT9D-7A to CF6-50E engines during the E-4A/E-4B upgrade process
- L/N 204 (msn 20683), the second USAF's airborne command post, switched from JT9D-7A to CF6-50E engines during the E-4A/E-4B upgrade process
- L/N 245 (msn 20887), a 747-228F, is one of two commercial engine conversions. Atlas Air had it switched in 1999 from JT9D-7J to CF6-50E2 engines, for optimising the Atlas 747 freighter fleet on one engine type.
- L/N 253 (msn 21048), a 747-212B(SF) was the other Atlas conversion.
The certification of the re-engine Service Bulletin (SB) from the P&W JT9D-7 to the GE CF6-50E engine was (partly)paid by the USAF and Boeing (and for the first time performed at the 747-100 prototype. RA001 was only several months during 1973 powered by the GE CF6-50 engine series, after GE/747 certification was finished it was reverted back to PW power
Atlas Air used the same SB and used the CF6 pylons and derated CF6-45A2* engines from secondhand ex, ANA 747SR-81 aircraft, purchased for spare parts in 1999 (N8078H, N8078Q, and N8078M) for fleet standarization to GE CF6-50E2
* CF6-45A2 engine : Same as CF6-50E2 except for reduced ratings specified at increased flat rating ambient temperature.
See also : viewtopic.php?t=1428741
- L/N 202 (msn 20682), the first USAF's airborne command post, switched from JT9D-7A to CF6-50E engines during the E-4A/E-4B upgrade process
- L/N 204 (msn 20683), the second USAF's airborne command post, switched from JT9D-7A to CF6-50E engines during the E-4A/E-4B upgrade process
- L/N 245 (msn 20887), a 747-228F, is one of two commercial engine conversions. Atlas Air had it switched in 1999 from JT9D-7J to CF6-50E2 engines, for optimising the Atlas 747 freighter fleet on one engine type.
- L/N 253 (msn 21048), a 747-212B(SF) was the other Atlas conversion.
The certification of the re-engine Service Bulletin (SB) from the P&W JT9D-7 to the GE CF6-50E engine was (partly)paid by the USAF and Boeing (and for the first time performed at the 747-100 prototype. RA001 was only several months during 1973 powered by the GE CF6-50 engine series, after GE/747 certification was finished it was reverted back to PW power
Atlas Air used the same SB and used the CF6 pylons and derated CF6-45A2* engines from secondhand ex, ANA 747SR-81 aircraft, purchased for spare parts in 1999 (N8078H, N8078Q, and N8078M) for fleet standarization to GE CF6-50E2
* CF6-45A2 engine : Same as CF6-50E2 except for reduced ratings specified at increased flat rating ambient temperature.
See also : viewtopic.php?t=1428741
Re: 747 serial 20887 - change of engine mfr.?
Thank you for the information!
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