# All Questions

15,769 questions
205 views

### Constellation nosewheel angle

Why are the nosewheels on the Constellation canted in a few degrees ? Is it to ensure both tyres have ground contact during tight ground turns ? I've observed that on the A320 during tight turns that ...
373 views

### What causes airliner tyres to burst as often as they do?

Tyres burst - not just fail - remarkably often. The Aviation Herald lists 26 tyre-related incidents this year. I'd expect fast landings or overweight landings and heavy braking to be implicated, but ...
336 views

### Why don't solar powered aircraft use wings with more surface area

I was looking at some solar aviation projects, and I noticed they appear to follow the designs of a glider. The Helios drone above is basically a flying wing with a high aspect ratio. And the solar ...
56 views

### Pitching moment as a pure moment and its measurement with a homemade force balance

In mechanics, we learn that a force $F$ acting at a certain application point $P$ can exert a torque (also called moment of the force) about another arbitrary point $Q$ in the plane, i.e. \$\tau= F \...
149 views

### May an ultralight vehicle pass directly above KEGE at 9200 MSL at 1600Z with no prior authorization without violating FAR 103.17?

May an ultralight vehicle pass directly above KEGE at 9200 MSL at 1600Z with no prior authorization without violating FAR 103.17? http://vfrmap.com/?type=vfrc&lat=39.643&lon=-106.916&zoom=...
226 views

### Are ham radio contacts allowed from inside an airplane?

This question probably lies in the middle ground between Amateur Radio.SE and Aviation.SE. I have seen a couple of videos where ham radio contacts are made with people on board a commercial aircraft ...
446 views

### Is it legal to make emergency landing on roads?

Recently I've seen many videos of planes landing on car road. Is this legal? Does this only apply to only USA or even other countries?
73 views

### Why is True Altitude calculated using the difference from the QNH to 1013hPa?

I have an example for true altitude calculation. The given Information is QNH: 983hPa, cruise in FL 85, ISA -10°C in this Alt. The math and calculations are not hard and i also get to the correct ...
1k views

### How far would a landing Airbus A380 go until it stops with no brakes?

If an Airbus A380 lands with all brakes disbled, including reverse thrust, wheel brakes and any other measures it has to stop or slow down. Then how long would it take it to reach a complete stop.
288 views

### Why isn't a human required to confirm visually that flight controls are moving?

On this A380 flight after pushback and engine start and before taxi, Capt Juergen Raps and and Sr FO Harald Tschira rely solely on their FID to check flight controls. On a regular flight without ...
159 views

### Why isn't there some optional setting that can precisely move thrust levers jointly?

In the screenshots beneath (top, bottom), Capt Juergen Raps is fidgeting the A380's 4 thrust levers with his fingers to align them to the same thrust position. Isn't it unproductive for pilots to ...
2k views

### What is the reason for setting flaps 1 on the ground at high temperatures?

Yesterday I've seen an A320 standing at the gate with flaps 1. While this question answers, why the flaps should be up, is there any reason to retract the flaps to 1 instead of up? In addition it ...
101 views

### How can pilots sleep or rest 1 hour after takeoff?

The screenshot beneath hails from YouTube. The flight obviously commenced less than an hour ago, as the A380 just attained FL250. Then at 14:28 the relief captain (Robert Juelicher) leaves the ...
107 views

### Why was the An-225 built when the VM-T Atlant already did the job?

The Soviet Buran program decided to use a carrier aircraft to move their orbiter and Energia tanks similarly to the American Shuttle Carrier Aircraft. However, the Soviet Union built two types to do ...
32 views

### What is a jet engine tolerance for a bird strike? [duplicate]

Similar questions have been asked ; a partial answer is in 14 CFR part 33-76, stating 16 small birds ( 85 g) must be tolerated . But what other qualification tests are there ; for medium and large ...
4k views

### Could a person damage a jet airliner - from the outside - with their bare hands?

Given just a small hammer, I'm pretty sure I could disable a large airliner with a few well-placed blows. What about with my bare hands? In other words, are there any parts of a large aeroplane that ...
18 views

### As of June 2019, can a DPE in the United States renew a CFI's certificate based on completion of a FIRC?

Flight instructors need to renew their CFI certificates every 24 months. One of the ways to do that is by completing a FIRC. In the past, you had to take your completed FIRC to the local FSDO and have ...
56 views

### ASTERIX category 240 fields placement in a UDP packet

I searched the placement of ASTERIX Category 240 radar video data fields in a UDP packet. But I cannot find any useful info. Is there a standard for this work?
81 views

### Best Glide with Flaps T/O in DA20-A1

The Diamond Katana DA20-A1 Manual says that the best glide angle can be achieved with flaps in the t/o position at 72kn at maximum weight. My naive understanding would be that a flaps up position ...
59 views

### What are the Area Control Center (ACC) frequencies for Germany?

I'm looking for the frequencies of all Area Control Centers (ACC) in Germany. What are they, or where are they published?
99 views

### Why does setting the Legacy 600's transponder to standby mode also deactivate its TCAS?

In 2006, a 737 operating as Gol Transportes Aéreos Flight 1907 crashed following a collision with a Legacy 600 business jet; the Legacy's transponder proved to have been in standby mode1 at the time ...
28 views

### What is the best reliable weight/power ration achieved by a pre-1911 plane?

From the article "DAYTON BOYS EMULATE GREAT SANTOS-DUMONT" that appeared on December 18, 1903, it can be calculated that the apparatus, which took off one day before, flew 700 lb / 16 hp = 19.84 kg / ...
155 views

### Are passengers more likely to see other airliners from a window seat on the right or on the left?

From the window of an airline, one is more likely to see a plane travelling in the opposite direction, than one flying in the same direction. Are planes travelling in the opposite direction more ...
472 views

