# All Questions

14,556 questions
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### Under EASA regs who is responsible for part m continued airworthiness? Lessor or Lessee?

If an aircraft is leased out by a lessor to an operator does the lessee (operator) take full responsibility of continued airworthiness or does the lessor have some liability? Perhaps it's similar ...
47 views

### Why are the engines on the MAX and neo prone to bowing?

The engines of the 737 MAX$^1$ and Airbus A320neo family$^2$ are [more] prone to bowing (shafts deforming if no debow is applied during start – as I understand it, this happens in a turnaround while ...
33 views

### What does the orange colored text in a SkyVector route indicate?

If you use a pre-made route in skyvector.com, sometimes there will be orange text. For example: from KIAD to KTPA with default cruise settings, the second route in the list will have DADES6 in orange....
16 views

### UAV development platform

What is UAV development platform? For example, STM UAV, Intel, Parrot and so on. I searched on Google, but couldn't get its exact meaning. Thank you very much.
45 views

### Could Falcon 9 fairing become glidable / flyable?

Reading and thinking about this and this questions on space exploration stackexchange, I was wondering if the fairing could shape itself, so that it becomes one stable and steerable gliding element ...
30 views

### BR61 Taipeh -> Bangkok -> Vienna. Why the deboarding in Bangkok?

I recently flew from Taipei (TPE) to Vienna (VIE) via Bangkok (BKK), with EVA Air BR61. In Bangkok, all passengers had to deboard, and then go through security again and board again, for a ~1 hour ...
97 views

### Why would a cylinder not work below a certain RPM?

We have an IO 540 Lycoming engine, and cylinder #3 doesn't work below 1900 RPM (cold to the touch; EGT and CHT are zero; no vibration). The engine is new, what could be the cause(s)? We cannot ...
26 views

### Proportionally, what is more affected by a hot and high takeoff - a electrically driven propeller or a turbofan?

My assumption would be the electrically driven propeller would be less affected compared to turbofans at high altitudes and take off as although the air would be less dense at these ambient conditions,...
21 views

### How many flights can be made under EASA permit to fly?

I understand the permit to fly is valid for 14 days, but how many flights can be made in that time?
39 views

### Is the time spent flying in a Sailplane concidered a valid flight hour for a LAPL / PPL license?

I live in the Netherlands. In order to get a Light aircraft pilot licence (LAPL) license 30 flight hours are demanded, A private pilot licence (PPL) requires to have 45 flight hours. flying in a ...
174 views

### How can a Cessna cut the wing of a Boeing?

I read days before about the collision of the flight PSA Flight 182 on September 25, 1978. I was wondering how is it possible that a Cessna 172 can CUT Boeing's 727-214 wing. There is a video with the ...
72 views

### When cruising, is any moment that a pilot will reduce his/her airplane speed?

Say, a pilot is piloting his/her jet commercial airplane and suddenly see cumolonimbus or a dark cloud. Then, should the pilot reduce his/her airplane's speed to avoid turbulence?
112 views

### Why does Thai Lion Air use loads of 737 ERs for 1-2hr routes?

Thai Lion Air primarily flies short-haul domestic routes and most of the time I find myself on an ER version of a relatively new 737. Isn't ER for extended range? And thus costs a lot more per plane? ...
45 views

### what is the earth resistance to be maintained while aircraft is on ground and during ground checks for military aircrafts

While aircrafts are under servicing on ground, the external dedicated earth wires are connected to the aircraft to avoid static hares effect to human beings. How much resistance value has to be ...
109 views

### What is this airplane?

I came across this print at a bargain store a couple weeks ago. At first I thought it might be a variant of a Lockheed L-188 Electra; then I noticed that it has at least 6 engines, as the print ...
2k views

### How does a single engine tail wheel landing gear airplane turn when it is on the ground?

Say Cessna 140 as in this video, look like no additional device to make it turnable when it on the ground. It is a single engine and a tail wheel landing gear. Then, how does it turn?
58 views

### Marshall signals history

When airport marhall signals have been used for the first time? Wich is the history about these signals? Thank you
3k views

### What is the small cylinder on the firewall to the left of the battery?

What is this and should the yellow wire be soldered to it? Any ideas on preventing the wire from detaching again? I checked the C150 parts manual but didn't see it. Is there somewhere else I should ...
57 views

### What is the purpose of the hold at JNC on the Grand Junction Seven SID?

There is a hold on the Grand Junction Seven SID. I would expect it is there so that ATC could hold you until you reach the enroute MEA but there is no written reference. So, what is the reason ...
66 views

### Please explain differences between AFM and FCOM manuals?

What are the key differences between AFM and FCOM and where they will be used?
107 views

### Why Engine Exhaust Nozzle can not be totally buried in aircraft fuselage? [on hold]

Why The CD nozzles of the fighter aircraft are always outside the fuselage, Why the whole engine is not buried in the fuselage?? If engine shroud also can be made variable area and varies with CD ...
118 views

### How can a Software Engineer interact with the creation of an airplane? [on hold]

I am a Software Engineer in the sector of Automation Testing (on the web and on system testing too). I am trying to focus mainly on aerospace systems and technologies. What I do not really know, is ...
55 views

### Which one is more effective produce power of this two turbine's location?

Consider we have the exactly same turbine which is possible to be mounted to the tail (left picture) and to the wing (right picture) as picture below. Which one will produce more power to the airplane?...
161 views

### Why was the DC-8-70 successful, but not the 707-700?

The first high-bypass turbofan small enough to use on a narrowbody jetliner was the GE/SNECMA CFM56, which entered service in the late 1970s as an upgrade engine for the KC-135 tanker; Boeing almost ...
114 views

