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Search: Posts Made By: Sink
Forum: RV-12 08-10-2016, 01:19 PM
Replies: 14
Views: 1,980
Posted By Sink
This is a test question in the Line maint. class....

This is a test question in the Line maint. class. It is #18.
For this question we'll use the 912ULS since that is what most have.

What is the 5th trigger coil used for?
The answer is: It is the...
Forum: RV-12 08-06-2016, 01:20 PM
Replies: 47
Views: 9,875
Posted By Sink
Here is an article I copied and pasted from...

Here is an article I copied and pasted from another website, but it has made its rounds. It's worth reading and may help you. Good general info.

"" Understanding the Ground Adjustable...
Forum: RV-12 07-18-2016, 01:54 PM
Replies: 53
Views: 12,932
Posted By Sink
You can not have any control device or switch in...

You can not have any control device or switch in the cockpit that would allow a pilot access labeled or not. According to the FAA it has to be ONLY accessible and changeable on the ground. The rules...
Forum: RV-12 07-18-2016, 09:12 AM
Replies: 53
Views: 12,932
Posted By Sink
Just some background. The FAA is not the one...

Just some background.
The FAA is not the one that placed the in-flight adjustable prop limitations. It was the 4 big players during the inception from the fat Ultralight community that specified...
Forum: RV-12 07-07-2016, 03:06 PM
Replies: 6
Views: 1,150
Posted By Sink
If this is a sudden occurrence then it is more...

If this is a sudden occurrence then it is more likely a poor connection or sender. It would be rare to have the pressure increase after time versus decrease.
Forum: RV-12 06-26-2016, 12:06 AM
Replies: 26
Views: 7,474
Posted By Sink
Coolant hoses can ooze or leak when exposed to...

Coolant hoses can ooze or leak when exposed to heating and cooling cycles and especially in cold weather it may shrink a tad and the clamps being a different material don't keep up. The rubber will...
Forum: RV-12 06-25-2016, 11:55 PM
Replies: 6
Views: 1,246
Posted By Sink
The two I hear owners talk about all the time is...

The two I hear owners talk about all the time is Avlabs and Blackstone. I kind of favor Avlabs for several reasons. This is part of good record keeping. Once a year after about 200 hrs. seems to be...
Forum: RV-12 06-25-2016, 11:54 PM
Replies: 83
Views: 22,137
Posted By Sink
After talking to the head Phd researcher a few...

After talking to the head Phd researcher a few years back from Sensenich and he said they thought the pins would work well, but not as good as they hoped, but looked good on paper. They set their...
Forum: RV-12 06-25-2016, 11:40 PM
Replies: 28
Views: 10,573
Posted By Sink
Springs typically break from excessive vibration...

Springs typically break from excessive vibration and or the spring metal hardness is too hard which makes them brittle or they are being over extended. If McFarland springs show a break pattern then...
Forum: RV-12 06-14-2016, 08:22 AM
Replies: 12
Views: 4,834
Posted By Sink
It's not a good practice. This isn't a Cont. or...

It's not a good practice. This isn't a Cont. or Lycoming engine. Turn the engine off and then the fuel is all that is needed.
Forum: RV-12 06-14-2016, 08:20 AM
Replies: 15
Views: 7,050
Posted By Sink
High readings on occasions are common especially...

High readings on occasions are common especially with silicone. It is not cause for alarm. It can come from several sources. Look for trends and not always a single test. If a reading is serious...
Forum: RV-12 05-22-2016, 11:20 PM
Replies: 9
Views: 3,995
Posted By Sink
What was wrong with the Vans and Rotax checklist?

What was wrong with the Vans and Rotax checklist?
Forum: RV-12 05-22-2016, 11:19 PM
Replies: 21
Views: 3,717
Posted By Sink
Do not allow any header wrap on the EGT probe.Do...

Do not allow any header wrap on the EGT probe.Do not over wrap or under wrap the probe. The header cloth should be at least 1/8" + away from the probe. Neither Dynon nor Rotyax know the exact cause...
Forum: RV-12 05-16-2016, 10:48 AM
Replies: 7
Views: 2,295
Posted By Sink
There is no minimum CHT for the Rotax 912. It...

