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About Marc Ebelini
(Top Expert on this page)

Expertise
Basis aircraft and engine maintenance. Avionics and other electronic questions related to computers and radio communications.

Experience
FAA licensed comercial pilot, A&P mechanic, former authorized inspector, ground instructor certified in aircraft, powerplant and radio navigation. FCC commercial license.

   

You are here:  Experts > Science > Aerospace/Aviation > Aerospace/Aviation

Questions Answered By Expert  Marc Ebelini 
In Category  Aerospace/Aviation

SubjectDate Asked

Inspections11/10/2009
  Q: Marc, I'm confused about 100-hour & annual inspections. I recently purchased an aircraft and the ...
  A: Actually I answered your question. It's matter of semantics. As I mentioned the 100 hour inspection ...
Intermitted Transponders11/10/2009
  Q: Question re intermittent transponders: Set-up: There are two transponders installed in my plane, ...
  A: Sure a lot of info to digest. Since the problem started with the first transponder let's start with ...
Inspections11/5/2009
  Q: Marc, I'm confused about 100-hour & annual inspections. I recently purchased an aircraft and the ...
  A: The annual and 100 hour are basically the same except that the annual requires an authorized ...
Microphone voltage10/29/2009
  Q: Does a typical aircraft radio supply voltage to the headset microphone? I have an electret mic that ...
  A: Originally the old aircraft radios used carbon mic's that used the voltage to excite the carbon ...
ATC / ATM9/9/2009
  Q: sir i m doing ME(AVIONICS). i want to do my project related to air traffic control / air traffic ...
  A: Sorry I am not an employment counselor but hope this gentlemen can answer your question. He is the ...
Future job intrest9/7/2009
  Q: I was considering going into Aerospace Engineering, But I mostly want to stay within the atmosphere, ...
  A: Hope this gentlemen can help you. He is the VP of Enrollment Management, Mr. Don Bishop at ...
Cause of a Cracked Intake Valve9/6/2009
  Q: Not too long ago, my dad's plane (a Cirrus SR22-GTSx G3 Turbo, if that helps) went in for its ...
  A: There can be many reasons for a cracked valve. To determine the exact cause would require additional ...
windmills8/31/2009
  Q: I am trying to make a windmill. Please look at my sketch. Can you think of an answer to my two ...
  A: While windmills are not my thing I do know a little about aerodynamics. Your drawing is a little ...
Air pressures8/28/2009
  Q: I was wondering what are the comparisons of the pressure an astronaut experiences in space to that ...
  A: The pressures are opposite. At sea level an open gage reads "0" pressure when actually the pressure ...
Distance Study in MS in Avonics8/22/2009
  Q: I have completed my BE in Electronics and communication from India and i am presently working in a ...
  A: Hope this gentlemen can help you. He is the VP of Enrollment Management, Mr. Don Bishop at ...
MS in Avionics8/20/2009
  Q: I have completed BE in Electronics & Communication(2009) planning to pursue higher Studies in ...
  A: Hope this gentlemen can help you. He is the VP of Enrollment Management, Mr. Don Bishop at ...
King KX-155 Audio Out8/5/2009
  Q: How does this radio connect to a single ended audio panel? Can the LO signals be strapped to ground? ...
  A: With rare exceptions all electrical items should share a common ground. The ground is the reference ...
PTT trouble7/24/2009
  Q: I'm working on a radio install on an ultralight using a Vertex VXA-220. Basicly running an extension ...
  A: Let's get some info on the Radio. It appears to be a straight forward aircraft type system where an ...
PTT trouble7/23/2009
  Q: I'm working on a radio install on an ultralight using a Vertex VXA-220. Basicly running an extension ...
  A: I'll try to analyze your problem but not knowing the details of your equipment I will make ...
Geometric Tolerancing in space industry7/15/2009
  Q: I was wondering how geometric tolerancing is used in the space industry. If you are unable to answer ...
  A: This question should be directed at NASA. In the mid sixties I remember attending a meeting where ...
position of aero engineers in airlines7/6/2009
  Q: I want to get job in airlines and airport.what is the working position of aeronautical engineer in ...
  A: Instead of using the I cannot answer this question section because this is not a technical question ...
Avionics-EGPWS6/17/2009
  Q: Is it possible to install an EGPWS in an aircraft that does not have a FMS computer? Is there any ...
  A: I am no longer in the avionics business to give more up to date information on EGWPS or TAWS ...
