BeechTalk - BT

Username Protected · **Posted:** 10 Feb 2018, 20:24

Username Protected wrote:

Be sure to bleed the hydraulic lines as well. You don’t want nitrogen in your fluid.

Is Skydrol and Nitrogen miscible? Brakes are solid now; manual didn't say anything about bleeding them but that's no big deal if you think it's a good idea?

Username Protected · **Posted:** 10 Feb 2018, 22:45

Username Protected wrote:

Be sure to bleed the hydraulic lines as well. You don’t want nitrogen in your fluid.

Is Skydrol and Nitrogen miscible? Brakes are solid now; manual didn't say anything about bleeding them but that's no big deal if you think it's a good idea?

Username Protected · **Posted:** 11 Feb 2018, 10:39

Username Protected wrote:

If you have your feet on the brake pedals when you pull the nitrogen handle you can backfeed nitrogen into the hydraulic fluid.

And risk rupturing the hydrolic fluid reservoir. At least that’s what they told us in initial.

Username Protected · **Posted:** 11 Feb 2018, 12:01

Skydrol is nasty stuff to both humans and machine. Be careful with it.

There are modern hydraulic fluids which are not nearly as nasty, but have higher flash points than 5606. For example MIL-PRF-83282 or MIL-PRF-87257.

Any reasons one couldn't STC their use instead of Skydrol? Or is there an SB that allows that already?

History of 5606, 83282, 87257:

http://www.radcoind.com/media/brief-his ... ic-fluids/

MIL-PRF-87257 flash point is is greater than 160C, Skydrol is 160C, so it seems like a better fluid all around.

Mike C.

Username Protected · **Posted:** 11 Feb 2018, 18:10

Username Protected wrote:

Be sure to bleed the hydraulic lines as well. You don’t want nitrogen in your fluid.

Is Skydrol and Nitrogen miscible? Brakes are solid now; manual didn't say anything about bleeding them but that's no big deal if you think it's a good idea?

Username Protected · **Posted:** 11 Feb 2018, 20:14

This is a simple system: Hydraulic for the brakes just like any other airplane. Nitrogen line for emergencies, Shuttle valve to allow nitrogen into the caliper if the hydraulic system ever failed (low probability, ever lost brakes in your bonanza?). Probably from sitting, the shuttle valve was stuck open allowing normal hydraulic brake operation to port fluid into the nitrogen lines. That fluid must have somewhere to go so it ports out in the nose gear well. If the shuttle valve was stuck the OTHER direction then yes, you'd have nitrogen porting into the hydraulic side but only if you tested the emergency brake valve system.

Really happy this problem is fixed; atomized skydrol is some of the nastiest stuff I've encountered in aviation.

Username Protected · **Posted:** 12 Feb 2018, 08:35

Username Protected wrote:

(low probability, ever lost brakes in your bonanza?)

I have. Left pedal went to the floor when I landed. It was fine 15 minutes before when I taxied out for take off.

Username Protected · **Posted:** 12 Feb 2018, 22:28

Username Protected wrote:

Really happy this problem is fixed; atomized skydrol is some of the nastiest stuff I've encountered in aviation.

I hated the days that they did the blowdowns in the factory or the service center at Gulfstream. That stuff was nasty and permeated even our uniform shirts a half hour later. Those things absorbed very little and came back clean. With skydrol in them the had to run them through the same stuff safetykleen used. Yuck!

Username Protected · **Posted:** 21 Feb 2018, 21:08

The manual has charts for sod strips; I just wanted to confirm that the Citation 501 is certified for grass strips. Any thoughts?

Username Protected · **Posted:** 21 Feb 2018, 22:31

Username Protected wrote:

The manual has charts for sod strips; I just wanted to confirm that the Citation 501 is certified for grass strips. Any thoughts?

Is there a difference?

Username Protected · **Posted:** 21 Feb 2018, 23:15

Quote:

I just wanted to confirm that the Citation 501 is certified for grass strips.

Probably... It would be in limitations. ( Limitaion for the CJ4 was a paved runway though)

There was a gravel runway kit ( reading about it in the Flight Safety 550 training manual) that had a nosewheel spin up using bleed air, to reduce the gravel spray on unimproved runways. I seem to recall it also had a guard behind the nosewheel and rock screens on the landing lights.

Username Protected · **Posted:** 22 Feb 2018, 11:16

Username Protected wrote:

How much extra fuel does the Branson tank give?

This is from the Sierra 2012 catalog. 120 gallons @$210k.

Gary

Username Protected · **Posted:** 23 Feb 2018, 01:26

Username Protected wrote:

The manual has charts for sod strips; I just wanted to confirm that the Citation 501 is certified for grass strips. Any thoughts?

My thought is that it's gonna piss off your landlord.

Username Protected · **Posted:** 28 Feb 2018, 01:16

Username Protected wrote:

There was a gravel runway kit ( reading about it in the Flight Safety 550 training manual) that had a nosewheel spin up using bleed air, to reduce the gravel spray on unimproved runways. I seem to recall it also had a guard behind the nosewheel and rock screens on the landing lights.

Gravel kit consisted of nose wheel spin up device, flap reinforcement, and minor other changes.

Very rarely seen in the wild, here is a 550 with one, look at the nose wheel:

Attachment:

550-gravel-kit-1.png

Mike C.

Username Protected · **Posted:** 08 Mar 2018, 15:05

Ran across the Klingon Jet on Google at Van Nuys.

https://www.google.com/maps/@34.2044685 ... 312!8i6656

Citation 501sp