Search found 3369 matches

by airplay
Mon Sep 10, 2001 2:14 am
Forum: Technical/Operations
Topic: Engines: Where's Force Applied?
Replies: 13
Views: 1560

RE: Engines: Where's Force Applied?

The thrust from a jet engine is produced by the rapid expansion of gasses. It is not developed by the power turbine. The power turbine simply transfers energy from the action of the escaping gasses to the compressor. As far as where the thrust reacts "against" my guess is that since the highest pres...

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by airplay
Sun Sep 09, 2001 6:25 am
Forum: Technical/Operations
Topic: Bus Tie Electrical Question
Replies: 8
Views: 42367

RE: Bus Tie Electrical Question

This is another example of a simple question that has no easy answer because there are so many different fundemental philosophies of electrical design from different aircraft manufacturers. First, as said before a bus tie connects 2 electrical busses together. Depending on the airplane, the normal p...

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by airplay
Sun Sep 09, 2001 6:08 am
Forum: Technical/Operations
Topic: Glass Cockpits
Replies: 12
Views: 1388

RE: Glass Cockpits

Technologically advanced "aircraft" I would say is the BD700 (Global Express). The clincher is the electronic load management system that replaces tons of circuit breakers. Now if you said "airliner" I would have to say it's a tie between 777/A330-A340 and Concorde....  <img src="/discussions/g...

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by airplay
Tue Sep 04, 2001 12:21 am
Forum: Technical/Operations
Topic: What Is The Philosophical Difference Between?
Replies: 63
Views: 5318

RE: What Is The Philosophical Difference Between?

I think this can all be answered using the "Nintendo" analogy. The Engineer Designs the Nintendo. The Skilled Production People Build the Nintendo. The Maintenance People Maintain the Nintendo. The dispatcher picks the game. The Pilot Plays the Nintendo. The Flight Attendant is there for customer se...

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by airplay
Tue Sep 04, 2001 12:06 am
Forum: Technical/Operations
Topic: Airbus 330-Both Engine Out
Replies: 26
Views: 3932

RE: Airbus 330-Both Engine Out

Junior,

ETOPS certification is not granted purely by having the right equipment. The company's maintenance and operating procedures and standards are also scrutinzed. This thread certainly is relevant to the discussion of ETOPS.

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by airplay
Tue Sep 04, 2001 12:00 am
Forum: Technical/Operations
Topic: How Much Rain Can A Jet Engine Take
Replies: 14
Views: 11598

RE: How Much Rain Can A Jet Engine Take

Prebennorholm, If water is heated it merely turns to water vapour. It doesn't simply "evaporate" unless it has a place to evaporate to. The answer to this question lies in FAA FAR 25 which is the certification basis of many (if not most) modern airliners. FAR 25 specifies that aircraft engines on th...

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by airplay
Sun Sep 02, 2001 11:47 pm
Forum: Technical/Operations
Topic: Please Give Me Feedback.
Replies: 5
Views: 1746

RE: Please Give Me Feedback.

Funny, You seem to imply that this airliner would be configured based on some knowledge of the load and the route. When would the configuration take place? How much lead time would they need? Even now with quick change engines, an engine change is not a "gate" procedure. A wing change would require ...

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by airplay
Sat Sep 01, 2001 12:42 am
Forum: Technical/Operations
Topic: Fly-by-wire
Replies: 13
Views: 2042

RE: Fly-by-wire

ARINC stands for Aeronautical Radio Incorporated. They just use the name "ARINC Incorporated" now. Among other things, they develop standards for avionics systems. The standards include information on installation, wiring, data buses, databases, and general guidance. Some even define the size of LRU...

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by airplay
Fri Aug 31, 2001 11:55 pm
Forum: Technical/Operations
Topic: GPS = Nonprecision App?
Replies: 15
Views: 1812

RE: GPS = Nonprecision App?

Whoops....yes I am wrong Thanks for the correction. I was using the word "precision" in the engineering context and not the pilot context and wrongly assuming they were interchangeable. A localizer offers lateral "precision" that the GPS cannot offer reliably, but a localizer only approach is not a ...

