Steve
Thank you for the suggestions. I really didn't know where to start searching as this is an unusual situation. I'll give them a try. I assume your local since you know the area?
Jerry
Some additional information: This vibration was noticeable for the first time about 400 hours ago (hobbs time). It has "come and gone" since then, but is now present about 99% of the time. When it initially appeared, it would gradually "peak" and "fall", with about 4-5 seconds between peaks with...
I know I'm reaching for a solution, as I've been dealing with this for quite some time. The service center's solution is to start buying/swapping parts. If there were a true "engineer" available to me locally, I would've already hired them! When the engine/lower pulley is at 2800rpm, the upper...
I've attached a spec sheet to the analyzer I have and a link to a parts catalog that will show you exploded views of the various systems on the helicopter. Any suggestions you might have as far as analyzer settings, sensor locations, etc. would be helpful. I am a mechanic/pilot, not an engineer...
TPL
The operational rpm of the enging during flight is 2700-2900 rpm, which varies the rotor rpm proportionately. Unfortunately the analysis equipment is not 100% accurate at the lower frequencies (rotor), so I've used 'about'. I have several pdf plots with notes (location of sensor, hovering...
Greg,
Thanks for the reply. This vibration is "new" and not normal. It registers as high as 1.5ips (inches per second)in the cabin at about 1350 cpm. The blades turn at approximately 450rpm. The rotor system itself registers about .07ips vertical and around .14 lateral. Anything under .2 is...
Hello Everyone,
Needing some help/ideas on locating abnormal vibration in Hughes 269 rotor system. Have been dealing with the "experts" in the industry, but absolutely no success in correcting this. I have a lot of vibration data logged with a MicrovibeII analyzer that can be emailed if...
