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Blade Tieing Practice.  
User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Posted (5 years 5 months 3 days 3 hours ago) and read 3010 times:

Is Fan Blade Tieing to a surface/chock via rope an acceptable method to prevent rotation in windy conditions,apart from use of Engine blanks.
Is it done for any engine type worldwide?
regds
MEL.


Think of the brighter side!
15 replies: All unread, jump to last
 
User currently offlineFr8Mech From United States of America, joined Sep 2005, 5660 posts, RR: 15
Reply 1, posted (5 years 5 months 3 days ago) and read 2968 times:

Everywhere I've worked the practice has been discouraged if not completely deemed 'against the rules'.


When seconds count...the police are minutes away.
User currently offlineWn700driver From , joined Dec 1969, posts, RR:
Reply 2, posted (5 years 5 months 2 days 21 hours ago) and read 2932 times:

I have only ever seen this done on the Dash, and that was a prop. We used to tie those blades down to a notch on the engine nacelle to keep it from turning in the wind while PAX boarded/disembarked.

User currently offlineJetMech From Australia, joined Mar 2006, 2699 posts, RR: 53
Reply 3, posted (5 years 5 months 2 days 11 hours ago) and read 2869 times:



Quoting HAWK21M (Thread starter):

We always tied the fans of the RB211's (D4's) and JT9's, as the clanking was too annoying during windy conditions. Apparently, the impact between adjacent snubbers was not too good for the fan blade either.

Quoting Fr8Mech (Reply 1):

Fair enough. It was actually quite a common occurence at my first employer, whereby fan ties were accidentally left in when engines were spun up.

Regards, JetMech



JetMech split the back of his pants. He can feel the wind in his hair.
User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 4, posted (5 years 5 months 2 days 3 hours ago) and read 2813 times:



Quoting JetMech (Reply 3):
We always tied the fans of the RB211's (D4's) and JT9's

What was used to assist the tying,Was this an approved company SOP & if so was there any ref doc reffered to.
regds
MEL.



Think of the brighter side!
User currently offlineJetMech From Australia, joined Mar 2006, 2699 posts, RR: 53
Reply 5, posted (5 years 5 months 1 day 14 hours ago) and read 2745 times:



Quoting HAWK21M (Reply 4):
What was used to assist the tying,

For the RR's, there was a special fan tie. One end had a pin that fitted into one of the nose cowl lifting points. The other end had a plastic coated hook that went around the snubber. These two items were connected by a cord and bungee.

The bungee was tied into the cord such that it would stretch before the cord became fully taught, which cushioned any forces applied to the fan blade. For other engines, we used a length of light rope to tie the blades.

Quoting HAWK21M (Reply 4):
Was this an approved company SOP & if so was there any ref doc reffered to.
regds

I'd say so. For "A" checks, we had a folder detailing what inspections to carry out, and the appropriate MM references. Inserting fan ties would probably came under a general "A" check company procedure heading in this folder.

Regards, JetMech



JetMech split the back of his pants. He can feel the wind in his hair.
User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 6, posted (5 years 5 months 1 day 11 hours ago) and read 2727 times:



Quoting JetMech (Reply 5):
For the RR's, there was a special fan tie

Any Pic......What type RR are you referring to?
regds
MEL.



Think of the brighter side!
User currently offlineAA737-823 From United States of America, joined Mar 2000, 5947 posts, RR: 11
Reply 7, posted (5 years 4 months 3 weeks 5 days 19 hours ago) and read 2539 times:

Why not just tie it to the stator blades behind?

User currently offlineJetMech From Australia, joined Mar 2006, 2699 posts, RR: 53
Reply 8, posted (5 years 4 months 3 weeks 5 days 16 hours ago) and read 2522 times:

Quoting HAWK21M (Reply 6):
Any Pic......What type RR are you referring to?

Sorry, couldn't find any pictures. These fan ties were specifically for the D4. We did not use them for the G2.

Quoting AA737-823 (Reply 7):
Why not just tie it to the stator blades behind?

That's what we did for the GE and P&W. I suppose that a purpose made tie is quicker and easier to remove and install, and less likely to be left in.

Regards, JetMech

[Edited 2009-08-03 21:07:21]


JetMech split the back of his pants. He can feel the wind in his hair.
User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 9, posted (5 years 4 months 3 weeks 5 days 10 hours ago) and read 2485 times:



Quoting JetMech (Reply 8):

Any tying used on the RB211-535s?
regds
MEL......



Think of the brighter side!
User currently offlineJetMech From Australia, joined Mar 2006, 2699 posts, RR: 53
Reply 10, posted (5 years 4 months 3 weeks 3 days 16 hours ago) and read 2383 times:



Quoting HAWK21M (Reply 9):
Any tying used on the RB211-535s

Not too sure about this one Mel, as unfortunately, I never got to work on a 757. Do the 535's have mid span shrouds? It was the presence or absence of mid span shrouds that generally established whether we tied the fans or not.

On the RR's and P&W's, we generally did tie the blades when we were working on the engines, as the noise of the clappers hitting was very annoying. The GE also had mid span shrouds, but for some reason, the blade set fitted together much more tightly on the CF-6 than either the RR or P&W, so we rarely if ever tied the blades.

Regards, JetMech



JetMech split the back of his pants. He can feel the wind in his hair.
User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 11, posted (5 years 4 months 3 weeks 3 days 12 hours ago) and read 2365 times:



Quoting JetMech (Reply 10):
Do the 535's have mid span shrouds

On the -535C not on the -535E4.
regds
MEL.



Think of the brighter side!
User currently offlineBoeing767mech From United States of America, joined Dec 2000, 1031 posts, RR: 3
Reply 12, posted (5 years 4 months 3 weeks 3 days 2 hours ago) and read 2316 times:

you can do like the Air Force and put a 2x2 in the fan blades like they do on the C-5's

David



Never under-estimate the predictably of stupidty
User currently offlineFr8Mech From United States of America, joined Sep 2005, 5660 posts, RR: 15
Reply 13, posted (5 years 4 months 3 weeks 3 days ago) and read 2309 times:

I seem to recall having a procedure in the B747 100/200 AMM to tie the fan blades and run the engine, with the cowls off, for leak check. Throttle manipulation was prohibited and there was a note to watch EGT carefully at start to avoid a hot start. Anyone starting a JT9 knows to watch for a hot start anyway.

Never performed the procedure. We just took the cowls off, and watched carefully for 'evidence' of leakage. If we really suspected a leak that we were having trouble finding due to the bypass air, we would pull the cowl, pop it in reverse and run the engine.



When seconds count...the police are minutes away.
User currently offlineCitationJet From United States of America, joined Mar 2003, 2469 posts, RR: 3
Reply 14, posted (5 years 4 months 3 weeks 2 days 21 hours ago) and read 2291 times:

What about using a passenger seat belt on the blades of a 747?

http://www.boreme.com/boreme/funny-2007/china-air-p1.php



Boeing Flown: 701,702,703;717;720;721,722;731,732,733,734,735,737,738,739;741,742,743,744,747SP;752,753;762,763;772,773.
User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 15, posted (5 years 4 months 3 weeks 2 days 11 hours ago) and read 2254 times:



Quoting CitationJet (Reply 14):

What about using a passenger seat belt on the blades of a 747?

Thought of just that pic when this topic was started.
regds
MEL.



Think of the brighter side!
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