All Questions

8
votes
3answers
859 views

Where are the grounded 737 Max planes being kept?

With various countries grounding the 737 Max, where are they (their carriers) keeping the grounded planes? Are they simply being kept at Gates of various airports (which I doubt since gates are ...
0
votes
0answers
8 views

What exactly is the purpose of connection links straped between the rocket and the launch pad [migrated]

I am curious on what are those multiple connection cables latched between the rocket and launch pad. What exactly is the purpose of it, I am aware that one should be for filling up the fuel. But ...
1
vote
2answers
214 views

Amazon Atlas nose-down elevator deflection?

In this link I read about the crashed aircraft: The airplane then pitched nose down over the next 18 seconds to about 49° in response to nose-down elevator deflection. I feel that this is a common ...
2
votes
1answer
196 views

Could the autopilot have rectified the flight path without any crew input on the Aeroflot Flight 593?

In the case of the Aeroflot Flight 593 air crash, could the autopilot have rectified the flight path of the Airbus at any point if the crew had not attempted to correct the spin, even while partially ...
5
votes
1answer
253 views

On a modern Aircraft like the A320 or B737, is it possible to disable computer interference with the control inputs of the pilots?

One more question due to the recent and unfortunate events in the case of the second ever B737 Max 8 crash. As far as I know, the first of the two crashes was caused by the MCAS System, that ...
0
votes
0answers
255 views

Has it happened before the EASA and the FAA disagreed on the airworthiness of a plane?

With the Continued Airworthiness Notification and with the updated statement https://pbs.twimg.com/media/D1fZ4GTW0Ac4Qsr.jpg in contrast with EASA 2019-0051-E it is crystal clear the EASA and the ...
0
votes
0answers
30 views

What purpose of the thermal relief valve in PA-44?

In landing gear part, As I know, the valve will open to relieve pressure as a result of temp and pressure changes as airplane climbs or descends, but I do not know What purpose of the thermal relief ...
8
votes
1answer
526 views

How unusual is the 737 MAX 8's crash history?

The Boeing 737 MAX 8 is getting a lot of bad press at the moment, but people's instincts when it comes to probability are generally terrible, especially when it comes to risk assessment. Compared ...
0
votes
1answer
122 views

Why are expletives deleted in CVR transcripts?

I was reading this when I envisioned this question. In this age, I don't think expletives can offend anyone. They may not be germane, but oughtn`t authenticity outweigh relevance?
1
vote
1answer
203 views

Why wasn't the Boeing 737 grounded in 1991 after a crash's cause remained unknown? [closed]

Why weren't 737-200s (and other variants): grounded immediately after UA 585 crashed, out of precaution and risk avoidance? The crash's cause was unknown then. remained grounded in 1992, after the ...
2
votes
1answer
156 views

Why don't all pilots receive at least basic instrument training?

Given the frequency with which non-instrument-rated pilots get themselves killed attempting to continue VFR flights into instrument conditions, why don't all pilots receive at least basic instrument ...
2
votes
0answers
77 views

How was the navigation managed on jetliners before having programmable routes?

This in-flight photo provides a look into the pre-FMS era (also pre-INS), i.e., not having a programmable route. How was the navigation managed back then? (Question limited to 2-crew jetliners, or ...
1
vote
1answer
37 views

What is the most critical data to measure for a predictive maintenance model for a drone?

I'm looking at making a predictive maintenance model for a drone (quadcopter mainly but can include others) I'm wondering what is the most common causes of failure due to "overflying". (not including ...
19
votes
3answers
10k views

Why would a jet engine that runs at temps excess of 2000°C burn when it crashes?

Airline engines are designed to work at very high temperatures. Yet, when a plane crashes they're burnt (see below). Is it something in their design? (bostonherald.com)
4
votes
1answer
161 views

What are the pros and cons of practising figure-eight landings on perpendicular runways?

This is just a gee-whiz question, I have no intention of doing this nor am I trying to get anyone's blessing on this. Part of remaining current to legally take passengers up in a plane is having 3 ...
3
votes
1answer
238 views

What happens to an airborne plane when its type is grounded by an authority?