2 differnt comm in 1 audio panel6/11/2009
  Q: I am laying out new comm,to replace the old collins radio..Here's the problem that im ...
  A: Had no luck in getting pin out info for the equipment you want to wire in your aircraft. However ...
Speed of light5/28/2009
  Q: i have a question that who did the successful experiment of calculating the speed of the light? i ...
  A: This sounds like a home work question but I will say that the first correct close guess was James ...
aviation and aerospace5/26/2009
  Q: differentiate between aviation and aerospace engineering
  A: Aviation deals with vehicles that fly in the earth's atmosphere and aerospace deals with vehicle ...
Cessna-152 wing and nose gear5/18/2009
  Q: Could you tell me when the wing struts on a Cessna-152 are unbolted, how are the wings kept in ...
  A: Let's answer the last question first. I have never seen a specification on the force required to ...
Radio Static Onset5/18/2009
  Q: I have a 1964 Cessna 172 with a King KX-170B xcvr and a COM 120 xcvr. I was in the air when I ...
  A: If problem has just surfaced then you are looking at a failure of a component. Since I don't know ...
Plane trails4/22/2009
  Q: after watching airplanes in flight at different altitudes I am wondering why the contrails are so ...
  A: While this question may be a little out of my ares of expertise. As a pilot. I've known the the ...
non direcectional and omni-directional3/8/2009
  Q: why ndb is non-directional and not omni-directional, when both transmit in all direction. ANSWER: ...
  A: It was a poor question because the writer knew what he was talking about but did not phase it ...
non direcectional and omni-directional3/7/2009
  Q: why ndb is non-directional and not omni-directional, when both transmit in all direction.
  A: Is this a quick question? Non directional and omni direction are the same thing. If it is omni it ...
Brake pedals12/7/2008
  Q: I was wondering how it can be that pedals in an airplane are used both for braking and for ...
  A: First of all not all aircraft use the rudder pedals as the brake pedal. Neither are all aircraft ...
Wiring 2 transceivers to intercom11/25/2008
  Q: Like a previous question reference wiring to comm radio to an intercom - no audio selector panel. We ...
  A: You could have some time if you acquired the wiring diagrams for the radios. Most companies will ...
Wiring 2 transceivers to intercom11/14/2008
  Q: Like a previous question reference wiring to comm radio to an intercom - no audio selector panel. We ...
  A: okay I got the picture and my recommendations that obviously says rewire the system and end up ...
Wiring 2 transceivers to intercom11/14/2008
  Q: Like a previous question reference wiring to comm radio to an intercom - no audio selector panel. We ...
  A: Let me begin by saying that what you have sounds like a mess. First of all trying to modify or add ...
Early jetliner wings11/10/2008
  Q: The early jet airliners tended to have clean wings, both on the top and underside except for the ...
  A: While I don't have any detailed information to answer your question because I never worked for ...
Aeronauticals8/31/2008
  Q: what is the relationship between aeronautical engineering and mechanical engineering and is it ...
  A: While my job is to answer technical questions I'll attempt to help you. Mechanical engineering is a ...
aircraft switches7/29/2008
  Q: How do i interface an intercom to two kx 170b radios with speaker switch in system, existing wiring ...
  A: This becomes a tricky question because I have no idea of how it was originally wired. To begin with ...
Aviation Institute of Mechanics7/9/2008
  Q: My stepson is talking to people at Aviation Institute of Mechanics in Lawrenceville, GA. I am ...
  A: Sorry I don't know much about that school. However I will say that as an old vintage A&P mechanic as ...
aerospace and aeronautical engenering6/30/2008
  Q: sir i am 10th studying student i want to ask you that if we can do both aerospce and aeronautical ...
  A: I get so many e-mail from students like yourself and I can only refer them to web sites like ...
Maintenance5/19/2008
  Q: I own a Cessna 150 and have some questions about how to proceed. My ELT Battery needs to be ...
  A: You did not mention the type of ELT but I'll give my own opinion as to what I did when in business. ...
AMTENNA ON AIR FORCE ONE5/13/2008
  Q: ON THE LOWER SIDES 0F THE OLDER AIRFORCE ONE VC-137B THERE ARE WHAT APPEAR TO BE ANTENNAS THAT ARE ...
  A: Finally received a challenging question. So challenging I am hesitant to respond. Remember there are ...
Devices on aircraft wings?4/22/2008
  Q: On the trailing edges of many aircraft wings and horizontal stabilizers I see multiple "string/cord ...