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by airplay
Thu Aug 30, 2001 11:54 pm
Forum: Civil Aviation
Topic: The Media Garbage When It Comes To Aviation
Replies: 14
Views: 2568

RE: The Media Garbage When It Comes To Aviation

Actually, pulling negative Gs on large aircraft can cause some pretty serious structural damage. It can (and often does) cause injury as well. The momentum of an 800,000 lb aircraft is alot more (do some math) than your 152 at any speed. A -1 G jolt is rather large. Many of the posts on this forum r...

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by airplay
Thu Aug 30, 2001 11:38 pm
Forum: Technical/Operations
Topic: GPS = Nonprecision App?
Replies: 15
Views: 1812

RE: GPS = Nonprecision App?

You don't need "glideslope" for precision approaches. There are plenty of "localizer only" precision approches out there. Also, if an aircraft has a GPS system or FMS system that allows the display of glideslope vertical guidance coincidentily with GPS lateral guidance, it doesn't meet the regulator...

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by airplay
Wed Aug 29, 2001 6:15 am
Forum: Technical/Operations
Topic: May I Suggest A New Format For Asking Questions?
Replies: 7
Views: 3161

RE: May I Suggest A New Format For Asking Questions?

I think this is a valid tech/ops topic. I don't think any of the "other" forums are not structured as a "question and answer" type format to the degree that this one is. Some sort of organization would help.

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by airplay
Wed Aug 29, 2001 5:46 am
Forum: Technical/Operations
Topic: Flaps At Altitiude
Replies: 24
Views: 4266

RE: Flaps At Altitiude

Yes.....why would a labour union lie to us?

 Smile

I believe this incident involves much which is open to interpretation. I've read enough to form my opinion at this point and I don't think it will change any time soon.

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by airplay
Wed Aug 29, 2001 5:43 am
Forum: Technical/Operations
Topic: May I Suggest A New Format For Asking Questions?
Replies: 7
Views: 3161

RE: May I Suggest A New Format For Asking Questions?

Maybe use the AT-100 standard for identifying subjects. 21 for air conditioning, 22 for autopilot, 23 for communications....etc. I'm sure anyone can find the code on the internet somewhere. The advantage of this system is that most aircraft maintenance personell are already familiar with the codes, ...

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by airplay
Sun Aug 26, 2001 2:02 am
Forum: Technical/Operations
Topic: Can
Replies: 5
Views: 1117

RE: Can

Although the certification basis of modern airliners include provisions for "ditching" in water, I've read somewhere that an airliner has not yet been "successfully" ditched yet. I think the definition of "successful" probably includes no loss of life and/or limited break-up of the airframe. Anyone ...

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by airplay
Sat Aug 25, 2001 3:11 am
Forum: Technical/Operations
Topic: B737 RMI Compass
Replies: 5
Views: 5812

RE: B737 RMI Compass

Yes FDXMech...you are right with respect to the 737-200. I think I confused the issue by making references to other systems. Sorry about that! There are a few different ways it's done. It depends on the system. A Sperry C-14 compass for instance moves the gyro. A Collins PN-101 system moves a syncrh...

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by airplay
Sat Aug 25, 2001 2:01 am
Forum: Technical/Operations
Topic: Lightning Divertor Strips.B737
Replies: 5
Views: 5283

RE: Lightning Divertor Strips.B737

I've also been told that the black ring may be an aid in identifying ice buildup. Some turboprop aircraft have a similar black ring on the prop spinner. Any BA flight crew out there that can clear this up?

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by airplay
Sat Aug 25, 2001 1:59 am
Forum: Technical/Operations
Topic: Lightning Divertor Strips.B737
Replies: 5
Views: 5283

RE: Lightning Divertor Strips.B737

I think the black ring you are referring to is merely a strip of conductive paint that ensures that the radome is electrically bonded to the airframe. A similar black strip can be found stradling rubber de-ice boots and wing leading edges on other aircraft that use pneumatic de-ice boots which are a...

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by airplay
Fri Aug 24, 2001 11:25 pm
Forum: Technical/Operations
Topic: B737 RMI Compass
Replies: 5
Views: 5812

RE: B737 RMI Compass

Hawk21M, You seem to be talking about the slaving circuitry. Slaved directional gyros use the short term stability of the gyro, along with the correction factor provided by the flux detector and the slaving circuit, to provide magnetic heading. the slaving circuit drives torque motors which slowly a...

