Mali government 707

[alex94]

Request for either the newer or slightly older livery of TZ-TAC if the mali government ☺

[Deleted]

What engines are those? They do not look like 707 engines to me??

[aerofoto - HJG Admin]

Looks like the P&W JT8D-219 development applied to some B707´s from the 1990´s.

As per my B707/720 history ....

By the 1980´s all civil operators whom retained their B707´s were obliged to Hush-Kit (or retire) these aircraft in order to continue operating legally under new noise regulations.

During the early 1990's Comtran International Inc; developed Q-707 nacelle/Hush-Kits, featuring a lengthened intake cowling and extended exaust tail pipe which reduced noise sufficiently to meet Stage 2 requirements.

From 1996 Quiet Skies Inc; in conjunction with Burbank Aeronautical Corp2; further advanced this concept to produce Stage 3 compliant hush-kits which were publicly demonstrated by B707-3J6B N717QS at the 1998 Farnborough Air Show.

Also developed and tested on this aircraft were 8ft.10in winglets which resulted in drag rduuction with a corresponding 7% improvement in overall fuel economy.

More recently the Seven Q Seven Group (comprising of EADS-Dornier, Goodrich Aerospace, Nordham Group, Omega Air, and Pratt & Whitney) re-engined a single B707-320B with P&W JT8D-219 turbofans rated at 22,000lb/st e/a. This aircraft was redesignated B707-RE and first flew on August 21 2001.

Flight testing revealed both a 22% improvement in overall fuel economy, reduced smoke emission, and noise reduction well within Stage 3 limitations.

The P&W JT8D-219 turbofan engine has also been selected to replace ageing, noisey, dirty, and less fuel efficient P&W TF33 series fanjet engines (based on the original P&W JT3D fanjet engine series of the 1960´s) which still power much of the USAF JSTARS & AWACS inventory.

Mark C
BOG/CO

[alex94]

Theyre stage III jt3's. Jt8d has more of a buldge along the bottom

[aerofoto - HJG Admin]

Some civil aircraft production lists state TZ-LAC was JT3D-7 and later HK3 upgraded .... and it probably was .... BUT .... I´m pretty sure you´ll find the engines evident within each of the above 2 reference images are actually JT8D-219´s (a later upgrade again .... not only the nacelle/cowl shape, but, the exhaust end of these engines too, tends to suggest this) .... and which are Stage 3 or later compliant .... in accordance with my historical notes above.

Stage 2, and 3, upgrades of original JT3D SERIES engine, on B707´s, looked quite different.

A link to a much earlier HJG discussion on this subject .... during 2013 .... covering these details ....

tonymadgehjg.proboards.com/thread/6415/which-707s-use-hushkits?page=1

Mark C
BOG/CO

[Deleted]

Thanks all for explanations.

Looks like DC-8 engines to me LOL

[aerofoto - HJG Admin]

They´re not long nacelle/ducted-fan type JT3D-3B or D-7 type fanjet engines such as those of the DC-8-62/-63 .... so far as I´m aware.

Mark C
BOG/CO