All Questions

1
vote
0answers
10 views

What's is the range for common fly-by-wire controls to allow control inputs in?

What's the range that typical fly-by-wire controls (let's take A320 and B777 as examples) allow inputs in? The A320 controls in the y-axis of the side stick (forward/backward axis) the g load - what'...
0
votes
1answer
50 views

Would knowing the exact weight that has been loaded on a commercial plane and it's distribution be useful?

There's been a bit in the media about weighing passengers in order to get more accurate take off weights for commercial planes. I'm guessing the delta between a heavy set of passengers and a light ...
-1
votes
1answer
35 views

What rotor setup on a helicopter is the best for auto rotation?

Which helicopters auto rotates the best or what rotor set up is the best? Could the rotors be modified to perform better at auto rotating and maybe less at powered performance?
6
votes
2answers
1k views

What helicopter has the most rotor blades?

I have seen 2 rotor blades up to many and wonder when does having more rotor blades become less efficient? What helicopter has the most rotor blades? Related: Why don't helicopters prefer shorter ...
4
votes
2answers
998 views

Can stored/leased 737s be used to substitute for grounded MAXs?

The 737 MAX was introduced relatively recently. I would have assumed they were replacing at least some older 737 models in operation with the major airlines that took them (eg Southwest, American, ...
1
vote
2answers
46 views

Bell Lift distribution [on hold]

Why has he bell distribution not become widely used? Is the bell distribution only ideal in inviscid flow scenarios or is there another reason for the lack of use?
3
votes
1answer
68 views

What was the speed limitations for droop nose on the Concorde?

Lowering gears or extending flaps comes with limitations. Given the answer of this question I suppose the limit speed for full nose down is about 325 kt. My question is: what were the limit for all ...
0
votes
2answers
52 views

What is the THS deflection speed?

Let's restrict this question to best sellers airliners (A320 and B737). On this aircrafts, the THS is used for pitch trim. The speed requirements may not be has intense as for elevator as it control ...
0
votes
1answer
56 views

What DAL level is IFE software certified at?

An inflight entertainment (IFE) system has software for the computers and for the seatback displays. What DAL level is the software classified at?
1
vote
0answers
32 views

Why does the Hinch Mountain VOR (as an example) have void areas under certain altitudes published in the AF/D?

I was digging around the SE region AF/D, and I was reading KSRB (Sparta, TN), and this "VOR unusable" listing is contained in it: The sectional chart shows that it is nearly on top of a hill. I've ...
1
vote
1answer
153 views

What were the Concorde's emergency procedures for an uncommanded droop-nose extension in flight?

The Concorde had a droop nose, which swung down during taxi, takeoff, and (especially) landing, so that the pilots could see where they were going without the long nose getting in the way. During ...
0
votes
0answers
55 views

Can you tell me how I can describe the flow over this flat plate? [on hold]

In the image, you can see the flow over a flat plate. The flow is going from right to left. I would like to know what is shown in the picture (i.e. shock wave, separation on the flow...). Just need to ...
7
votes
4answers
2k views

Why not use the yoke to control yaw, as well as pitch and roll?

(Inspired by this question about rudder hand control on joystick-equipped aircraft.) Most civilian fixed-wing aircraft (post-1987 Airbus airliners being the primary exceptions) use a yoke (...
-3
votes
0answers
30 views

About advantages of Mahoney filter over kalman filter in Euler angels estimation( yaw,pitch,roll) [on hold]

What are the advantage of mahony filter over kalman filter in ruler angel( yaw,pitch,roll) estimation?
0
votes
0answers
15 views

Drag Coefficient of a rounded nose cylinders [on hold]

According to this pages: http://www.aerospaceweb.org/question/aerodynamics/q0231.shtml The drag coefficient of a rounded cylindrical bodies is given by this graph :http://www.aerospaceweb.org/...
3
votes
1answer
119 views

Could the Olympus 593 have been windmill-restarted during supersonic flight?

The Rolls-Royce/SNECMA Olympus 593 (which powered the Concorde) used a complex intake-ramp system to improve the engine's efficiency and prevent an engine shutdown or failure during supersonic flight ...
2
votes
1answer
100 views

Is there any recorded instance of a passenger's hat or scarf being blown into an aircraft's engine?