There is no minimum CHT for the Rotax 912. It only cools the heads from overheating.

Those with thermostats may get to see it up around 180F, but if the OAT's are cold enough that could be affected...
Forum: RV-12 04-26-2016, 05:05 PM
Replies: 22
Views: 4,816
Posted By Sink
25 hr. oil change intervals for 100LL is indeed...

25 hr. oil change intervals for 100LL is indeed in writing and should be followed. Don't use 50 hr. for 100LL or after a few hundred hours you may wish you hadn't.

We highly recommend oil changes...
Forum: RV-12 04-24-2016, 06:49 PM
Replies: 7
Views: 1,348
Posted By Sink
If you use a heat sink paste then use the same...

If you use a heat sink paste then use the same one that goes on the spark plugs. That was what it was originally designed for. Electronic heatsink.
Forum: RV-12 04-24-2016, 06:43 PM
Replies: 22
Views: 4,745
Posted By Sink
Hi John, Air in the line with fluctuating oil...

Hi John,

Air in the line with fluctuating oil pressures on new installs are quite common. I get this question and see this quite often. It usually goes away after a flight. How fast it goes away...
Forum: RV-12 04-24-2016, 09:08 AM
Replies: 22
Views: 4,745
Posted By Sink
"Or, if the oil pressure scale is Red at zero psi...

"Or, if the oil pressure scale is Red at zero psi and that is actually 12 psi then is it additive and the Lo pressure scale red/yellow is 12 psi --- then it's actually 24 psi?"

You do not need to...
Forum: RV-12 04-19-2016, 07:47 PM
Replies: 253
Views: 63,449
Posted By Sink
Vans RV12's seem have a high and disproportionate...

Vans RV12's seem have a high and disproportionate number of VR failures. We were just talking about this in class last month amongst some of the other instructors and IRC's. Most of us believe it has...
Forum: RV-12 04-05-2016, 03:40 PM
Replies: 19
Views: 4,898
Posted By Sink
Sorry I was trying to think and write. Sometimes...

Sorry I was trying to think and write. Sometimes it comes out jumbled and my typing isn't always spot on.
The carb inspection and bowl check is indeed 200 hrs.
Forum: RV-12 04-05-2016, 01:03 PM
Replies: 19
Views: 4,898
Posted By Sink
Hi Mitch, Fill out a Rotax CSIR and make a copy...

Hi Mitch,

Fill out a Rotax CSIR and make a copy of your logbook entry of the float replacement. Those should go to your service center where you purchased your floats. You will need to have the...
Forum: RV-12 03-18-2016, 11:12 AM
Replies: 19
Views: 7,813
Posted By Sink
The Aero Shell Sport Plus 4 in the red bottle is...

The Aero Shell Sport Plus 4 in the red bottle is a new formula from the black bottled Plus 4. It was studied with a few flight schools over thousands of hours. They changed the base stock a bit and...
Forum: RV-12 03-15-2016, 06:58 PM
Replies: 7
Views: 1,858
Posted By Sink
It is a white silicone based paste. It will...

It is a white silicone based paste. It will transfer up to 50F from the plug to the head. This will help to keep detonation at bay. Apply a thin film to the top half of the plug. Do not glob it on or...
Forum: RV-12 02-27-2016, 01:35 PM
Replies: 19
Views: 7,813
Posted By Sink
Hi Chrysopelea, Rotax like motorcycles share the...

Hi Chrysopelea,

Rotax like motorcycles share the same oil in the engine and gearbox. Automotive engines do not. Automotive oil does not have the same additives that motorcycle oil has in them. Using...
Forum: RV-12 01-23-2016, 09:42 PM
Replies: 50
Views: 9,896
Posted By Sink
I got a number of emails from Vans forum members...

I got a number of emails from Vans forum members for this post and ask for some pics and insight.

