All Questions

0
votes
1answer
87 views

What is a registration mark or number?

Does every single aircraft have a unique registration mark or number? If, for example, 2000 Boeing 777 units were produced, do they have their own registration number? And how is that registration ...
0
votes
2answers
72 views

Is the Meredith Effect Utilized in Cowling Design of Air-cooled Engines?

The P-51 is famous for its advanced-for-its-time aero, the prime example of which is the radiator design under the belly which utilizes the Meredith Effect that in effect turns it into a mini jet ...
1
vote
1answer
77 views

Why does the Convair 990 produce this howling sound during landing?

Watching this video of a landing Convair 990, one can hear a whooshing howl at about 0:11-0:12, as it flares just prior to touchdown (not to be confused with the run-of-the-mill howling that you can ...
1
vote
0answers
56 views

Why is the detcord on canopies wavy?

We know that the wavy lines on the canopy are detcord, to shatter the glass in case of ejection. Why are they wavy?
3
votes
1answer
69 views

How are altitudes handled with airports near or above transition altitude?

Transition altitude refers to the altitude above which all altimeters are set to a standard pressure setting (typically 29.92 inHg) instead of to the local surface pressure, and altitudes are given in ...
2
votes
1answer
95 views

Would increasing rotor disc diameter increase efficiency in a helicopter by reducing disc loading?

Despite the obvious drawbacks of a larger rotor diameter would the reduced disc loading increase efficiency during hover and forward flight?
3
votes
3answers
86 views

Why do carburetors tend to produce richer mixture at higher altitude?

The pressure drop in the venturi is proportional to air density and the fuel is at ambient pressure in the float chamber, so I would expect the fuel flow to reduce proportionally with density, and ...
1
vote
1answer
84 views

Who should design the nozzle of jet engines on aircraft?

There is a question in my mind that which company should design the nozzle of jet engine - the aircraft designer or the engine designer? If you watch this documentary: BBC Documentary Rolls Royce ...
1
vote
1answer
27 views

Which pilot (pilot flying, pilot monitoring) handles CPDLC (operates CPDLC interface)?

This question relates to commercial flights, typical two-pilot crew: In some airspaces, e.g. North Atlantic, pilots and Air Traffic Control use Controller Pilot Data Link Communication (CPDLC, ...
0
votes
2answers
64 views

In what conditions are visible Wingtip vortices created?

If I would want to create a visible wingtip vortices on a given plane, what are the conditions that I would need to meet? Wikipedia gives the following explanation: The air cools adiabatically in ...
2
votes
0answers
22 views

Can you guide me about Purpose of Fine alignment in inertial navigation system?

I am new in inertial navigation field. I have some confusion about fine alignment process of INS. I want to ask that what is purpose of fine alignment? I know by process of alignment we find the ...
16
votes
2answers
52k views

How are take-off segments defined?

From take-off performance calculations I remember that the take-off and initial climb was expressed in a number of segments. Each segment had its own performance requirements. I presume they are ...
5
votes
4answers
1k views

Can this design provide more lift force than thrust from engine?

The problem is depicted in the picture: Generally, why we don't use engine blow wings to fly? Can we use wind-tunnel-like wing to generate lift force? Can it generate more lift than thrust? If it ...
7
votes
1answer
101 views

Was the foil in older FDRs reused when it ran out, or replaced?

Before magnetic tape became the standard recording medium for flight data recorders, most FDRs used a long strip of metal foil that had altitude, airspeed, etc. traces scratched into it by a set of ...
3
votes
3answers
165 views

What changes are needed for a piston-prop aircraft to withstand saltwater environment?

I'm interested in WW2-era piston-prop aircraft. I want to know what changes are needed to make the aircraft withstand saltwater corrosion. Presumably these are different and more expensive than the ...
1
vote
1answer
53 views

Are MSN numbers unique

Is it possible for two aircraft to have the same MSN number, I was under the assumption the an MSN was a unique identifier for an aircraft
7
votes
3answers
5k views

Why didn’t the Captain of Cathay Pacific flight 780 shut down engine 1 and land with a more reasonable speed?

