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Why Are These Engines "plugged"?  
User currently offlineBrenintw From Taiwan, joined Jul 2006, 1644 posts, RR: 1
Posted (7 years 9 months 2 days 9 hours ago) and read 3098 times:


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Looking at this image from the ABX thread, I noticed that the engines on the DC-8 have yellow "plugs" in front of the blades. I've seen this on similar aircraft of similar vintage (QF's 707 comes to mind).

What is the purpose of these plugs? Is it to stop the fans windmilling? What is the procedure for putting them in place?

I've only noticed them on older aircraft, so I'm assuming they're simply impractical for modern high-bypass engines (anyone want to fit one to a 777-300ER engine?)

Thanks
Bren


I'm tired of the A vs. B sniping. Neither make planes that shed wings randomly!
9 replies: All unread, jump to last
 
User currently offlineOPNLguy From , joined Dec 1969, posts, RR:
Reply 1, posted (7 years 9 months 2 days 9 hours ago) and read 3085 times:

They keep stuff from being blown in the engines during the ground time. You can also seem them when passenger aircraft with rear-mounted engines (MD-80s mostly these days) are catered.

User currently offlineFr8Mech From United States of America, joined Sep 2005, 5444 posts, RR: 14
Reply 2, posted (7 years 9 months 2 days 7 hours ago) and read 3022 times:

Different operators have different procedures and criterea for installinf the plugs/covers. We install them when the weather requires it (snow/ice). And yest, there are covers for high bypass engines.


When seconds count...the police are minutes away.
User currently offlineBrenintw From Taiwan, joined Jul 2006, 1644 posts, RR: 1
Reply 3, posted (7 years 9 months 2 days 7 hours ago) and read 3018 times:

Quoting Fr8Mech (Reply 2):
And yest, there are covers for high bypass engines

Thanks for that. How in heaven's name do you install a cover for a engine for a 777-300ER? Those engines are pretty hefty in size.



I'm tired of the A vs. B sniping. Neither make planes that shed wings randomly!
User currently offlineFr8Mech From United States of America, joined Sep 2005, 5444 posts, RR: 14
Reply 4, posted (7 years 9 months 2 days 3 hours ago) and read 2942 times:

Don't know about the GE90 class engines, but we have covers for the CF6 & PW4000 engines. They are large plastic tarps (for lack of a better word) that go over the inlet and have a fasteneing system so that they are installed on the engine.

Big, unwieldy and effective.



When seconds count...the police are minutes away.
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 5, posted (7 years 9 months 2 days 2 hours ago) and read 2911 times:

On Low Bypass Engines We use Inlet & Exhaust Plugs
On High Bypass Engines We use a Flexible High strength plastic sheet that can be attached to the Sides.
Its to avoid FOD when Aircraft are parked for prolonged period of time.
regds
MEL



Think of the brighter side!
User currently offline57AZ From United States of America, joined Nov 2004, 2550 posts, RR: 2
Reply 6, posted (7 years 8 months 4 weeks 1 day 1 hour ago) and read 2625 times:

Like the others have said, to prevent FOD. One big concern is birds building nests in the cowlings. Many GA piston engined aircraft have similar plugs that fit into the engine cowlings for the same reason.


"When a man runs on railroads over half of his lifetime he is fit for nothing else-and at times he don't know that."
User currently offlineSlamClick From United States of America, joined Nov 2003, 10062 posts, RR: 68
Reply 7, posted (7 years 8 months 4 weeks 18 hours ago) and read 2564 times:

Quoting OPNLguy (Reply 1):
(MD-80s mostly these days) are catered.

Catering truck pulls up just forward of the MD-80 engine. Engine is at about shoulder level for the caterers on the raised platform of their truck. Caterers unpack meals and supplies in the aft galley generating trash and miscellaneous empty carrying containers.

True or false: The caterers, sooner or later will rest something inside the engine inlet for the moment.

Assuming the above to be true:

True or false: The object left in the engine inlet by the caterers was something they had no further need for and simply needed to get it out of their way, off their hands for a moment.

Assuming the second question it true:

True or false: The caterers will remember to remove the object from the inlet.

Assuming the third question to be false:

True or false: The object left in the engine inlet by the caterers will be visible from the ground during the pilot walkaround or from the flight attendant work areas in the aft galley.

Grade your own work.



Happiness is not seeing another trite Ste. Maarten photo all week long.
User currently offlineZANL188 From United States of America, joined Oct 2006, 3522 posts, RR: 0
Reply 8, posted (7 years 8 months 4 weeks 18 hours ago) and read 2551 times:
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Quoting SlamClick (Reply 7):
Catering truck pulls up just forward of the MD-80 engine. Engine is at about shoulder level for the caterers on the raised platform of their truck. Caterers unpack meals and supplies in the aft galley generating trash and miscellaneous empty carrying containers.

True or false: The caterers, sooner or later will rest something inside the engine inlet for the moment.

Assuming the above to be true:

True or false: The object left in the engine inlet by the caterers was something they had no further need for and simply needed to get it out of their way, off their hands for a moment.

Assuming the second question it true:

True or false: The caterers will remember to remove the object from the inlet.

Assuming the third question to be false:

True or false: The object left in the engine inlet by the caterers will be visible from the ground during the pilot walkaround or from the flight attendant work areas in the aft galley.

Grade your own work.

Is it possible to get a catering truck into the rear door of a MD80 ?!?

Back in the day when pax 727s were still prominent, it was common practice for caters handling 727-200s to strap an inlet cover to the trucks work platform safety railing. When the truck was in place (at the rear door) SOP was to put the cover in first, do your business, then remove the cover before pulling out.



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User currently offlineSlamClick From United States of America, joined Nov 2003, 10062 posts, RR: 68
Reply 9, posted (7 years 8 months 4 weeks 17 hours ago) and read 2528 times:

Quoting ZANL188 (Reply 8):
Is it possible to get a catering truck into the rear door of a MD80 ?!?

Actually I think not. Truth is, I was thinking about the 727-200. The ten foot plug behind the wing made the gap from wing trailing edge to engine inlet pretty wide.



Happiness is not seeing another trite Ste. Maarten photo all week long.
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