Here is a nice set of pics someone sent me in their...
Forum: RV-12 01-10-2016, 07:58 PM
Replies: 30
Views: 7,857
Posted By Sink
The corrosion in the picture is from water in the...

The corrosion in the picture is from water in the fuel. The new pumps are aluminum and water shows up this way. The old pumps were steel and water didn't affect them the same way. Slight corrosion...
Forum: RV-12 01-10-2016, 07:50 PM
Replies: 19
Views: 4,898
Posted By Sink
The old floats and the new floats are exactly the...

The old floats and the new floats are exactly the same composition. The difference is that the new floats have 3 acceptance test performed where the older floats only had two. The new additional test...
Forum: RV-12 01-06-2016, 12:13 PM
Replies: 42
Views: 17,680
Posted By Sink
Hi John, Nice job. If using unleaded fuel and...

Hi John,

Nice job.

If using unleaded fuel and doing the appropriate oil changes then tanks tend to remain quite clean. Using 100LL all the time and regular extended oil change intervals can...
Forum: RV-12 01-06-2016, 12:08 PM
Replies: 4
Views: 1,547
Posted By Sink
Hi Jro, 5.9 - 6.3 is normal. It isn't a sign of...

Hi Jro,

5.9 - 6.3 is normal. It isn't a sign of imminent failure. Next 100 hr or annual weigh them again to check.
In the meantime if you have no symptoms then I wouldn't worry. The symptoms for a...
Forum: RV-12 12-23-2015, 11:42 AM
Replies: 41
Views: 12,331
Posted By Sink
I know some don't want to hear this,...

I know some don't want to hear this, but
Sometimes it's just better to stick with the proper parts and not try and save a few bucks. If you blew a hose off in flight saving $100 could cost $16.5K if...
Forum: RV-12 12-23-2015, 08:17 AM
Replies: 41
Views: 12,331
Posted By Sink
The 17mm hose on top of the engine and the two on...

The 17mm hose on top of the engine and the two on each underside of the cylinders is made for Rotax by just one company. Unfortunately this hose has no US equivalent. I have seen some try and use use...
Forum: RV-12 12-23-2015, 08:01 AM
Replies: 30
Views: 7,857
Posted By Sink
Happy Holidays everyone :) First the corrosion...

Happy Holidays everyone :)

First the corrosion in the fuel pump.
The newer Corona fuel pumps are made of a different material and MFG'd differently than the older AC and Pierberg pumps. If water...
Forum: RV-12 12-15-2015, 07:06 AM
Replies: 8
Views: 2,068
Posted By Sink
One of the shops I was just at is using this...

One of the shops I was just at is using this balancer and I have heard of its use from several shops. They said it works very well and it's accurate.
I was told you should get the longer shaft....
Forum: RV-12 12-11-2015, 07:06 AM
Replies: 7
Views: 2,457
Posted By Sink
Once the mixture screw is set on the bottom of...

Once the mixture screw is set on the bottom of the carb at 1.5 turns out it usually never changes. It is spring loaded with an "O" ring so it keeps its set.
Adjusting these screws as written in the...
Forum: RV-12 12-11-2015, 06:55 AM
Replies: 4
Views: 1,833
Posted By Sink
Oil temps on a warm to hot day that go into the...

Oil temps on a warm to hot day that go into the yellow are not an issue for short term operation. The yellow is just there to get your attention and make you pay attention to a rising oil temp. Many...
Forum: RV-12 12-11-2015, 06:47 AM
Replies: 5
Views: 1,741
Posted By Sink
Each engine is a little different, but the...

Each engine is a little different, but the pressure could change by 10 psi from a very low idle to cruise rpms. Oil brands can also play a small factor here. The pressures differences can be from a...
Forum: RV-12 12-11-2015, 06:42 AM
Replies: 41
Views: 12,331
Posted By Sink
Hi Yankee-Flyer, When working to remove or...

Hi Yankee-Flyer,

When working to remove or replace the spring clamps under the air intake areas it is easier to just remove the 4 screws on each air intake manifold and this will allow you to lift...
Forum: RV-12 12-11-2015, 06:38 AM
Replies: 41
Views: 12,331
Posted By Sink
Spring clamps are used in many places in industry...

