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3
votes
0answers
53 views

Did these parts come from a T-33 crash?

A Lockheed T-33 crashed near my hometown (Outer Cove, Newfoundland) in 1956. This year we have had some very strong storm surges, and a piece of metal has washed up on the shore. I am posting this ...
1
vote
0answers
48 views

Are the A320's A and B electrical buses both energized all of the time during flight?

I'm a novice reading a quick study guide. For electric power, I notice that the A320 has two buses: A and B. Are they both energized all of the time during flight? If not, is there a way to switch ...
6
votes
2answers
121 views

What is the German / European equivalent of FAA Order 7110.65?

FAA Order 7110.65 prescribes air traffic control procedures and phraseology for use by personnel providing ATC services in the USA. Which documents regulate these aspects in Germany, or, more ...
40
votes
9answers
7k views

Why was the boat mounted this way on the underside of the wing on the “Landseaire” flying yacht?

After seeing the below image of the "Landseaire" flying yacht here I was curious to know why the small boat mounted to the underside of the plane was mounted the way it was. At least to me (and @Dave ...
18
votes
3answers
17k views

Do helicopter rotor tips regularly go supersonic?

In my question about helicopter noise, I made the assumption that one reason they are so darn noisy is that the main rotor tips go faster than the speed of sound. @FreeMan questioned whether that was ...
1
vote
0answers
19 views

Are the PW1100G and PW1400G engine series not certified by the FAA?

I was digging around the FAA type certificate data sheet (TCDS) database and I could not find the entries for the PW1100G and PW1400G engines series. I then went to the EASA TCDS database and both of ...
0
votes
0answers
66 views

What are the load factor limits of an aerobatic aircraft with a wing walker?

Wing walking seems to be performed with aerobatic planes since wing walkers making figure while the aircraft is in a looping is not uncommon, as seen in this video on the youtube FAI Air Sports ...
11
votes
2answers
672 views

What sort of debris has been found in 737 Max fuel tanks?

There have been numerous reports of Boeing finding "foreign object debris" in the fuel tanks of its 737 Max airliners. It's not clear what this debris is. It could range from a couple of missing ...
0
votes
3answers
187 views

How many fastener can an aircraft lose?

I see this GIF animation a few times then I wonder how many fastener can an aircraft lose before it becomes dangerous. I’m sure losing one wouldn’t be an issue due to safety margin built into every ...
2
votes
0answers
50 views

Why small private jets are sold just after few years?

Why So many private small jets are sold within few years. Hardly a year or two, with depreciation of over 1 - 2 Mil? I understand, these are bought by millionaires. But Everyone spends some time ...
-1
votes
0answers
31 views

is it legal to display user seat info on a public platform with absolute user consent [closed]

Planning a public platform to display user seating info after taking proper user consent , will that still attract legalities if user is ok with it , will it fall under any legal clauses under GDPR ...
1
vote
1answer
50 views

Is ADS-B required for flight under class B airspace but outside the Mode C veil?

In the U.S., can a non-ADS-B equipped aircraft legally fly under class-B airspace extensions that are outside of the 30nm Mode-C Veil circle?
0
votes
1answer
158 views

What does pre/post modification mean in Airbus MPD?

What is the difference between POST MOD (with partial mod i.e SXXXX) and PRE MOD (with partial mod) in the applicability column of an Airbus MPD (Maintenance Planning Document)?
2
votes
1answer
81 views

What are the CONT and FLT modes of the 737 start switches?

I pilot the PMDG 737 in my simulator and I know that before takeoff and before landing, the start switches must be set to CONT mode and at high altitudes in FLT mode. But what exactly are CONT and FLT ...
20
votes
8answers
13k views

What is the difference between turbojet and turbofan engines?

What is the difference between a turbojet engine and a turbofan engine? I know that both of them have a fan and have turbines but how to distinguish them?
4
votes
1answer
82 views

Starting engines during push-back

Is it allowed, considered safe, and done, to start the engines while the aircraft is moving under the push-back power? On one hand it seems like a big time saving, on the other hand the running ...
4
votes
4answers
201 views

Can you fly 2000 miles on an engine that costs less than $500k? If so, what type of engine?

