diamond
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UPS 727's With Tay Engines - Inlet?

Sun Feb 25, 2007 6:38 am

When UPS re-engined their 727's with Tay engines, why was it necessary to change the #2 inlet size and shape?

The original inlets on the -100 series were oval (as compared to the round ones on the -200). They appeared larger than the ones now used by UPS. Did they actually want to reduce the flow going into the #2 engine?
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N231YE
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RE: UPS 727's With Tay Engines - Inlet?

Sun Feb 25, 2007 8:12 am

Quoting Diamond (Thread starter):
When UPS re-engined their 727's with Tay engines, why was it necessary to change the #2 inlet size and shape?

The RR Tay's have a much higher bypass ratio than the original JT8Ds. The RR Tay has a much larger inlet due to this, and thus requires a modification of the #2 engine intake and S-Duct.

Take note however, that on the JT8D-200 conversion of the 727 (ie, MD-80 engines on the #1 and #3), engines #1 and #3 are retrofitted, but #2 does not. Maybe cost to modify the S-Duct?
 
aogdesk
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RE: UPS 727's With Tay Engines - Inlet?

Wed Feb 28, 2007 10:48 pm

If I remember correctly, the Tay mod S Duct has a much larger diameter (very obvious when inside the duct), and the JT8 vortex generators are no longer necessary. That helps to reduce the potential for ripping your pooper to shreds when sliding down the duct  Smile
 
BAE146QT
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RE: UPS 727's With Tay Engines - Inlet?

Wed Feb 28, 2007 10:55 pm

Quoting Aogdesk:
when sliding down the duct

Stupid question alert. No-one ever *really* slid down the duct did they?

"Wheee!" followed by a noise like a bowling ball hitting a stack of tin cans as you run into the fan...
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aogdesk
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RE: UPS 727's With Tay Engines - Inlet?

Thu Mar 01, 2007 1:04 am

I'm willing to bet that many people did in fact slide down the duct. If you factor in every maintenance station around the world that has more than 6 mechanics and consider that there's always gotta be one nutjob in there, I think its safe to assume that more than one forehead made serious contact with the bullet as the ride came to an abrupt halt.  Smile Of course, I'd also bet that there were also many unintentional slips that led to some shredded skin.
 
N231YE
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RE: UPS 727's With Tay Engines - Inlet?

Thu Mar 01, 2007 1:31 am

Quoting Aogdesk (Reply 4):

Nah, I think the L1011 may have a better slide!  wink 
 
BAE146QT
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RE: UPS 727's With Tay Engines - Inlet?

Thu Mar 01, 2007 9:20 pm

Quoting Aogdesk:
very maintenance station around the world that has more than 6 mechanics and consider that there's always gotta be one nutjob in there,

Put it that way, the laws of probability almost [/]demand[/i] it!

I'm guessing that some sort of inspection of the fan would be required, assuming the individual got caught? My back-of-a-beermat maths  Wink suggests that a 160lb man sliding along at 5-10 MPH would impact with way less force than a 2-3lb seagull at 250 knots, (ignoring the rotational velocity of the blades themselves in the case of a birstrike*).






*I'm going to go ahead and assume that no mechanic would deliberately slide down the intake of a running jet engine.
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BrowntailWhale
Posts: 182
Joined: Thu Oct 18, 2001 5:17 am

RE: UPS 727's With Tay Engines - Inlet?

Sat Mar 03, 2007 12:06 pm

There is an access door on the bottom of the S duct, just in front of the engine, that is accessible from the aft stairs. UPS mechanics must open this door and check the fan of the engine for ice and snow during winter weather. There is a light on the overhead panel that illuminates if this door is not latched.

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