Spooling TRs in an EP? - Page 3

TYS A&P · 06-19-2008, 05:26 PM

Nightip wrote "I've always just spooled the TRs on shorter runways and/or contaminated runways"

Couldn't quote his comment.

What do you mean by contaminated runways? From the way I am reading it that's a good way to F.O.D. a engine. Alot of airlines run these aircraft without the TR's installed. I personaly don't like the TR's. It's belived that they cause a big problem with the horizontal stab bearing. We have been removing the horizontal stab alot for years cause the bearing is worn and the airlines without the TR's seem to never have to remove there horizontal stab.

GasPasser · 06-19-2008, 06:05 PM

Quote:

Originally Posted by TYS A&P

Nightip wrote "I've always just spooled the TRs on shorter runways and/or contaminated runways"

Couldn't quote his comment.

What do you mean by contaminated runways? From the way I am reading it that's a good way to F.O.D. a engine. Alot of airlines run these aircraft without the TR's installed. I personaly don't like the TR's. It's belived that they cause a big problem with the horizontal stab bearing. We have been removing the horizontal stab alot for years cause the bearing is worn and the airlines without the TR's seem to never have to remove there horizontal stab.

Contaminated Runway is pilot speak for water/snow/slush/ice, conditions where wheel braking is directly affected.

I don't think your Stab Bearing is from TR, since 95% of the pilot group doesn't spool TR regularly. Also, by the time TR spools up, what, if any aerodynamic force is being applied to the Horizontal Stab that would damage it?

leadmx · 06-28-2008, 10:40 PM

It is the vibrations caused by the TRs that is causing problems. The bushings in the stab tend to migrate out of position by a few mm for alot of diffrent reasons, but Embraer thinks it is made worse by the TRs. These planes have a history of vibrations in the tail, APU fire wall cracks, vert. stab. cracking on the "Z" mounts, all the flutter problems waaay back in the late '90s. It is true that these problems tend to be worse on the planes with TRs then W/out them, but that could also be diffrence in usage because of aircraft capabilities rather then TR usage. Besides, it gives us knuckle draggers something to do.

The way I look it is this; the H-Stab hinge pin is kinda important and it never hurts to look at once every 5,000 hours.

av8tr4610 · 06-29-2008, 08:55 AM

Quote:

Originally Posted by leadmx

It is the vibrations caused by the TRs that is causing problems. The bushings in the stab tend to migrate out of position by a few mm for alot of diffrent reasons, but Embraer thinks it is made worse by the TRs. These planes have a history of vibrations in the tail, APU fire wall cracks, vert. stab. cracking on the "Z" mounts, all the flutter problems waaay back in the late '90s. It is true that these problems tend to be worse on the planes with TRs then W/out them, but that could also be diffrence in usage because of aircraft capabilities rather then TR usage. Besides, it gives us knuckle draggers something to do.

The way I look it is this; the H-Stab hinge pin is kinda important and it never hurts to look at once every 5,000 hours.

Questions and answers like this is what makes this forum great.

erj-145mech · 06-29-2008, 05:51 PM

Quote:

Originally Posted by leadmx

It is the vibrations caused by the TRs that is causing problems. The bushings in the stab tend to migrate out of position by a few mm for alot of diffrent reasons, but Embraer thinks it is made worse by the TRs. These planes have a history of vibrations in the tail, APU fire wall cracks, vert. stab. cracking on the "Z" mounts, all the flutter problems waaay back in the late '90s. It is true that these problems tend to be worse on the planes with TRs then W/out them, but that could also be diffrence in usage because of aircraft capabilities rather then TR usage. Besides, it gives us knuckle draggers something to do.

The way I look it is this; the H-Stab hinge pin is kinda important and it never hurts to look at once every 5,000 hours.

I've seen many horiz stab hinge bearings migrated out during the 5A inspections also. Sometimes we can get them deferred until the next "C" if they are less than 2mm out.

leadmx · 06-29-2008, 09:48 PM

Bushing are a problem in general on the 145s. It is not uncommon to have aileron, speed brake/spoiler, rudder (until the spring mod) engine yokes, doors, quadrants, just about anything that has bushing in it to be migrated out of place at some point in time. The good news is, on the flight controls they can't come out past the washers on the bolts and we are finally getting some better fixes then just put it back in the hole with some sealant. We are required to measure the hole and replace the bushing and the fittings if they are not in tolerance. Now if we could just find a fix for the adjustment on the pilots seat armrest that keeps getting stuck we would really be doing something.:-D