### Do ailerons on opposite wings move together?

It seems nicely symmetrical that opposite ailerons would be locked togther, so that when the left wing's ailerons move up, those on the right wing would move down, by the same amount and at the same ...
61 views

### Why does instability in pitch lower trim drag for an aircraft with a tail?

I have a hard time figuring out why a longitudinally unstable aircraft has a lower trim drag. This seems to be a thing especially in fighter aircraft, so does it have to do anything with supersonic ...
91 views

### Does aeronautical experience ever expire?

Do the hours of flying with instructor or solo ever expire? I have my 50 (yes, 50) year old pilot's Flight Log with CFI entries for 20 hours dual and 1 solo. Do I have to start over, or would some of ...
207 views

### What is the make and model of this plane?

I came across this picture taken in the late 1920s. Could you please help identify the make and model of this plane. Thanks.
86 views

### What type of license do you need to solo a glider in the UK?

What type of license do you need to solo a glider (cross-country) in the UK? Wikipedia states that: There is no government-issued licence at present, but EASA regulations will require one by 2015. ...
702 views

### Why is there always a fire truck present before refuelling?

Whenever I fly within Europe, I notice there is always a fire truck present for refuelling before takeoff. Is this standard procedure for every flight in commercial aviation? If yes, is this a global ...
83 views

### What is the difference between MEL and CDL?

I know the MEL and CDL are the minimum equipment list is provided by the manufacturer, if component missing or damaged means the aircraft must pass the MEL and CDL, I need some suggestions how it was ...
244 views

### Does the auto thrust at takeoff compensate for asymmetric engine characteristics?

When a percentage thrust has been determined for take off the auto thrust system (Airbus) or the auto throttle (Boeing) will send the data to the engines FADECs to provide the required thrust. When ...
49 views

### Where can I find a navigation database for Brisbane?

Does anyone know of a database that details the GPS locations of beacons within Brisbane; or a data-set that tells me air routes and associated en-route beacons, way points etc.? I'd like to be able ...
331 views

### Are there any safety hazards when testing the F-16's fire control radar on the ground?

What are the procedures for ground testing an aircraft's fire control radar - for the F-16 or any other aircraft - and are there safety hazards associated with exposures to humans? Most importantly, ...
3k views

### What is this airplane?

Found this old pic of an aircraft that used to service the north. Was wondering if anyone could identify, or had registration information. It would have been in service sometime between 1950-1970.
4k views

### Can the removal of a duty-free sales trolley result in a measurable reduction in emissions?

Recently, SAS announced that: Withdrawing tax-free sales will reduce the overall weight of the aircraft, which in turn will reduce fuel consumption and emissions. I could buy that this might be a ...
92 views

### When was the Speed Trim System implemented on the Boeing 737?

The Speed Trim System (STS) is a speed stability augmentation system designed to improve flight characteristics during operations with a low gross weight, aft center of gravity and high thrust when ...
198 views

### What are the effects of adding power to a 45 degree banked aircraft?

In a recent question it was proposed that adding excess power to an aircraft in a level 45 degree banked turn would cause it to pitch up into a rolling climb. This case was compared with level flight ...
54 views

### Are the pitching moment and pitching moment coefficient of an airfoil given w.r.t. the aerodynamic center?

When the magnitude and sign of the pitching moment and the value of the pitching moment coefficient are communicated, are these values given with respect to the aerodynamic center of the airfoil since ...
146 views

### QF72: How could a disconnected autopilot change the pitch?

So I was reading about flight QF72, where the A330 had incorrect sensor data. The aircraft automatically pitched the nose down twice in response to abnormally high incorrect angle of attack data, but ...
6k views

### What aircraft was used as Air Force One for the flight between Southampton and Shannon?

On Wednesday 5th June 2019, The US President flew from Southampton Airport, UK to Shannon Airport, Ireland on Air Force One. However, since SOU is more of a small regional airport, more used to ...
180 views

### Where can i find aircraft blueprints for study purpose? [closed]

I'm a 3D artist and i want to start my new project. I'm going to create an exact model of the Embraer 190 aircraft. I need this for my graduation project at the university (I chose such a project, ...
45 views

### Why do the flap maneuvering speed margins to stick shaker depend on altitude?

Why do the flap maneuvering margins to stick shaker reduce with increasing altitude? Ref: It is written in FCTM of the Boeing 737-800:
32 views

### Is there an FAA definition of what “normal flight operation” means?

Some documents talk about normal and abnormal operation. Is there a definition by FAA what normal operation is?
134 views

### Why does the thrust limit page display the thrust in percentage (« % ») and not in pound-force?

When the pilot sets the takeoff engines thrust on the Flight Management thrust limit page that displays on the CDU (or MCDU) interface, the selection will finally show as a percentage. The direct ...
2k views

### Why does the Antonov 225 needs 6 crew members?

Why does the Antonov 225 need 6 flight deck crew? What are they called and what do they do?
11k views

### Is it possible to fly backward if you have really strong headwind?

Is it possible to fly a plane backwards if you have a really really strong headwind? I mean when you are aloft, you have positive airspeed and airflow over the wings but you have negative ground speed....
166 views

### Which aircraft is this?

I was curious if someone could help me gather some more info on this aircraft. I have looked it up in the FAA.GOV site and it does not match. Is there a way to find out info on this plane that flew ...
47 views

### What failure modes did Airbus seek to eliminate or mitigate when they changed the design of the A310/A300-600's rudder travel limiter?

In the NTSB report on the crash of American Airlines Flight 587, it is mentioned (in the context of the changes between the A300-B2/B4's rudder system, on the one hand, and the A310/A300-600's rudder ...