All Questions

1
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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?
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 ...
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, ...
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 ...
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 ...
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 ...
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
3
votes
3answers
85 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 ...
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
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 ...
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 ...
0
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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 ...
0
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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
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-...
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?
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 ...
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 ...
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. ...
7
votes
3answers
4k 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 ...
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
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!
0
votes
1answer
96 views

Gulfstream G650 fuselage smoking rivets [on hold]

Any G650 operators seeing 'smoking' rivets on the fuselage at various locations?
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 ...
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 ...
-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 ...
-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 ...
-4
votes
0answers
132 views

What does aerodynamics have to do with anything? [on hold]

Well guys here I am again, I recently started taking flying lessons in a plane. See my previous question: What do I need to get my pilot license? I enjoyed it very much, looked out of the window to ...
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 ...
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 ...
1
vote
0answers
42 views

How to implement an intelligent control technique for a quadcopter [on hold]

I have a drone weighing less than 250g. The position of the drone is continuously monitored using an overhead camera having a refresh rate of 30Hz and the drone has a marker attached to it for ...
-2
votes
0answers
40 views

guidance with waypoints [on hold]

*I look at the ata boeing but I still do not understand so can you explain to me the principle of the guidance to follow a route described by the flight plan and constituted by waypoints?**
0
votes
1answer
54 views

Is the 737-800 circular PFD for AOA or RA?

So, I have seen some people on the Internet showing the 738's PFD circular gauge for RA, but others show that the gauge is used for AOA(angle of attack). Which one is true? Is there a switch to change ...
0
votes
1answer
52 views

Wind shear questions

I had a discussion and I'm curious on an experienced pilots knowledge. When taking off, let's say from telluride. You have a tailwind, but when you get off the ground you experience and windshear ...
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 ...
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 ...
5
votes
0answers
50 views

Why is the 737’s aileron/spoiler authority reduced at low flap settings?

According to the NTSB report on the crash of United Airlines Flight 585, the ability of the 737’s lateral controls (ailerons and flight spoilers) to counteract the rolling forces produced by (say) a ...
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 ...
-2
votes
0answers
50 views

What elements are required for an airplane to generate lift? [duplicate]

I'm not a scientist but what basic things does a plane need to get lift? Does it have to do with the flow of air produced by the shape of the wing as the plane moves forward on the runway? What would ...
2
votes
1answer
174 views

Are WWII turbochargers reliable?

How reliable are WWII turbochargers? Does adding them to an otherwise reliable engine, e.g. the P&W Double Wasp and the Allison, decreases the overall reliability of the engine? Are they well made ...
1
vote
1answer
73 views

How does propellers' pitch change during the use of reverse thrust in turboprop/propfan propelled planes?

Which way do proplellers turn during the use of reverse thrust in turboprop/propfan propelled planes: A) Do the leading and trailing edges of propellers remain the same or... B) Do the propellers ...
9
votes
1answer
2k views

Do rivets on airframe need special sealant to be airtight on pressurized airliners?

Do rivets on airframe need a dedicated sealant, e.g. epoxy, to be really airtight on a pressurized airliner, or is the expansion of the rivet shaft already sufficient? As a side note, how are carbon ...
5
votes
1answer
158 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 ...
1
vote
1answer
232 views

Can I legally land an airplane in in Badwater Basin, CA?

Would it be legal to land a light plane in the Badwater Basin salt flats in Death Valley National Park? Let me add that you can obviously land in the park, as you have runways at both Furnace Creek ...
4
votes
4answers
161 views

Do airline pilots use speed stability to cope with unreliable airspeed indications? If not, why not?

There have been a couple of airline accidents in which unreliable airspeed indications (or the fear thereof) have played a role: Birgenair Flight 301 in 1996, where one of the pitot tubes was blocked,...
3
votes
1answer
145 views

Why are the Convair 880's yokes shaped differently from each other?

Looking at this picture of a Convair 880's flight deck... (Image originally by the San Diego Air & Space Museum at Flickr, via Wikimedia Commons) ...the captain's and first officer's control ...
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 ...
7
votes
1answer
106 views

What does I1001 mean in a METAR remarks?

Here is an actual METAR example: KOMA 190352Z 36017G26KT 3SM -SN OVC012 M08/M11 A3014 RMK AO2 PK WND 36027/0302 FZDZE37SNB27 SLP220 P0000 I1001 T10831111 $ What ...
5
votes
1answer
310 views

Why Western fighters' afterburner glow is reddish orange while Eastern Bloc fighters' is blue?

Recalling what little physics I know, this could be explained by two factors: The blue color is given by the characteristic EM radiation of C-H bond breaking, C- and H- radicals forming and ...
0
votes
1answer
48 views

What airfoil type is used on the B727-200F?

What airfoil type is used on the Boeing 727-200F? Is it a NACA profile or something else?
3
votes
1answer
86 views

Where can I find drawings or diagrams of the Boeing 737-800's internal layout? [on hold]

I am working on an alternative fuel system for my final school research. I am applying it to the 737-800. Now I could not find info on how the internals are situated. Of course pictures of the cabin ...

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