Ok so Im exploring ways to bring cargo and medical supplies to various rural cities in say Africa without relying on ground infrastructure. Just short and cheap runways spread around the continent. It ...
47
votes
3answers
73k views

Why did the Ju-87 Stuka have a siren?

Why did the Ju-87 Stuka have a siren? Was this for purely psychological reasons or did it help the pilot in some way?
11
votes
4answers
6k views

Why was the engine of the Ju-87 Stuka not replaced with a more powerful one?

Related to this question Why did the Ju-87 Stuka have a siren? I would like to know the reasons why they have not changed the engine of the Stuka when they realised it was easy prey for Hurricanes ...
11
votes
2answers
1k views

Did the Stuka Ju-87 really have a radio altimeter? If so, when?

This is what Wikipedia says near the end of its radio altimeter article: The radio altimeter first showed up in the German Junkers Ju-87 "Stuka" dive bomber which was equipped with one for ...
15
votes
7answers
2k views

How would you explain Bernoulli to a nine year old?

This is a aviation principles question coming from my nine year old daughter that I need help with. I was explaining to her the principle of flight and the fact that you need airflow under the wing in ...
8
votes
4answers
3k views

RATO used to get civilian aircraft out of airports with inadequate runway length?

There are plenty of stories of large aircraft accidentally, or emergently, landing at airports that don't meet the plane's runway length requirements. The only solution to getting them out that I've ...
1
vote
2answers
65 views

At which angle tiltrotor's rotors generates more lift?

[Tiltrotor 1] [Tiltrotor 2] I can't name these tiltrotors. I just want to know which of the tiltrotors generate more lift considering aerodynamics and based upon the rotors ...
7
votes
3answers
2k views

How is a turbine engine rotated for starting and inspections?

I'm doing an assignment for my Level 3 Aeronautical Engineering course and stumbled on this question and I can't seem to answer it (we have had no teacher for 4 months and therefore we have to learn ...
76
votes
4answers
26k views

How did the 9/11 hijackers find their way to New York City?

It is quite well known that the airplane hijackers on 9/11 were not professional pilots. So, my question is how some people who didn't have any experience of navigating the airplanes could find their ...
20
votes
2answers
9k views

Where is the generator in a large turbofan of a commercial airliner?

So, where do you put the electrical generator? If it's gonna be coaxial, the only place is the rear (it will be burnt) or the front (it will get in the way of intake). If it's gonna be coupled to a ...
1
vote
0answers
54 views

Carpet Plots for Aircraft Sizing

Generally, Carpet Plots are constructed to find out an optimal design which will satisfy all the performance needs and is least in weight & cost. I want to know how to construct a carpet plot? I ...
1
vote
2answers
69 views

How close is the air resistance or drag force to be proportional to the speed squared?

How is the total air resistance force exerted upon a body (aircraft or car) related to its speed relative to air at far away? A simple Newton's force momentum analysis suggests that the force $F \...
12
votes
5answers
3k views

Where is the 'zone of reversed commands…'?

There seems to be some confusion about where the 'zone of reversed commands' really is, i.e. where a decrease of airspeed results in an increase of drag. Some references place that zone to the left ...
0
votes
1answer
162 views

What is the definition of “blade scatter” in gas turbine compressor dynamic balancing?

Can someone help me define “blade scatter” gas turbine compressor dynamic balancing?
8
votes
2answers
323 views

What is the type of the seaplane at the end of runway 18L on Schiphol Airport?

From 47 to 52 seconds into this video we can see a seaplane parked in a small pool of water. What type of plane is this and when did the plane fly for the last time?
2
votes
1answer
34 views

What's the relation between TAS and Mach in tropopause?

I understand that TAS decreases with altitude with constant Mach number in troposphere, however I'm not sure what happens in tropospause, as the temperature is constant, however the density is still ...
1
vote
0answers
43 views

Can transition on an airfoil occur without prior separation?

i.e. can transition occur without the presence of a laminar separation bubble? If yes, what would this look like in a pressure distribution? Here, a clear laminar separation bubble can be seen. The ...
0
votes
0answers
20 views

A320 IR2 MEL OPS Procedure

The A320 34-10-05B IR2 MEL OPS procedure additionally calls for Air Data switching to FO3. When ADR 2 is working fine why replace its data on the FO PFD when only IR data is lost?
24
votes
8answers
22k views

What is the purpose of having contra-rotating props on an aircraft?