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by airplay
Fri Aug 24, 2001 10:57 am
Forum: Technical/Operations
Topic: APU Questions
Replies: 10
Views: 4147

RE: APU Questions

This thread just proves how many different aircraft there are out there. (and opinions) Never assume that the APU system on the aircraft you're familiar is the only configuration out there. There are many different APUs in many different configurations. Like mentioned before, there are even some pis...

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by airplay
Thu Aug 23, 2001 11:13 pm
Forum: Technical/Operations
Topic: B737 RMI Compass
Replies: 5
Views: 5812

RE: B737 RMI Compass

In a perfect world, where both compass systems are perfectly calibrated, there would be absolutely no change in heading on any of the compass cards when this switch is slected to "Both on 1", "Normal", or "Both on 2". However, we don't live in a perfect world and we rarely encounter 2 compass system...

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by airplay
Thu Aug 23, 2001 10:37 pm
Forum: Technical/Operations
Topic: Lightning Divertor Strips.B737
Replies: 5
Views: 5283

RE: Lightning Divertor Strips.B737

Lighting diverter strips provide a path of relatively less resistance than the radome, to allow lightning strikes and severe static discharge to make it's way to the airframe where the charge can be dissipated to the atmosphere properly and slowly through the static discharge devices. (Static wicks ...

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by airplay
Thu Aug 23, 2001 4:18 am
Forum: Technical/Operations
Topic: Entretaiment System
Replies: 7
Views: 1251

RE: Entretaiment System

I've seen everything from movie projectors (with cellulose film) to DVD on aircraft. There are also VHS and 8 Millimetre Video and audio tape reproducers. I've also seen four track reel to reel is also used in some older aircraft. Cassette tape is found on many commuter turboprop equipment. I've see...

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by airplay
Mon Aug 20, 2001 11:19 pm
Forum: Technical/Operations
Topic: Is It Not Much Safer ....
Replies: 12
Views: 1901

RE: Is It Not Much Safer ....

Popee, Unfortunately, money DOES drive the design of aircraft. Many agencies including the FAA are involved in ongoing studies to define the cost of a life. According to them, life is not "priceless". They use this data in calculations to assess returns or cost savings of implementing safety systems...

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by airplay
Sun Aug 19, 2001 12:55 pm
Forum: Technical/Operations
Topic: DC-10 Instrument Panel Indicator?
Replies: 8
Views: 5054

RE: DC-10 Instrument Panel Indicator?

I'm not familiar with the DC-10 aircraft and I don't want to add to the confusion, but that display looks similar to the Honeywell AFCS advisory/annunciator display on DHC-8 aircraft. Here's a link to a picture with that panel: <br><center><a href="/open.file?id=172612" target="_blank"><font color="...

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by airplay
Thu Aug 16, 2001 1:29 am
Forum: Technical/Operations
Topic: Good Grief!
Replies: 17
Views: 1696

RE: If That WAS AN Airbus

Many so-called "Fly By Wire" aircraft use hydraulic power control units to operate flight controls. They are "electrically" controlled and "hydraulically" powered. The "wires" in FBW aircraft replace the control cables which would normally translate the flightcrew commands to the hydraulic power con...

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by airplay
Wed Aug 15, 2001 11:01 pm
Forum: Technical/Operations
Topic: Packs On/Packs Off
Replies: 14
Views: 2277

RE: Packs On/Packs Off

Just a clarification, Although the air conditioning packs control the mass flow of the air entering the aircraft interior, they do not control the pressure. The outflow valves control the pressure via commands from the pressurization controller. These 2 systems are related only in that the air condi...

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by airplay
Wed Aug 15, 2001 10:52 pm
Forum: Technical/Operations
Topic: Stopping An Airplane
Replies: 17
Views: 2017

RE: Stopping An Airplane

Notar520AC,

Depends on the Helicopter......

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by airplay
Tue Aug 14, 2001 11:24 pm
Forum: Technical/Operations
Topic: Is It Not Much Safer ....
Replies: 12
Views: 1901

RE: Is It Not Much Safer ....

The reason that flight attendant seats are often aft facing, is so that the little used aft face of the various bulkheads can be utilized without giving the passenger an undesirable aft facing seat. I've flown on many aircraft that have aft facing passenger seats including airliners. It's not a comm...