### Which international routes might save fuel and time by using a potential newly “deemed safe” North Korean air space?

The Reuters News item Exclusive: U.S. blocks North Korean air traffic revival ahead of Trump-Kim summit - sources says: If the space was deemed safe, international airlines could save fuel and time ...
60 views

### Can a private pilot placard an inoperative instrument?

For certificated small aircraft that are not required to have a minimum equipment list. If you have an instrument break while on a cross country flight and it is not a legally required instrument for ...
42 views

### Aircraft engine model [on hold]

For an axial compressor working in steady state condition, what would be the pressure impulse response? Ideally, I'm looking for an equation obtained using the Laplace transformation. Can someone help ...
88 views

### Why is carburetor heat unnecessary at full throttle?

Questions like How does aircraft design affect carburetor ice? show how carburetor mount point affects the relative passive heating of the carburetor by the engine, but I've never learned why full ...
165 views

### What is this aircraft from ca. 1925 (crash included)?

I recently found the following family pictures from ca. 1925 and have been trying to identify the aircraft in them: A second picture of the same aircraft was taken shortly after the first one: Both ...
14 views

### What is the difference between EASA PART 21 Subpart j & g?

I understand that part 21 subpart j is design organisation approval and part 21 subpart g is production organisation approval but can someone explain the main differences and what their relationship ...
108 views

### I want to be an airline pilot. Would becoming a NON-COMBAT Air Force pilot be a good way to become one? [duplicate]

I know that becoming a fighter pilot is highly competitive, making it a difficult route, but would becoming a pilot for an Air Force cargo aircraft or something of the like be a good way to reach my ...
33 views

### Can someone explain the EASA approval process to fly ETOPS?

First of all does the TC holder (manufacturer) of a new aircraft have to gain approval to state that the aircraft is capable of flying etops to a certain level..? I.e ETOPS 120. Secondly does the ...
76 views

### Do any Waco aircraft have model names?

Many aircraft manufacturers give names to the aircraft models. Piper had the Cub, Super Cub, and all the Comanche/Cherokee/Navajo/etc. names used in branding. Cessna has the Skyhawk, Skylane, etc. ...
1k views

### Where do standard torque values in maintenance manuals come from? [on hold]

Maintenance manuals of today's civil aviation aircraft (from both Boeing (e.g., B-737) and Airbus (e.g., A320)) have special chapter to describe "standard torque value" for fasteners and connections. ...
1k views

### Why do airlines seem to go out of business suddenly? [on hold]

FlyBMI are currently in the news for failing and stranding passengers abroad. This is not the first time an airline has halted operations seemingly overnight and left passengers without a way to get ...
55 views

### In turbojet engines, does the fan play a key role in the air intake to the inlet? [on hold]

In turbojet engines, does the fan play a key role in the air intake to the inlet?
111 views

### What is this aviation quote?

I remember hearing a quote about aviation that was something along the lines of “asking a pilot why he loves flight is like asking an artist (or a painter?).....”. For the life of me, I cannot ...
61 views

### Is it possible to communicate an everyday computer with the ARINC bus? [on hold]

Lately I've been wondering if it's possible to interface an everyday computer with the ARINC buses (either 429 or AFDX). This would be very useful for simulation, testing and prototyping purposes. ...
50 views

### Who is responsible for re-declaring the runway? [on hold]

I'm developing a system which recalculates how much of the runway can be used for safe landing and take-off. If there's an obstacle on the runway (another aircraft, surface damage), then who would use ...
66 views

### Why does the FMC in B737 limit the climb speed to 230 knots on the VNAV mode until the leading edge devices are fully retracted?

In the VNAN climb on B737, the FMC changes the target speed from V2+20kt at liftoff, to 230kt for acceleration at the preset accleration height, then to 250kt (below 10,000ft) as the leading edge ...
37 views

### Is there any companies, programs, or places that offer financial assistance for flight school for those with very bad credit? [on hold]

I am looking into options for flight training. I have already begun my training for my private, but due to a family emergency i had to stop for a few years. Now I am looking to get back into flight ...
69 views

### Does heavy air pollution improve takeoff performance?

As you all probably know by now, aircraft have much better takeoff performance when and where the air is denser; this is why flights need to either use longer runways or jettison passengers and cargo ...
49 views

### How do barometric altimetry systems compensate for nonstandard pressure lapse rates?

Barometric altimetry relies on atmospheric pressure dropping at a steady rate with altitude, starting from a measured ground-level pressure. This, in turn, relies on atmospheric density dropping at a ...
168 views

### Is it possible to convert a passenger A380 to carry cargo?

I heard an expert say that one of the A380's weaknesses is that it only comes in a passenger version, not a cargo one like the B747 does. The cargo version of the B747 makes its market wider. One more ...
106 views
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### Can pilots tell if a cloud or fog is made out of water droplets or ice crystals when flying through it?

I understand that clouds can be made out of water droplets or ice crystals. And that fog is nothing else than low-lying clouds. However, I've experienced fog in a wide ranges of temperatures. I like ...
80 views

### How fast can pushback tugs actually go? (maximum possible speed)

For school, I'm doing a project where we choose a topic about anything, ask questions, and learn about it. I chose my topic as fuel efficiency of airplanes, and one of the things I want to research as ...
377 views

### Why would one want to slow to V2 following an engine failure during takeoff?

Reading about the crash of American Airlines Flight 191, the proximate cause of the final loss of control was the pilots' reduction of the aircraft's airspeed to V2, in compliance with the published ...
41 views

### Can I execute an ILS approach using a NAV CDI with LOC signal only?

I have been flying a small Cessna airplane that has a COM/NAV NARCO MK12 equipment with CDI (lateral needle only). This CDI does not incorporate a horizontal needle to provide vertical guidance, so ...