In the approach phase, engine 1 of Cathay Pacific flight 780 got stuck at about 70% N1 and it forced the crew to do an overspeed landing (230knots). Why didn't they shut it off by turning the fuel ...
0
votes
0answers
19 views

How is static droop achieved in mechanical governors

The Bendix power turbine governor in the Bell 206 is just simple flyweight arrangement which controls a pneumatic signal to the FCU. How is static droop achieved in this type of system?
1
vote
0answers
59 views

If a twin-engine airplane's propellers both rotate in the same direction, do they still produce a left-turning tendency?

If an airplane with two propellers has both propellers with the same rotation direction (say, both the propellers rotate counter-clockwise as seen from nose to the tail), will be the four left-...
0
votes
0answers
31 views

Why is a stabilator more effective?

As far as I know, a stabilator is an elevator made up of the entire horizontal stabilizer. Why is it more effective?
1
vote
0answers
65 views

What authorization do I need to fly a rebuilt aircraft that doesn't have an airworthiness certificate yet?

Let's say I rebuild an aircraft in the USA and it does not have a current airworthiness certificate. The DAR requests a check flight during the process of issuing the new airworthiness certificate. ...
0
votes
0answers
30 views

Why do the 737-100/200’s thrust reversers blow fully open if hydraulic pressure is removed while the reversers are partly open?

If the thrust reversers on an Original-series 737 (the 737-100 and -200) are 2 inches or more from the stowed position, and hydraulic pressure is removed from the reverser actuators, the reversers ...
16
votes
3answers
6k views

Would a flight consisting of solely first-class passengers be cancelled due to center-of-gravity issues?

Consider any modern jetliner (narrow-body and widebody separately) in a standard 2 or 3 class configuration. If somehow only first-class or business-class passengers bought seats, would that plane be ...
1
vote
0answers
16 views

What's the difference between EFVS and CVS?

What's the difference between EFVS and CVS? Is there any aircraft certified with EFVS?
8
votes
4answers
4k 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 ...
15
votes
6answers
23k views

What's a quick way to determine which runway to use?

Let's say I call up Wx and have the wind direction and I know the runway headings from my charts and the pattern is empty. I can do the math, but it's tedious and slow and even worse when there are ...
10
votes
2answers
302 views

Was the runway upgrade at Mataveri Airport on Easter Island really related to the Lee Correy novel “Shuttle Down”?

This answer to the question Could the Space Shuttle have landed on any long runway other than those specially reinforced at Kennedy (TTS), and Edwards (EDW)? says: The Mataveri Airport on Easter ...
10
votes
2answers
4k views

How do you calibrate the compass of an aircraft on a compass rose?

A follow-up from this question; one of the answers mentioned that the compass rose in the picture was used to calibrate an aircraft's compass. But how does that actually work? Do you park the ...
14
votes
2answers
3k views

What does it mean to “firewall” an aircraft engine?

I (think) I understand what a firewall is (at least, in a single engine aircraft where the engine is at the front of the fuselage), but what does it mean "to firewall" an aircraft's engines, as ...
5
votes
1answer
159 views

What are possible causes for the flaps not deploying on a Cessna 172?

I would like to seek some expert opinion on why my flaps failed to deploy when I took it to Flaps 20. I was turning from Downwind to Base when I took flaps 20 and noticed that my speed was creeping ...
0
votes
1answer
97 views

Gulfstream G650 fuselage smoking rivets [on hold]

Any G650 operators seeing 'smoking' rivets on the fuselage at various locations?
1
vote
0answers
143 views

NOTAM - What means “no shoulders along taxiways” in German?

can anyone explain to me what "no shoulders along taxiways" means? I know what shoulder markings are, but I don't know how to translate them. Are there German people? :) Thank you!
7
votes
2answers
2k views

Can time logged in foreign aircraft be applied towards an FAA certificate or rating?

Does time logged in these foreign-registered aircraft (cross country, etc) count towards US certificates or ratings? Or is it flight experience that should be excluded from an 8710?
32
votes
14answers
58k views

Why don't small planes use turbine (turboprop) engines?