Many countries have (temporarily I think) banned 737 Max 8s from taking off or landing. What happened to the ones in the air? Do they get special permissions or are they forced to divert to a ...
1
vote
1answer
171 views

How does having a bigger engine placed slightly more forward and higher impact the plane in pitch?

I'm asking about general aerodynamics for under-wing twin-jets – I'm not after information/speculation on the Max 8 crashes/systems, but I mention the crash below because of what I see as an unclear (...
5
votes
1answer
3k views

Is the 737-800 a different plane from the 737 MAX 8?

I am flying on March 16 from Barbados to Toronto on a Westjet Boeing 737-800 also referred to as an aircraft type 73H on my ticket. Is this a different plane from the Boeing 737 MAX 8, grounded by ...
0
votes
0answers
81 views

Could a kilometer of sand as wide as the runway,1 meter deep stop an Airbus A380 if it overshot the runway [duplicate]

An aircraft overshooting the runway could prove to be fatal. Assuming an Airbus A380 is fully loaded at near take off speed and pilots decide its would be best to abort take off, if they slammed the ...
2
votes
2answers
166 views

Is it possible to 'derate' a plane as a safety measure?

Assuming a type of plane has a technical issue that must be fixed related to its flight behavior, could the plane be derated to add safety margin (instead of banning it). What I have in mind is ...
24
votes
2answers
7k views

If the Captain's screens are out, does he switch seats with the co-pilot?

If captain's screens are out, and let's say that the airplane is about to land and the captain is supposed to land it, will he/she switch the seats with the co-pilot? or does he/she depend on the ...
7
votes
1answer
119 views

What is scrub drag?

I've come across the term "scrub drag" in several papers recently, but can't find a detailed definition of this phenomenon. This is specifically in reference to aircraft and seems to apply to engine ...
1
vote
1answer
116 views

How energy efficient is an aircraft take off?

How much work is generally done by an aircraft (e.g. B737NG) in order to reach V_rotate, and how does this compare to the energy content of the fuel that is used?
0
votes
1answer
67 views

Getting data from Existing ADSB Receivers

Is there any way to get data from existing ADSB receivers installed around the world?
17
votes
1answer
5k views

Why is this plane circling around the Lucknow airport every day?

Saw this plane circling around Lucknow airport (LKO). This is happening every day. Any idea what is happening?
7
votes
1answer
4k views

How many AOA sensors does the 737 MAX have?

How many AOA sensors does the 737 MAX have? Given that it's reported in the media, that one faulty AOA probe activated the MCAS on the Lion Air flight, I was wondering if anybody also knows how an ...
0
votes
1answer
103 views

What flying boat has the highest maximum takeoff/landing sea state?

I assume that flying boats have limits on the sea states they’re certificated to take off and/or land in (for instance, hitting a ten-meter wave head-on in a five-meter wooden plane is probably ...
0
votes
1answer
38 views

What's the formula to calculate static air temperature?

What's the formula to calculate external temperature (static temperature) of an aircraft, given that I have Mach, TAS and altitude? Since I don't know the formula, I tried to search on Google. But I ...
0
votes
2answers
77 views

Pitot tube pressure question

I have this question is the pressure measured in the entry of the pitot tube the same when the plane is flying headwind or turning a 360 degree turn while maintaining the same indicated airspeed?
0
votes
0answers
16 views

Compute Thrust from RPM and Induced Velocity

I'm attempting to calculate the difference in thrust in a secondary propeller operating in the wake behind a primary propeller, in the context of a trailing quad-copter following a leading quad-copter ...
-1
votes
2answers
65 views

Are flaps a good idea for airfoils with a lot of camber?

I have a wing with an airfoil s1223 which is an airfoil with a lot of camber. the take off distance is limited so I want to implement flaps for this issue but I have the doubt if this is a good idea.
0
votes
1answer
72 views

Are there any non-bureaucratic hurdles preventing more widespread adoption of synthetic vision?

Occasionally, a flight will encounter bad enough weather that the crew will become disoriented. While tools like a terrain radar, ILS, and GPWS/TAWS do help the pilots regain orientation, they're not ...
0
votes
1answer
118 views

Did factors specifically related to the concorde design influence the Air france flight 4590 crash?

This youtube video partially attributes the retirement of all concorde fleets to the airfrance flight 4590 crash: Were the factors in this accident due to the ...
5
votes
2answers
190 views

Is autorotation possible in a tandem rotored helicopter?