  A: You won't believe this, but they are simply static wicks needed to drain the electrical charge off ...
Avionics4/12/2008
  Q: lam an Indian student.I've completed my Undergraduation in Electronics and communication. I wish to ...
  A: Avionics is a specialized field geared to electronics as applied to aircraft. I am not a employment ...
job oppurtunities in NASA usa in Avionics3/30/2008
  Q: plz send me ur MAIL ID i want to be in touch with to know about avionics and systems integration. i ...
  A: Think you have missed the point. I am not an employment consular. I answer technical questions, but ...
Engines3/18/2008
  Q: What is the power rating in horsepower of some common commercial light aircraft engines? For ...
  A: Sorry to say I do not maintain a data base for such information. Jet engines are not rated in ...
Interested In Aircraft Maintenance Engineering3/8/2008
  Q: Marc hope everythings good at your end. Mr.Marc i am an engineer with major in Electronics and ...
  A: To work on aircraft you need a mechanics license. These will vary from country to country. In the ...
Avionics...2/24/2008
  Q: Sir, Im Doing my Electronics and communication engg presently (3rd yr).Im very much interested in ...
  A: www.erau.edu will take you to the Embry Riddle web site that can help you. While electronics is a ...
transponder (cessna 152)2/17/2008
  Q: does the solid-state blind encoder transponder works same as the static system works for the ...
  A: Actually I answered all your questions but apparently you are still confused. But first I must ...
transponder (cessna 152)2/17/2008
  Q: does the solid-state blind encoder transponder works same as the static system works for the ...
  A: "The tubing that connects this opening goes to your static reading instruments whether it be ...
transponder (cessna 152)2/17/2008
  Q: does the solid-state blind encoder transponder works same as the static system works for the ...
  A: The static system is required to read the outside air pressure so that the pressure altitude is ...
confusing for future study2/13/2008
  Q: what is aircraft maintainance enginnering?
  A: Aircraft maintenance engineering applies to many areas of aircraft maintenance. From designing the ...
Supercritical Airfoils and Shockwave2/11/2008
  Q: the min. pressure point on this type of wing is somewhere at mid-chord. After this point, the ...
  A: You appeared to have answered your own question. Beyond that I cannot offer any further detail. ...
Question2/8/2008
  Q: Can i get a short note on "reliability of aircraft engines and power plant" ANSWER: On what extent ...
  A: Without getting into any exact details about maintenance this should satisfy your short note ...
Question2/7/2008
  Q: Can i get a short note on "reliability of aircraft engines and power plant"
  A: On what extent do you want reliability information. Statistical information is kept by the FAA ...
separation point vs transition point11/23/2007
  Q: I'm very confused about separation point vs transition point in the airfoil. what's the differences ...
  A: My studies of aerodynamics goes back to the 1940's so new terms are sometimes used. The transition ...
Push to talk switch11/21/2007
  Q: My push to talk switch has fell apart it has 4 wires red black white and ground and two switches ...
  A: Glad I was able to help. Don't know what was accomplished in your aircraft but PTT is very simple. ...
Push to talk switch11/20/2007
  Q: My push to talk switch has fell apart it has 4 wires red black white and ground and two switches ...
  A: I said you need a double pole switch instead of two switches. You tie the grounds to the common and ...
Push to talk switch11/20/2007
  Q: My push to talk switch has fell apart it has 4 wires red black white and ground and two switches ...
  A: You don't mention if the switch is hard wired into the system or uses a plug to go into the mike ...
Scope of Avionics9/16/2007
  Q: sir, I am Arslan from Pakistan.I have gotten Admission in avionics engineering at CAE,Pakistan. ...
  A: Which is better? That's is open to what you perceive is better. Higher pay or better working ...
engine assembly by a private a&p/ia8/21/2007
  Q: Mr Marc: my friend and i have 2 to 3 hi time 1966 io 360 continental in sky masters that need ...
  A: Living in Florida is too far for me to help I would not know anyone in your area. An engine with no ...
Information8/12/2007
  Q: I Mohd Younus Ahmed from INDIA did my Bachelor of Technology in Electronics & Instrumentation ...
  A: Now you have me confused. You can work in any field you want regardless of your degree. In the ...
Information8/12/2007
  Q: I Mohd Younus Ahmed from INDIA did my Bachelor of Technology in Electronics & Instrumentation ...
  A: Did you followup and contact Embry Riddle? An educational institute are the only ones that can ...