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by airplay
Tue Aug 14, 2001 6:59 am
Forum: Technical/Operations
Topic: Stopping An Airplane
Replies: 17
Views: 2017

RE: Stopping An Airplane

INSERT ADDITIONAL TECHNICAL INFORMATION HERE..................... This seemed like a good time to talk about the anti-skid system. In essense the anti-skid system available on large jets and turboprops bleed brake pressure off the system when the wheels are in danger of seizing due to over braking o...

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by airplay
Sat Aug 11, 2001 1:36 pm
Forum: Technical/Operations
Topic: Tcas / Acas
Replies: 13
Views: 4207

RE: Tcas / Acas

737LAME, When you say "In terms of an engineers perspective" do you mean an aeronautical engineer or a maintenance engineer? Please don't consider this request a challenge (as often happens). I just want to understand your perspective. I'd like to provide some clarification for your comments. In ter...

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by airplay
Fri Aug 10, 2001 12:22 pm
Forum: Technical/Operations
Topic: Flaps At Altitiude
Replies: 24
Views: 4266

RE: Flaps At Altitiude

Buff,

When you said:

"Gotta love that home-grown theory of flight."

Were you referring to my post? Just curious.

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by airplay
Thu Aug 09, 2001 3:33 am
Forum: Technical/Operations
Topic: Good Grief!
Replies: 17
Views: 1696

RE: No Grief!

Do you people really think that 5 incidents since 1977 is alot?????

With a safety record like that, I'd get on a 727 any time.

I understand that the original question points to the artillery shell incedent, and that does make you think!

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by airplay
Thu Aug 09, 2001 3:25 am
Forum: Technical/Operations
Topic: Tcas / Acas
Replies: 13
Views: 4207

RE: Tcas / Acas

The term ACAS was originally used by Eurocontrol which is the "European Organisation for the Safety of Air Navigation". The term stands for "Airborne Collision Avoidance Systems" as opposed to TCAS which stands for "Traffic Collision Avoidance System". The FAA chose to adopt the TCAS term in the beg...

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by airplay
Thu Aug 09, 2001 1:54 am
Forum: Technical/Operations
Topic: Flaps At Altitiude
Replies: 24
Views: 4266

RE: Flaps At Altitiude

I remember reading the incident report for that TWA 727. I certainly don't think the pilots were "heros" for operating the aircraft contrary to the AFM. I've witnessed this sort of damage on a Beech 200. The pilots liked to "crack a little flap" at high altitude (35K) to gain a little stability. You...

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by airplay
Mon Aug 06, 2001 2:00 am
Forum: Technical/Operations
Topic: What Makes Airplanes Fly?
Replies: 13
Views: 2269

RE: What Makes Airplanes Fly?

Everyone knows that paperwork makes airplanes fly.
 Smile

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by airplay
Thu Aug 02, 2001 11:29 am
Forum: Technical/Operations
Topic: Electrical System
Replies: 6
Views: 3153

RE: Electrical System

On small aircraft the battery is used to start the engine and typically an alternator (not a generator) will start to supply the DC electrical load including the recharging of the battery. The difference between an alternator and a generator is that the alternator produces alternating current (AC) w...

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by airplay
Tue Jul 31, 2001 11:11 pm
Forum: Technical/Operations
Topic: Manufacturng A Scanner.
Replies: 1
Views: 1179

RE: Manufacturng A Scanner.

Radio Shack used to make a frequency converter for your car. It connected between the antenna and the radio and allowed you to tune to aircraft VHF COM frequencies. The adapter had a dial on it for tuning. You would tune the FM receiver to a certain frequency and then adjust the dial on the adapter ...

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by airplay
Tue Jul 31, 2001 10:58 am
Forum: Technical/Operations
Topic: 121.5
Replies: 6
Views: 1658

RE: 121.5

I think most of what you'll here on those frequencies are people testing their ELTs. You'll have to be pretty close to and airport though. Some ELTs being installed these days also transmit on 403 MHz. They transmit serial data to a satellite including the last aircraft position from the FMS/GPS if ...

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by airplay
Fri Jul 27, 2001 1:37 am
Forum: Technical/Operations
Topic: Engineer's Vs Pilot's
Replies: 75
Views: 15221

RE: Engineer's Vs Pilot's

The word "engineer" is being taken out of context in this thread. An "Aircraft Maintenance Engineer" is not an "engineer". A "Flight Engineer" is not an "Engineer". A "Sanitation Engineer" is not an "Engineer". These titles are only valid if they are not taken out of the original context. If I walk ...