Spring clamps are used in many places in industry where pressures are low and piping or tubing may expand and contract. This is done because of thermal expansion and contraction. The spring clamps...
Forum: RV-12 11-20-2015, 04:01 PM
Replies: 42
Views: 17,680
Posted By Sink
Here is a copy and paste from the Rotax forum. It...

Here is a copy and paste from the Rotax forum. It is an eye opener for some. I guess I'll have to put these videos in my own file. This has all kinds of implications to this...
Forum: RV-12 11-17-2015, 06:25 AM
Replies: 42
Views: 17,680
Posted By Sink
The manuals do say to do an oil purge after a...

The manuals do say to do an oil purge after a tank cleaning because they assume you will drain oil from the hoses. If you want to do the purge by all means do it.

If done properly you don't need to...
Forum: RV-12 11-17-2015, 06:09 AM
Replies: 6
Views: 1,661
Posted By Sink
The carb jetting from factory doesn't change if...

The carb jetting from factory doesn't change if you use 2 individual air filters or one single large one. Some do change the jetting if they live at high elevations and fly high altitudes all the...
Forum: RV-12 11-04-2015, 11:14 AM
Replies: 17
Views: 4,088
Posted By Sink
It can be wiped off with something like laquer...

It can be wiped off with something like laquer thinner or anything like you would use to prep the metal for painting.
Forum: RV-12 11-04-2015, 10:06 AM
Replies: 17
Views: 4,088
Posted By Sink
First get the corrosion off. Then try. Boeing...

First get the corrosion off.
Then try.

Boeing uses a product called Boeshield T-9. It comes in a spray can and blocks out all moisture. I have used it a lot in saltwater and rainy environments and...
Forum: RV-12 11-04-2015, 09:57 AM
Replies: 28
Views: 5,792
Posted By Sink
The funnel idea I mentioned above I got from one...

The funnel idea I mentioned above I got from one of your RV12 users, works well and seems to keep everything clean. I forgot who told me about that idea.
Forum: RV-12 11-04-2015, 09:54 AM
Replies: 11
Views: 2,822
Posted By Sink
After Talking with a thousand Rotax users some...

After Talking with a thousand Rotax users some will say they check oil every flight, others first flight of the day and others only every few flights. You should being checking your oil. A good place...
Forum: RV-12 11-04-2015, 09:34 AM
Replies: 28
Views: 5,792
Posted By Sink
Some aircraft oil tank installs leave no option...

Some aircraft oil tank installs leave no option to access the oil tank drain plug so they do remove the tank to dump the oil which is perfectly acceptable.
Forum: RV-12 11-04-2015, 06:30 AM
Replies: 28
Views: 5,792
Posted By Sink
The concave style doesn't accept the drain valve....

The concave style doesn't accept the drain valve. Possibly a different valve MFG might work? You could contact Lockwood, Leading Edge or CPS and see if they have a flat style. I don't know if they...
Forum: RV-12 11-03-2015, 06:37 PM
Replies: 28
Views: 5,792
Posted By Sink
There are two types of plates in the bottom of...

There are two types of plates in the bottom of the oil tank. One is an earlier modle. One is flat and the tabs do face down with the flat high surface facing up. Then there is the concave one. With...
Forum: RV-12 11-02-2015, 08:33 PM
Replies: 19
Views: 5,768
Posted By Sink
Hi Yankee, If you want to do a complete prop...

Hi Yankee,
If you want to do a complete prop strike inspection by all means go for it. You evidently believe that scuffing a tip didn't cause any damage more than a scuff and you said it wouldn't be...
Forum: RV-12 11-01-2015, 08:26 PM
Replies: 19
Views: 5,768
Posted By Sink
If you believe there is enough evidence to...

If you believe there is enough evidence to inspect a gearbox then there is sufficient evidence to do a full and proper prop strike inspection and not do half a job.