Information8/11/2007
  Q: I Mohd Younus Ahmed from INDIA did my Bachelor of Technology in Electronics & Instrumentation ...
  A: I am not familiar with the education in your country but I will try to response the best I can. The ...
guided missile7/11/2007
  Q: Does the guided missiles really exist and are used for real missions? Can they really follow a ...
  A: This is not my area of expertise but I will answer the best I can. Of course there are guided ...
Need help regarding space engineering6/18/2007
  Q: I have BTECH dgree in electronics & Communication engg and working on Flight Management System with ...
  A: Sorry, but my area of help is technical, not employment issues. Have no idea why Allexperts keeps ...
Aviation engineering vs Aerospace engineering5/30/2007
  Q: I am 12 standard student from India, and just got selection in iit. I have to choices, one is ...
  A: Basically we are dealing with two areas of expertise. Mainly the difference evolves the environment. ...
the wide body jet aircraft5/28/2007
  Q: explain the impact the wide body jet aircraft on the aviation industry with regard to passenger ...
  A: It's simple economics. Getting a large number of people from one place to another is cheaper. Let me ...
System analysis and control engineering5/10/2007
  Q: respected Marc Ebelini, I'm an aerospace engineering student studying in ...
  A: Normally my job is to try to answer technical questions related to aircraft maintenance. First let ...
Jet engine shutdown3/25/2007
  Q: Hallo! Many jet engine shutdown procedures require you to run the engines at a certain RPM above ...
  A: All engines including piston type have unique metallurgical problems that must addressed. In all ...
Experts Needed for dissertation2/21/2007
  Q: I am requesting your assistance on my dissertation entitled, "The Impact of Emerging Technology in ...
  A: Read your criteria and I don't meet it. Been away from aviation for twenty five years although I can ...
definition of pressure sensors1/31/2007
  Q: How about the way they are measured. Does the pressure transmitter measure amps and the transducer ...
  A: Now apparently you want to know about pressure sensors. Which of course are part of the transducer. ...
definition of pressure sensors1/25/2007
  Q: Is there a difference between an oil pressure transducer and an oil pressure transmitter? Do both ...
  A: Not that I am aware of. They both do the same thing so I think it's a matter which way you look at ...
Old altimeter?12/18/2006
  Q: I found an old, black guage at an estate sale that has on its face "The Bryant Heater & Mfg. Co.", ...
  A: It's obvious not an aircraft altimeter. To research it further I would go see if the company has a ...
Bonanza Yoke PTT Switch10/2/2006
  Q: Where can I find a replacement Push to Talk Switch for a BE 55 Baron Yoke. The head broke off of ...
  A: Cannot answer your question because I do not know if the switch was a retrofit or original ...
Pulsejet9/3/2006
  Q: I want the methodology design of thermodynamics and Aerospace for Pulsejet Engines.
  A: Have no idea as to how much information you need. Basically pulse jets are like the old gasoline ...
space8/5/2006
  Q: hey i would appreciate if you could help me out, thank you. if i were to land in mars, how would i ...
  A: Sorry but you are asking the wrong person, my area is aviation not space technology. Can only tell ...
avionics7/22/2006
  Q: i m anupam goyal from india and i have just finished my bachelars in aeronautical engineering with ...
  A: To earn the biggest paycheck you would need to work for one of the large aircraft companies. That ...
Avionics7/1/2006
  Q: I am an Indian girl,doing my final year currently in ECE EnGG. Can you tell me what exactly does ...
  A: Avionics is the application of electronics in aviation. It applies to the sales installation and ...
kerosen oil fuel5/19/2006
  Q: the kerosene oil that used in aeroplane as a fuel,is it common kerosene oil as we use in our home?or ...
  A: You are asking how crude oil is broken down to the various grades. That requires the question to be ...
Transponder Strobe Line4/13/2006
  Q: I had a local avionics shop install a Garmin 300XL GPS/Comm in my plane for VFR use, with later ...
  A: Please bear with me as my KT75 training certificate dates back to the early 70's and I no longer ...
Piston Engine CHT & EGT2/13/2006
  Q: How are you? I am a flight instructor for airplane. I could not find clear answer about piston ...
  A: Do not mix CHT with EGT as they represent two different problems. CHT has to do with cylinder head ...
Greetings, Are there DVD's...11/25/2005
  Q: Greetings, Are there DVD's available that provide a detailed explanation on the following: - FMS - ...