I just wonder, whether a synchronized autorotation is possible in case of turbine failure (one or both gas turbine engines). All Gearboxes obviously must turn not to desynchronize -> lethal
7
votes
1answer
185 views

Is it common for automated control systems to use non-redundant sensors?

While reading an article about the Lion Air Crash with a Boing 737 Max 8, I was very surprised by the following paragraph: In designing the 737 Max, Boeing decided to feed M.C.A.S. with data from ...
15
votes
2answers
2k views

How to secure an aircraft at a transient parking space?

I've noticed that at many airports, the transient GA parking spaces often don't have tie-down anchors (e.g. bolts drilled into the pavement; heavy steel cables, etc.) or tie-down ropes. They simply ...
30
votes
3answers
8k views

Why would one plane in this picture not have gear down yet?

This image (as posted in another question) is a YouTube video's thumbnail: I noticed that the lead twin (737?) has gear down, the 747 behind does not (appear to) have gear down, but the third plane ...
1
vote
0answers
226 views

How much was the engine moved in the B737 Max w.r.t. older versions?

In the wake of the sad crash of ET-302, I am reading on multiple sources that the 737 Max's "engine is a bit further forward and a bit higher in relation to the wing, compared to the previous ...
3
votes
9answers
779 views

How many serious airline accidents have been caused by design faults alone?

That is, in the chain of events that led to death or injuries in an airline accident, how often has a design fault been solely responsible? By a design fault I mean a problem such that even if the ...
3
votes
2answers
207 views

Are any airlines actually flying the Comac ARJ21?

The Comac ARJ21, China's answer to Embraer's regional jets, was launched with great fanfare in 2016. However, if FlightRadar24 is to be believed, launch customer Chengdu Airlines does not appear to ...
5
votes
1answer
187 views

Are there any known instances of airline pilots passing off aerobatics as “turbulence”?

Inspired by this Far Side cartoon, which shows the pilots of (presumably) a passenger airliner rolling the plane steeply from side to side, and claiming (to the passengers) that they’re just passing ...
0
votes
2answers
70 views

How can I estimate pressure altitude?

How do I find pressure altitude? Find pressure altitude using rule of thumb for 1498 feet when the altimeter setting is 27.83" Hg. I did (29.92-27.83)*1000+1498=3588 Did I do this correctly?
3
votes
3answers
63 views

Load factor and how does velocity affect it?

An aircraft initially flying level with a velocity of 130 m/s pulls into: a turn of radius 300m at constant altitude (i.e. a horizontal circle) with constant velocity; a loop (i.e. a ...
0
votes
1answer
164 views

Is it possible to get permission to fly a quadcopter around the St. Louis Arch for non-professional means

Is it permissible to fly a small quadcopter (<1 kg) around St Louis Arch for non-commercial means? If so what permit/permission is required?
13
votes
3answers
2k views

Which situations would cause a company to ground or recall a aircraft series?

Which agencies or companies might decide to ground an aircraft series, and in which situations can this occurr?
1
vote
1answer
52 views

Carburetor Heat Required on Carburetor equipped GA aircraft?

Is Carburetor Heat Required (by FAA Certification regulations) on Carburetor equipped GA aircraft? If not, what (if any) certified carburetor-equipped GA aircraft do NOT have Carburetor Heat installed ...
1
vote
2answers
100 views

Carb Heat and Lycoming Engines

Why is Carb Heat less of an issue on Lycoming Engines? and if this is true, how much less of an issue is it?
1
vote
1answer
100 views

What maintenance actions are required after a bird strike?

Does the SRM or AMM detail what Inspections to do following a bird strike? Do the engineers have to examine the bird remains too and report it to someone?
2
votes
1answer
255 views

How fast do the F-35 weapons bay doors open/close during combat ops?

(YouTube) I came across the following Norwegian F-35 video launching a live missile from its right bay door. Of course, opening the door and launching the missile drastically increases RCS, but it ...
3
votes
0answers
115 views

Is there a name for aircraft weapon load photos?

I remember as a kid I had a couple of books full of spec sheets and big glossy photos of military planes with every standard piece of weaponry laid out in front of them, something like this (c/o Tech ...

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