Passengers climbing the stairs into an airliner are often subject to gusts of wind; I've had to hold onto my own scarf in the past. It doesn't seem beyond the bounds of probability that a passenger'...
2
votes
2answers
2k views

Why complex landing gears are used instead of simple, reliable and light weight muscle wire or shape memory alloys?

Muscle wires actuators are really simple, have a high power density and are reliable. Landing gears on other hand are used only twice per flight while taking off and landing (if everything goes well ...
-2
votes
0answers
42 views

Are any commercial airliners other than the Boeing 737 MAX dynamically unstable? [duplicate]

There are many reports online that the 737 MAX is dynamically unstable. Is this unprecedented in modern commercial aviation? References: https://spectrum.ieee.org/aerospace/aviation/how-the-boeing-...
0
votes
1answer
27 views

High altitude turbine efficiency question [on hold]

The simple reason turbine engines are more efficient at high altitudes is because as the air becomes less dense it requires less fuel as the ratio has to remain constant. This holds true up to ...
5
votes
3answers
911 views

Nose gear failure in single prop aircraft: belly landing or nose landing?

Let's say we are flying a single prop airplane with tricycle format retractable gear, such as a Mooney Bravo or a Piper Comache. The nose gear fails mid-flight and is unable to be lowered. Is it safer ...
0
votes
1answer
46 views

How to disable GPWS in a 737NG just like how the Airbus can?

The Airbus planes have a feature where the GPWS can be disabled. But I cannot find any switch in the 737NG cockpit to disable the GPWS.
4
votes
2answers
78 views

How (and when) does Heathrow alternate arrival paths?

I've noticed that flights over Richmond (particularly arrivals) seem to have significantly reduced over the last few weeks. This is based on looking at Flightradar, as well as listening to the noise ...
1
vote
0answers
34 views

Spin Entry and Recovery Training

Do trainee pilots learn to enter into spin and recover out of it in any basic trainer aircraft ? Does any regulation mandates this ?
1
vote
3answers
135 views

Why is airspeed different in climbs and descents although the AoA doesn't change?

Here are the background facts: This excercise has the objective to familiarise the student with the slow flight characteristics. The steps are: 1)Establish straight and level, 90% RPM, 15 units ...
2
votes
1answer
53 views

Does the F-35B use its articulating rear jet nozzle for thrust vectoring?

Does the F-35B use its articulating rear jet nozzle for thrust vectoring?
1
vote
3answers
209 views

Why in helicopter autorotation phase the opposing torque is eliminated?

As you many know, according to Newton's 3rd law for every action there is an equal and opposite reaction, as the main rotor of a helicopter turns in one direction, the fuselage tends to rotate in ...
1
vote
1answer
34 views

What is the difference between an Non-Directional Beacon and a Compass Locator Beacon?

What is the difference between a Non-Directional Beacon and a Compass Locator Beacon?
0
votes
0answers
53 views

Why doesn't the A330/A340 have a stickshaker?

When an A330/40 is in alternate law1 and approaching a stall, it has a stall warning composed entirely of a cricket chirp and a voice saying "stall, stall". Most other aircraft, in contrast, have a ...
0
votes
2answers
96 views

Why is there conflicting nomenclature for the 1,000 ft runway markings?

The two thick solid lines on runways at 1,000 ft from the end of the threshold are called "fixed-distance markers" in some documentation, and in others, it is called the "touchdown zone marker". Are ...
1
vote
0answers
13 views

How is The Published Runway Touchdown Zone Elevation Decided?

The touchdown zone of a runway can be up to 3,000 feet long if the information I have is accurate. How is the published Touchdown Zone Elevation determined? Is it the center, an average of the ...
3
votes
1answer
81 views

Why does 14 CFR have skipped subparts in my ASA 2019 FAR/AIM book?

As an example, part 91.101 skips every even number until 91.126. Why are they not in sequence as 101, 102, 103, etc?
1
vote
1answer
66 views

What is an obstacle identification surface and why would a pilot intentionally penetrate it during an ILS approach?