  A: What you ask for would normally would be part of the flight training manual supplied by Boeing to ...
fly-by-wire11/2/2005
  Q: What are the differences between flight control characteristics or Boeing aircraft and Airbus ...
  A: Sorry cannot answer your question because I do not fly or know anyone who flies this type of ...
Reciprocating engines10/20/2005
  Q: Yours is one of very few AllExperts profiles which may be compatible with the nature of my question, ...
  A: This is an easy one. The propellers had to be pulled through at least two revolutions to make sure ...
airframe hours9/24/2005
  Q: My name is Christian Rouse, and I work within the British MOD and I am trying to research a method ...
  A: Mr. Rouse: Recording airframe hours can be accomplished in many ways. Originally, there was two ways ...
contrails6/2/2005
  Q: i work on this site as well, answering questions about brewing. anyway ive always wondered why ...
  A: I have to be honest with you I never heard of the vapor trails being sinister. They are natural ...
Lear Jet 24 engine5/17/2005
  Q: --TO explain more since you said you didnt fully understand. I just figured I would update the ...
  A: If your asking about updating the engines on that old aircraft then you should be contacting ...
Lear Jet 24 engine5/16/2005
  Q: I would like to buy a Lear 24 but since the aircraft is built in the late 60's or early 70's, would ...
  A: I do not fully understand your question but will attempt to give you some input. The age of an ...
Push to talk button5/4/2005
  Q: The push to talk button on my Piper Warrior no longer seems to work. Do you have any suggestions on ...
  A: The push to talk button is wired parallel to the push to talk button for your microphone. Let me ...
Dear Sir: Would you please...4/18/2005
  Q: Would you please explain me the following abbreviations and introduce me some sources especially ...
  A: There are numerous abbreviations and fortunately I know the first three. It started out as ECM, ...
I apologise for not giving...4/14/2005
  Q: I apologise for not giving you my background before shooting out my question. I have a Commercial ...
  A: I am surprised that someone with your background would ask this question because this is standard ...
I am very interested in gaining...4/12/2005
  Q: I am very interested in gaining more knowledge on detailed desription, function and use of the ...
  A: Sorry for the delay in responding. Your question is quite involved since we are talking about ...
Armature testing2/2/2005
  Q: We repair (rewind) armatures and need to confirm that the replacement winding is exactly the same ...
  A: Since this question was asked in the aviation section of, this web site I must assume the repaired ...
I want to read compass for...1/10/2005
  Q: I want to read compass for example: 76'w and what does it mean of longtitude and lattitude. what ...
  A: Let's not confuse compass heading with Lat & Lon. 76 degrees means just that. Magnetic north is 76 ...
CF6-80C2A5F FADEC ENGINE10/30/2004
  Q: WHAT IS THE FUNCTION AND LOCATION OF THE THRUST BALANCE CHAMBER?
  A: Unfortuneately I am not familiar with that engine. However, the term is used in describing the area ...
help10/5/2004
  Q: as u enquired abt my interest is in propulsion and space technology like rockets missiles etc but i ...
  A: Space and super sonic speed technology is the future. Because the advanced studies are not taught in ...
help9/30/2004
  Q: i m anupam goyal and a student of section A of aeronautical society of india. i wish to know which ...
  A: Sorry I didn't write sooner but all these hurricanes here in Florida have put us behind schedule. ...
can i still get my a&p7/7/2004
  Q: I need to know if i can still get my a&p.i am currently a marine i have been working on harriers for ...
  A: I have been asked this question before and while I am not a lawyer I can quote the FAR's. I will ...
Turbo Fan &Turbo Jet Engines5/23/2004
  Q: Respected Sir, What are the predominant features of the Turbo Fan Engines, that makes them ...
  A: Adding the larger ducted fan in front of the turbine allowed the engines to ingest more air at lower ...
Aircraft Structure (Jet Engine's Location)5/3/2004
  Q: Why the Jet Engines are located below the wings? Is there any structural advantage? (Please answer ...
  A: Prime consideration is keeping the top of the wing clean for better lift. Placing the engine on top ...
Aero Engine / Power Plant4/20/2004
  Q: Do port and starboard engines on a 737 for example spool-up in opposite directions and do propellors ...
  A: Jet engines spool up the the same direction. All commercial propellor aircraft rotate counter ...
aviation3/11/2004
  Q: Respected expert I am faisal , flight dispatcher , from Pakistan. I have some questions . 1-what are ...
  A: In question one,are you refering to stages in a turbine engine? Question two. Where did you find ...

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