Turboprop engines are more fuel efficient1, lighter for the same power, mechanically simpler and consequently more reliable. They are also slightly easier to operate (no need to fiddle with mixture) ...
1
vote
1answer
69 views

Can an orienteering compass be used in place of a protractor?

First off, please forgive me if this is a stupid question. I was given a protractor during flight training, learnt to use it and obviously works quite well. However, I've started using my old maps ...
5
votes
2answers
431 views

Can I use my non-WAAS GPS receiver with ADS-B in the United States?

I have a older style Garmin 530. Can I use this GPS as the position source for an ADS-B installation?
6
votes
2answers
1k views

What was the reason for replacing the non-smoking sign with a “no electronics” sign?

When reading the following comment on question "Why do lavatories in modern planes still have ash trays?": Andra: November 05 2014 at 16:00 I have flown on an Embraer 195 where the no-smoking ...
14
votes
1answer
897 views

What is this object on an MD-11?

There is something above the engine on the tail of this MD-11: What is that? Source
3
votes
2answers
226 views

Are commercial pilots ranked or graded differently based on the size of the aircraft they fly?

I am not sure whether "rank" or "grade" are the most suitable words for this question. If someone know which the most suitable, please edit this question. I mean, is the rank of a pilot of, say a ...
2
votes
2answers
146 views

Do any aircraft automatically test that the pitot-static system is functioning properly before liftoff?

Given that a properly-functioning pitot-static system is absolutely essential for flight (a plane cannot be flown without valid airspeed data, or at least not for long), are there aircraft that ...
0
votes
1answer
78 views

How can I calculate which runway to use for landing, based on the wind? [duplicate]

I have a project where the user enters the name of the airport. We fetch the wind direction (degrees) for that airport. Then we use the wind direction and the data about the runways at that airport to ...
7
votes
2answers
109 views

Why do aircraft have a crossover airspeed, and why does it increase at higher vertical load factors?

According to the NTSB accident report on the crash of USAir Flight 427, all commercial aircraft have a crossover speed (the speed at which the maximum rolling force from the aircraft’s ailerons and ...
-1
votes
1answer
73 views

Is there a Standard Way to Segment the Aviation Market by Aircraft Activity? [on hold]

A common way to segment aviation at a high level is "General Aviation", "Commercial Aviation" and "Military Aviation". Additionally, this answer points to ICAO's method of categorizing civil aviation ...
35
votes
4answers
23k views

Why was Concorde's cockpit so complex?

Source Why was this cockpit much more complex than any other modern day aircraft or a fighter jet? It looks to have many more buttons and controls, and very small (interesting) screens. Also, its ...
21
votes
3answers
6k views

Can a low flying jet fighter lift water?

Can a low flying but super fast jet spray water from the surface of the ocean? I've seen this visual effect done many times in movies. It's often done to highlight supersonic speed just a few feet ...
17
votes
8answers
14k views

If flaps are used on takeoff, when should they be retracted?

If a pilot uses a notch of flaps on takeoff, when do they get retracted? At that time, what changes (i.e. climb rate, speed, pitch)? NOTE: I have purposefully not specified the type of airplane.
0
votes
1answer
94 views

What does ''NAV ILS OUT OF SERVICE'' mean?

Just curious about the NOTAM below: !SMF 01/045 (KSMF A0080/19) SMF NAV ILS RWY 16L OUT OF SERVICE 1901180419-1901262359 Does that mean only the glideslope is broken so we can still do a LOC ...
0
votes
1answer
38 views

Load testing a model glider wing

I wish to load test a model glider wing. The standard static load test methodology using sandbags on the upturned wing would be difficult as the chord of the wing is small - it will be difficult to ...
40
votes
3answers
101k views

What are N1 and N2?

When I'm reading something about jet engines, it's common to see references to N1 and N2. I've never fully understood what N1 and N2 are on engine instruments and how they relate to thrust and the ...
-1
votes
0answers
58 views

Monitoring ground support equipment at airports [on hold]

I have a simple technical question for tehnical/IT staff at airports. I'm wondering how do airport operators monitor and manage equipment like passenger boarding bridges, airport light systems and ...

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