What is an obstacle identification surface? Why would a pilot intentionally penetrate it during an ILS approach?
2
votes
1answer
157 views

What navigation systems were used by the Space Shuttle during reentry?

What equipment did the Space Shuttle orbiters carry to support navigation during reentry? Were there any differences between the individual orbiters in this regard?
6
votes
1answer
72 views

Where does the factor 1.3 for Vapp come from?

The approach speed Vapp is usually given as 1.3 * Vs0, or 1.3 times the stall speed in landing configuration. Why 1.3? What created a consensus of 1.3 * Vs0 as the generally accepted textbook ...
0
votes
2answers
53 views

Do I have to follow airways to meet the IFR cross country 250 NM flight requirement in 61.65?

I understand that there is cross-country flight of "a distance of at least 250 nm along airways or ATC-directed routing" requirement for the IFR rating, but I'm not sure if understand what the second ...
2
votes
3answers
52 views

Why are some legs of a SID considered transitions, even when there's only one?

For example, consider the BAYPO8 departure from Tampa (KTPA). The CAMJO waypoint is the final waypoint on a rather linear route that does not contain other final waypoints. The second page of the FAA ...
-1
votes
1answer
89 views
-3
votes
0answers
57 views

what would be the cost and TAT for a 787 vip config simple vip [on hold]

what is the cost to reconfig a boieng 787-800 to vip? what would be the TAT? where do you take a b787-800 for vip config? how is a config vip project managed?
-1
votes
0answers
47 views

Leasing costs engines and aircraft dry lease [on hold]

What would be the cost of a 3 year operational lease for two Boeing 737-800ng aircraft? Will this include the engines? question 2. What would be the cost of leasing two cfm56-3c1 engines to have the ...
1
vote
1answer
145 views

How and why would one call the cockpit of an A330 inside its nose gear bay?

According to this A330 call panel diagram, there is an option to call the nose gear bay with the MECH button. Where is the connection for this in the nose gear bay, and what would it be used for? The ...
3
votes
3answers
186 views

Why do aircraft stall warning systems use angle-of-attack vanes rather than detecting airflow separation directly?

Stall warning and protection systems on essentially all aircraft work by using several hinged vanes on the side of the fuselage (usually at least three, and preferably more), which align themselves ...
2
votes
2answers
100 views

How is US Class B airspace enforced in Canada?

Detroit, MI is the center of Class B airspace, however a good portion of that airspace within the inverted wedding cake is in Canada. What are the mechanisms that allow US to define Class B airspace ...
0
votes
0answers
54 views

How future flight fares are gathered by Google flights? [on hold]

I have checked Google Flights and many other online OTAs, displaying flight fares for future dates (extending upto 1 year). How are these rates decided and from where these data come? Are these rates ...
-1
votes
1answer
141 views

Can I carry a waveform generator with me inside an airplane? [on hold]

I have recently learned that I have an urgent domestic flight tonight. I am curious about whether I can carry the device with me. The device I want to carry is 33120A Arbitrary Waveform Generator. I ...
-1
votes
0answers
98 views

Any idea where I can find this aircraft bracelet? [on hold]

Been searching for this all over the internet for the past week or so and I still couldn’t find it so I figured perhaps someone here owns or knows where I can buy such bracelet. Thanks
8
votes
2answers
836 views

What is the effect of altitude on true airspeed?

I know that wind is taken into account when we compute the TAS(true airspeed) and GS(ground speed). However what is the relationship between the TAS and altitude? For example: What is the true ...
4
votes
1answer
266 views

When was Kai Tak permanently closed to cargo service?

Kai Tak Airport in Hong Kong was closed to both passenger and cargo service early in the morning of 6 July 1998, with all flights moving to the brand-new airport at Chek Lap Kok. However, shortly ...
2
votes
6answers
358 views

How does the engine produce aerodynamic lift at high angle of attack?

This answer asserts that "at high angle of attack the engine is producing aerodynamic lift". In the context of that answer, we are concerned about the increased torque that raises the nose of the ...
-2
votes
0answers
64 views

Error code 57 on the elevator [on hold]

We get error 57 on my flat elevator. Can anyone help diagnose the cause? Thanks!

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