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by airplay
Tue Jul 24, 2001 12:33 pm
Forum: Technical/Operations
Topic: Engineer's Vs Pilot's
Replies: 75
Views: 15221

Engineers Vs Pilots

Here's another can of worms..... When you say "Engineer" do you mean the people who design the airplane or maintain the airplane? Is the term "engineer" appropriate? I was "heavily" involved in a discussion (arguement) on a Canadian Aviation forum on this point. I wonder what the general feeling of ...

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by airplay
Mon Jul 23, 2001 11:41 pm
Forum: Technical/Operations
Topic: FMS Approaches
Replies: 7
Views: 3168

RE: FMS Approaches

Buff,

I'm curious. What defines an FMS approach? What's the difference between an RNAV/GPS approach?

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by airplay
Mon Jul 23, 2001 11:36 am
Forum: Technical/Operations
Topic: FMS Approaches
Replies: 7
Views: 3168

RE: FMS Approaches

What do you mean exactly by "FMS approaches"? FMSs are used to conduct approaches all over the world. Many are capable of "NAV to NAV" style approaches where the unit transitions from RNAV enroute/terminal ops to an ILS. Some FMSs cannot do this though. Other FMS approaches are non precision type (V...

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by airplay
Mon Jul 23, 2001 11:29 am
Forum: Technical/Operations
Topic: Rnav And GPS
Replies: 5
Views: 2982

RE: Rnav And GPS

GPS is just another type of sensor used in Area Navigation. The term "Area Navigation" implies that the aircraft is guided on a track between 2 waypoints irrespective of the course to any particular navigation aid INSTEAD of navigating to a course as is done in "angular" navigation such as VOR. The ...

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by airplay
Thu Jul 05, 2001 11:53 am
Forum: Technical/Operations
Topic: Shouldn't All Aircraft Be Installed With This?
Replies: 6
Views: 2632

RE: Shouldn't All Aircraft Be Installed With This?

SAS, Your story is just that. A "story". The FAA doesn't actively sabotage the development of any foreign aircraft systems. They certainly wouldn't have made the statement you quoted. The FAA tries to use the best information possible when developing infrastructure and standards whether the informat...

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by airplay
Thu Jul 05, 2001 11:33 am
Forum: Technical/Operations
Topic: The Candair 600
Replies: 2
Views: 1272

RE: The Candair 600

I assume you're referring to the CL600-2B19 Regional Jet and not the CL600-2A11/2A12/2B16 Challenger?

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by airplay
Fri Jun 08, 2001 10:54 am
Forum: Civil Aviation
Topic: FARs
Replies: 9
Views: 1022

RE: FARs

Why doesn't anyone do the obvious and provide a link to the source of the FARs??? http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgFAR.nsf/MainFrame?OpenFrameSet You may be interested in FAR 25 which provides design standards for transport category aircraft. Subpart D has all the informat...

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by airplay
Mon Jun 04, 2001 12:57 pm
Forum: Technical/Operations
Topic: Are These Aircrafts Hydroplaning?
Replies: 20
Views: 4780

RE: Are These Aircrafts Hydroplaning?

Just out of curiosity AJ, do 747 operators normally operate the brakes at those speeds?

What is the typical maximum speed (if any) that brakes can be applied?

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by airplay
Mon Jun 04, 2001 4:12 am
Forum: Technical/Operations
Topic: Pix Of Lightning Strike Damage
Replies: 32
Views: 4650

RE: Pix Of Lightning Strike Damage

One more thing I just remembered.... Electrical discharge through static dischargers do not cause radio interference because they are designed with a large internal resistance of about 20 MegOhms which restricts the rate at which the charge is dissipated into the air. If a static discharger were mer...

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by airplay
Mon Jun 04, 2001 4:06 am
Forum: Technical/Operations
Topic: Pix Of Lightning Strike Damage
Replies: 32
Views: 4650

RE: Pix Of Lightning Strike Damage

Actually, the funtion of electrical bonding is for the purposes of static discharge as well as lightning. Years ago a Navion (a light twin that looks like a Cessna 310) was hit by lightning. The airplane crashed because all the control surface hinges were welded by the lightning. A fire in the nose ...

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