User avatar
HAWK21M
Topic Author
Posts: 29867
Joined: Fri Jan 05, 2001 10:05 pm

Blade Tieing Practice.

Tue Jul 28, 2009 5:03 pm

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.
I may not win often, but I damn well never lose!!! ;)
 
fr8mech
Posts: 6580
Joined: Mon Sep 26, 2005 9:00 am

RE: Blade Tieing Practice.

Tue Jul 28, 2009 7:59 pm

Everywhere I've worked the practice has been discouraged if not completely deemed 'against the rules'.
When seconds count...the police are minutes away.
 
wn700driver
Posts: 1475
Joined: Wed Aug 29, 2001 10:55 pm

RE: Blade Tieing Practice.

Tue Jul 28, 2009 11:19 pm

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.
Base not your happiness on the deeds of others, for what is given can be taken away. No Hope = No Fear
 
User avatar
jetmech
Posts: 2316
Joined: Wed Mar 29, 2006 2:14 am

RE: Blade Tieing Practice.

Wed Jul 29, 2009 9:53 am



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 :shock: .
 
User avatar
HAWK21M
Topic Author
Posts: 29867
Joined: Fri Jan 05, 2001 10:05 pm

RE: Blade Tieing Practice.

Wed Jul 29, 2009 5:14 pm



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.
I may not win often, but I damn well never lose!!! ;)
 
User avatar
jetmech
Posts: 2316
Joined: Wed Mar 29, 2006 2:14 am

RE: Blade Tieing Practice.

Thu Jul 30, 2009 6:22 am



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 :shock: .
 
User avatar
HAWK21M
Topic Author
Posts: 29867
Joined: Fri Jan 05, 2001 10:05 pm

RE: Blade Tieing Practice.

Thu Jul 30, 2009 9:05 am



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.
I may not win often, but I damn well never lose!!! ;)
 
AA737-823
Posts: 4887
Joined: Wed Mar 01, 2000 11:10 am

RE: Blade Tieing Practice.

Tue Aug 04, 2009 1:51 am

Why not just tie it to the stator blades behind?
 
User avatar
jetmech
Posts: 2316
Joined: Wed Mar 29, 2006 2:14 am

RE: Blade Tieing Practice.

Tue Aug 04, 2009 4:06 am

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 :shock: .
 
User avatar
HAWK21M
Topic Author
Posts: 29867
Joined: Fri Jan 05, 2001 10:05 pm

RE: Blade Tieing Practice.

Tue Aug 04, 2009 10:22 am



Quoting JetMech (Reply 8):

Any tying used on the RB211-535s?
regds
MEL......
I may not win often, but I damn well never lose!!! ;)
 
User avatar
jetmech
Posts: 2316
Joined: Wed Mar 29, 2006 2:14 am

RE: Blade Tieing Practice.

Thu Aug 06, 2009 4:45 am



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 :shock: .
 
User avatar
HAWK21M
Topic Author
Posts: 29867
Joined: Fri Jan 05, 2001 10:05 pm

RE: Blade Tieing Practice.

Thu Aug 06, 2009 8:00 am



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

On the -535C not on the -535E4.
regds
MEL.
I may not win often, but I damn well never lose!!! ;)
 
boeing767mech
Posts: 804
Joined: Fri Dec 15, 2000 5:03 pm

RE: Blade Tieing Practice.

Thu Aug 06, 2009 6:38 pm

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
 
fr8mech
Posts: 6580
Joined: Mon Sep 26, 2005 9:00 am

RE: Blade Tieing Practice.

Thu Aug 06, 2009 8:02 pm

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.
 
citationjet
Posts: 2249
Joined: Sun Mar 09, 2003 2:26 am

RE: Blade Tieing Practice.

Thu Aug 06, 2009 11:17 pm

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 avatar
HAWK21M
Topic Author
Posts: 29867
Joined: Fri Jan 05, 2001 10:05 pm

RE: Blade Tieing Practice.

Fri Aug 07, 2009 9:05 am



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.
I may not win often, but I damn well never lose!!! ;)

Who is online

Users browsing this forum: sccutler, SooLineRob and 33 guests