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Subject: 407 rotor smoothing with the RADS
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helofixerUser is Offline
JH Member
JH Member
Posts:19

06/11/2008 10:10 PM  
Found some shear bearings in the head of our 407 separating. Changed bearings. spent 2.5 days and 30 flights to get the aircraft in track. RADS gear constantly not seeing the blades, no matter what angle of the ABT, painting and repainting the blades. Night tracking is worse. Finally took all hub weight off, zeroed the tabs and set links to nominal setting and started from scratch. Took about 9 ground runs and 8 flights to get the ride close to spec and the crew ride to be ok. We have been using the RADS on our 206's and never really have problems. 407's is a nightmare every time, no matter which 407 we use it on (we own 2 and work on 2 other aircraft. Anyone else have this much problem with the RADS? Do you use any other system? I know it takes time, and Ive been wrenching on 407's for 7 years and 206's for 14, but it seems half the time the corrections the box says to use do not produce results...ride gets worse and takes way too much time and effort to smooth the rotor. Any input?
helofixerUser is Offline
JH Member
JH Member
Posts:19

06/14/2008 7:41 PM  
Update: After finally getting the aircraft in track, I decided to contact RADS customer support and got an interesting reply regarding tracker errors and partial errors on an aircraft with GARMIN 430 or 530 gps/radios. Yep. the problem child I was working on had the Garmin and was turned on. Seems a Bell CSR was having a nightmare of a time getting an aircraft tracked due to tracker camera errors. He even tried 2 different tracker cameras and data acq units and even different wiring and accelerometers. They shut off the garmin and had no other problems! And in doing more reasearch, comes to find out that a lot of people in the field are having problems with Garmin equipped 407's using the RADS. So if you are getting a lot of errors and you have a Garmin, turn it off and see if that improves things.
MikemvUser is Offline
JH Guru
JH Guru
Posts:59

07/03/2008 9:58 AM  
Helo Fixer, good info about Garmin interference. I had ser#53035 and learned some other things about 407 & RADS. First, when beginning make sure to clear all Rads memory. Second, make all moves with weights and flats as indicated but only bend tabs when one degree or more is called for. Do not try to bend tabs for 1/2 degree and such. After the first or second run, program the RADS for "NO" Tabs thus only using weights & flats. When you get close, program for "One Best Move" and also RADS at the A/C usual cruise weight if possible. About 4 flights should get the job done, Mike
helofixerUser is Offline
JH Member
JH Member
Posts:19

07/04/2008 12:26 AM  
Thanks for the heads up Mike. We routinely delete all other saved flights from our RADS and compress the hard drive before we even start. Since we only have the old fashioned tab gauge and bender, we don't even try to make tab adjustments if they ask for less than 1 degree. When we are having problems getting good solutions,we routinely option out moves that we think will make the ride worse not better. I will look into the best one move option and the Garmin radio interference. Its just very frustrating to spend hours and hours putting hub weight in, cranking on pc links, tabbing up then down, then putting the weight on a different/opposite blade, taking pc link back out, and then having to fight camera errors and partial readings when each flight takes 20 minutes or so to finish if you are lucky. So you might get 2 flights and adjustments per hour and chase your tail. Burn gas, eat up cycles and RINS and get no where. Ive posted my RADS problems in many forums and get a lot of sympathetic responses and just as many tips and hints. Seems to me that I am not the only one having problems with the RADS on the 407. There has got to be an easier more effective way. Rich
407MechUser is Offline
JH Newbie
JH Newbie
Posts:1

03/22/2009 12:44 AM  
One other tidbit about camera errors. Along with pointing it away from the sun, don't try to take readings sitting on white concrete, find the blackest dirt or asphalt surface you can.
Craig
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Forums > JH Alternate Forum > Helicopter Mechanics Forum > 407 rotor smoothing with the RADS



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