Free advice has many values. :)
Forum: RV-12 11-01-2015, 07:04 PM
Replies: 19
Views: 5,768
Posted By Sink
I know Paul and he's a nice guy. I think he may...

I know Paul and he's a nice guy. I think he may have misspoke on this one.


Scuffing 1/16" to 1/8" off the blade tip with no slowing of the engine, no shattering of the prop, no stoppage of the...
Forum: RV-12 11-01-2015, 02:21 PM
Replies: 14
Views: 2,824
Posted By Sink
This is a fairly easy job that can be done with...

This is a fairly easy job that can be done with anti seize and every other annual. We usually apply it to both surfaces. It is easier to loosen slightly the exhaust pipe nuts to allow the pipes to...
Forum: RV-12 11-01-2015, 02:17 PM
Replies: 19
Views: 5,768
Posted By Sink
Hi Yankee, As you have described this minor brush...

Hi Yankee,
As you have described this minor brush with the prop tips this wouldn't constitue a prop strike that would need a gearbox and crankshaft inspection. Just fix your prop.
Forum: RV-12 09-29-2015, 09:03 AM
Replies: 6
Views: 1,900
Posted By Sink
If you block the residual flow gauge outlet it...

If you block the residual flow gauge outlet it should read the same as the test pressure gauge. If they do not match then you may want a new gauge.

Depending on what test pressure you use, 80 or 87...
Forum: RV-12 09-29-2015, 08:28 AM
Replies: 2
Views: 1,116
Posted By Sink
I'm not sure where you want to add the coolant,...

I'm not sure where you want to add the coolant, but it is very simple. If you need to add to the reservoir tank just add either more of the same coolant or distilled water to bring it up to the level...
Forum: RV-12 09-22-2015, 06:56 PM
Replies: 2
Views: 1,143
Posted By Sink
Look into the open end of the plug. You can see...

Look into the open end of the plug. You can see the metal pins and a small plastic tab above or below each pin. Take something pointy like a watch screwdriver or a dental pick and lift the plastic...
Forum: RV-12 09-22-2015, 06:53 PM
Replies: 3
Views: 1,223
Posted By Sink
If you hold the inspection certificate from the...

If you hold the inspection certificate from the FAA on your ELSA or hold an RLSM-A then yes you can do the ELT inspection and sign it off for your 100 hr/annual condition.
Forum: RV-12 09-12-2015, 10:19 AM
Replies: 41
Views: 12,331
Posted By Sink
Many tell me in class that they put heat...

Many tell me in class that they put heat shielding on the coolant hoses that are close to the hot exhaust. You can either take some fire sleeve (3"-5") and split it up the middle or buy some regular...
Forum: RV-12 09-11-2015, 10:24 PM
Replies: 41
Views: 12,331
Posted By Sink
13mm is 1/2" which is what most use on the oil...

13mm is 1/2" which is what most use on the oil hoses. Each Rotax service center uses a different hose for the 13mm (1/2") oil hose. The large coolant hoses are 25mm (1") and the Rotax supplied...
Forum: RV-12 08-31-2015, 02:54 PM
Replies: 9
Views: 2,287
Posted By Sink
AV-9 was an oil that was rebranded by the old...

AV-9 was an oil that was rebranded by the old California Power Systems just for them. The first formulas they tried had a few issues.
Since the reformulation and extensive testing done with flight...
Forum: RV-12 08-29-2015, 01:02 PM
Replies: 7
Views: 2,505
Posted By Sink
Use Halon in a ventilated area. Your cockpit is a...

Use Halon in a ventilated area. Your cockpit is a small confined space and will fill rapidly. Nothing really wrong with its use just open your fresh air vents.


What is Halon?
Halon (short for...
Forum: RV-12 08-29-2015, 12:53 PM
Replies: 41
Views: 12,331
Posted By Sink
Hi MMiller, I believe the 81mm comp tube is part...

Hi MMiller,

I believe the 81mm comp tube is part 956-391. Is this the number you eventually got?
The old part number used to be 956-141.

The 66mm tube is 956-143.
Showing results 1 to 62 of 114

 
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