Why do planes, like the famous XF-11 and the Tu-95, have contra-rotating props? What is their purpose? Image credit: Mike Freer / Touchdown-Aviation / Wikimedia
5
votes
1answer
206 views

What are these “portholes & panels” on the fuselage of the Omega Tanker DC-10?

If you take a look at the photo (source: still from this YouTube video), you'll notice a pair of "panels" on the fuselage of this Omega Tanker DC-10 (reg: N974VV), circled with green. There is also ...
4
votes
1answer
157 views

How does a DC-10 flight engineer manually raise the cabin altitude?

Reading into Federal Express Flight 1406 and I noticed when the flight engineer said he was raising the cabin altitude “manually” I assume this has something to do with cutting off the oxygen, but how ...
4
votes
0answers
93 views

Why don't NK-12 powered contra-rotating propellers turn in equal rpm?

The Kuznetsov NK-12 is a Soviet turboprop engine of the 1950s, designed by the Kuznetsov design bureau. The NK-12 drives two large four-bladed contra-rotating propellers, 5.6 m (18 ft) diameter (NK-...
4
votes
4answers
4k views

Are there disadvantages of coaxial rotor on attack helicopters?

My question stems from the fact that, although this is a very fierce looking, and formidable aircraft with a very powerful engine, Ka-52 Alligator has not seen many export success. Its export is very ...
6
votes
5answers
462 views

Do contra-rotating propellers have the same RPM?

Image source Here is a contra-rotating propeller. The front propeller rotates counterclockwise while the back propeller rotates clockwise. My questions are: Do they rotate at the same speed (RPM)? ...
1
vote
1answer
352 views

Is there a list of airports with Category 3 ILS systems?

Is there a list of airports with category 3 Instrument Landing Systems?
-1
votes
1answer
68 views

How did the pilots of Alaska Airlines Flight 261 stall when they were in a lot dive? [duplicate]

At 16:09:31 one of the pilots said “you’re stalled” This photo says the initial dive started at 16:09:20, 11 seconds before the pilot said “you’re stalled” This brings me to my question: How do ...
15
votes
5answers
3k views

Can a private jet take off without notifying anybody and land on private land?

If you have friend in the USA that owns a lot of land that is suitable for landing a plane, and you own a private jet with 2 pilots in Norway, can you takeoff in private property without notifying ...
3
votes
1answer
118 views

Is ADS-B anonymous mode deterministic?

From what I can tell, this is the method of creating a temporary ICAO address in the 978Mhz UAT protocol: From https://www.icao.int/safety/acp/Inactive%20working%20groups%20library/ACP-WG-C-UAT-2/UAT-...
13
votes
3answers
2k views

Did people really hand-start big bombers in WWII?

I am not a pilot so I don't know anything about hand starting propeller aircraft. But I wonder how easily can the propeller fire up unexpectedly during the procedure even if it's done right. Whenever ...
7
votes
0answers
66 views

Are there any examples of sustained human-powered flight above ground effect?

Every video of human-powered flight has the plane or helicopter so close to the ground that it benefits from ground-effect. Is there any exception to this rule, i.e. a still-air-level-ground human ...
0
votes
0answers
36 views

How is the 747-100's ground-handling bus protected against being energised by the engine-driven generators in the event of a bus-to-bus short?

The NTSB report on the non-crash of UA811 includes a detailed description of the operation of the 747-100's lower-lobe cargo door and the associated electrical circuitry, as well as an explanation for ...
3
votes
1answer
83 views

How many African countries currently deploy Cat 3 ILS?

How many countries in Africa currently operate Cat 3 ILS?
2
votes
2answers
117 views

Elliptical wing planform and elliptical lift distribution

I know that there are similar topics already here, but after reading them I still do not understand everything. From what I know elliptical lift distribution gives the least amount of induced drag. ...
5
votes
3answers
185 views

Can Flex thrust be lower than climb thrust?

Let's restrict this question to airliners with 2 jet engines. For the remaining of the question, I'll use the term flex to designate reduced take off thrust as I'm more familiar with airbus's systems....

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