# All Questions

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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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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?
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)?
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 ...
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?
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 ...
4answers
201 views

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 ...
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?
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?
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 ...
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 ...
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?
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
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 ...
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 ...
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-...
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 ...
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)? ...
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?
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 ...
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 ...
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-...
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 ...
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 ...
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 ...
1answer
83 views

### How many African countries currently deploy Cat 3 ILS?

How many countries in Africa currently operate Cat 3 ILS?
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. ...
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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