EMBQA From United States of America, joined Oct 2003, 9348 posts, RR: 12 Reply 1, posted (8 years 5 months 2 days 4 hours ago) and read 6695 times:
I did several blade lubes on the Embraer 170 this spring. Since they share the same engine, I'm sure it's the same process. I was amazed at how fast you can have them all out and in. Take the spinner off, pull the pin and out come the blades.
Just an FYI for those that don't know what a Blade Lube is... Every so many hours.. I think its 800, the blades are removed and the attaching points are retreated with a baked on graphite coating. This is because the blades have a slight freedom of movement when at rest and the coating wears away as the blades move. Every engine manufacture is different so I'm not sure if this holds true to all engines......
[Edited 2005-07-12 21:49:57]
"It's not the size of the dog in the fight, but the size of the fight in the dog"
A/c train From United Kingdom, joined Jun 2001, 501 posts, RR: 4 Reply 12, posted (8 years 5 months 1 day 9 hours ago) and read 6451 times:
Aloges, the freedom of movement your talking about there with the 'clanking' is caused by the midspan shrouds hitting eachother as they go over the 12 o'clock position, at high rotational speeds the blades will lock out centrifugally and so the noise is unheard, this is why you must lube the sides of the shrouds aswell !!
With wide chord fan blades fitted too engines pictured above, the lube is an anti-frcition coating using molykote applied too the blade roots and the blade slots, if you've ever fitted wide chord fan blades, you'll notice there is not as much room in the blade slots as with the older CFMs and CF6's, they are a much tighter, they sometimes need to be 'encouraged' in with a soft blow mallet !!
Twin commander- depends on which engine you lubing the blades on, an RB211, will take around 4 hours if you need to do it quick !, a CF6-80C2-A5 has many component parts making up the blade set which all need to be lubed so I would say atleast 6 hours for a CF6.
UAL Bagmasher, blade lube is in the troubleshoot for high vibe after fan trim balance, sometimes easier just too go for a fan blade lube, can spend hours down an engine run bay, taking the spinner/fairing off moving weights around.
Air2gxs From , joined Dec 1969, posts, RR: Reply 13, posted (8 years 5 months 1 day 7 hours ago) and read 6422 times:
The fan lube on a CF6 comes in at about 15 man-hours. Since we added it to our line maintenace program, fan vibration problems have all but disappeared. When we do have a problem, we lube and it easily knocks a unit and-a-half off the indication (unless something is really wrong with the engine).
SkydrolBoy From Canada, joined Sep 2003, 341 posts, RR: 2 Reply 14, posted (8 years 5 months 1 day 6 hours ago) and read 6408 times:
Thats a 690 in the background, To do the Fan Lube on the RB211 the fastest I've done it was just 4hrs including a lunch break, but we were doing it outside on the ramp in the middle of the summer, so the graphite spray was drying as soon as it hit the fan blades, but a normal fan lube done in the hangar will take about 6-8hrs.
Salim From Lebanon, joined Jun 2001, 303 posts, RR: 1 Reply 18, posted (8 years 5 months 5 hours ago) and read 6231 times:
I would love to have one of these blades on my desk...they are really pices of art...
More seriously do you know if it's possible to buy on comming from an decomissoned engine, or they are all recycled??
LMP737 From , joined Dec 1969, posts, RR: Reply 19, posted (8 years 5 months 2 hours ago) and read 6210 times:
Quoting A/c train (Reply 12): UAL Bagmasher, blade lube is in the troubleshoot for high vibe after fan trim balance, sometimes easier just too go for a fan blade lube, can spend hours down an engine run bay, taking the spinner/fairing off moving weights around.
Spent almost an entire night doing that on a RB211. Run the engine, shut it down, move the wieghts around, draw those silly circles on the graph. Then repeat the whole process ove again.. The final fix ended up being a blade lube.
TwinCommander From United States of America, joined Apr 2005, 150 posts, RR: 0 Reply 22, posted (8 years 4 months 4 weeks 1 day 20 hours ago) and read 6156 times:
Im going to bother you again about that commander and I should have asked this before...
Those look like the old hamilton-standard propellers that were put on the century converted 681s.
If you have time... Could you snap a photo or get the info off the data tag?
We just did an inspection/lube of the fan blades of a G-IV, C/N 1051, N919CT. It took us about 4 days with one person... But I think they had to do some NDTs on other items before they threw her back together.
HAWK21M From India, joined Jan 2001, 31457 posts, RR: 57 Reply 23, posted (8 years 4 months 4 weeks 1 day 18 hours ago) and read 6149 times:
Quoting LMP737 (Reply 19): Spent almost an entire night doing that on a RB211. Run the engine, shut it down, move the wieghts around, draw those silly circles on the graph. Then repeat the whole process ove again.. The final fix ended up being a blade lube.
Isn't there a software Available that feed in the Weights & gives the best position of assy in terms of Balance,whicvh needs to be followed in case of reinstallation.
LMP737 From , joined Dec 1969, posts, RR: Reply 24, posted (8 years 4 months 3 weeks 3 days 1 hour ago) and read 5999 times:
Quoting HAWK21M (Reply 23): Isn't there a software Available that feed in the Weights & gives the best position of assy in terms of Balance,whicvh needs to be followed in case of reinstallation.
Not on the 757/RB211. You have to do it the old fashioned way. Protractor, vibe readings and a graph.
25 DL_Mech: At DL, we use the MTI-4100. Very easy to use (even on the RB-211), with no plots or graphs required. http://www.mtiinstruments.com/aviation/products/
26 LMP737: Another case of AA not wanting to spend the money on new "fandangled" equipment.
27 HAWK21M: Thats Surprising considering the Time & Fuel saved.Overall it would make a big difference to use Modern Equipment. Whats AA reasoning. regds MEL
28 LMP737: American on one hand is quite willing to spend the money to maintain their aircraft. On the other hand they are not into buying things that are "opti