Newest Questions
26,411 questions
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Value of pressure altitude in high pressure weather system
When pressure altitude is calculated as a negative value due to a high pressure weather system, what value should a transponder broadcast?
For example the pressure where I live is 1021hPa today so the ...
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-2
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1
answer
67
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Why was the Hudson river landing that impressive? [closed]
The "Miracle on the Hudson", US Airways Flight 1549. It is easy to see how it can be considered a miracle, considering how many things came together at once to make it one of the few ...
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0
answers
18
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Database of max landed weight for aircrafts [closed]
Is there a publicly accessible database or API to access max gross landed weight for all aircraft currently operating in the US or internationally.
I'm aware that the FAA publishes a list but I find ...
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3
votes
0
answers
31
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How does the engine determine what full climb thrust is?
I fly the A350 and when full climb thrust is selected, I have noticed that the thrust target can vary. The A350 uses % THR as the primary parameter and I have noticed that sometimes with full climb ...
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0
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21
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I am a Sport Pilot and want to fly a Seaplane
I am a Sport Pilot and want to fly a Seaplane, what addition training do I need?
-3
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0
answers
73
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Jeju air crash. Transcript of conversation with ATC [closed]
It has recently been reported that the last 4 minutes from the black box and cockpit voice recorder of the recently crashed Jeju flight 2216 is "missing". The flight terminated at 9:03AM ...
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4
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2
answers
569
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How to tell the difference between an F2, and an F16
How do I tell the difference between the Mitsubishi F-2 and Lockheed Martin F-16? I mean by even if you don't see the livery.
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1
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1
answer
41
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Difference between 'acknowledge' and 'confirm' in standard ATC-pilot phraseology?
I wonder if an experienced aviator could help me to figure out the difference between 'acknowledge' and 'confirm' in radio transmissions.
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5
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1
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505
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What is the purpose of this duct punched in wings of LCA Tejas?
What is the purpose of this duct that is directly punched in wings of LCA Tejas? Is it to create a vortex during high AOA?
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0
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36
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The APU Fuel Pump Canister
I have some questions about the APU Fuel Pump Canister (28-22-52). What is it used for and what are its working conditions? Where can I find the information about it? I haven’t found any information ...
7
votes
1
answer
554
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How do 737 airstairs operate on standby with BAT switch OFF?
Image: B737Theory
Holding the NORMAL/STANDBY Switch to STANDBY provides DC power
from the battery bus for airstair operation. The BAT switch on
the flight deck does not need to be ...
- 3,403
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1
answer
167
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Why does a higher flight speed increase roll rate?
Not counting super slow speed flight, why does a higher flight speed increase roll rate?
Say that your aircraft is cruising at 300 knots. There is an amount of aerodynamic damping taking place when ...
- 3,752
1
vote
0
answers
124
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Request for consistent explanation for lift [closed]
Has anyone an authoritative reference providing a consistent explanation for the generation of lift? I have read Anderson's 2017 Fundamentals of Aerodynamics and Prandtl's 1922 report to NACA, but ...
- 133
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vote
1
answer
123
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Why does the IL-76 have engines with a low bypass ratio?
I know there are many advantages to using a high bypass ratio turbofan engine like the B-777. But why does the IL-76 use a low bypass ratio turbofan engine like the early B-707?
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0
answers
17
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DJI propeller placement [migrated]
Most of the new drones of DJI (MAVIC series) has its prop with a litle OUTWARD TILT.
what the use of this Tilted Prop placement?
whats its Impact in flight characteristics compared to normal ...
- 157
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52
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What recent regulatory improvements have been made to enhance communication with jetliners? [duplicate]
Over the past few years, there have been several cases where Aircraft couldn't be located in flight.
Have there been any improvements in regulations that would mandate continuous communication between ...
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2
answers
1k
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Is it possible to make a flight simulator that can model aerobatics and stalls accurately?
Is it possible to model aerobatics (spins, lomcevaks, stall turns, knife-edge flight, snap rolls, etc) in a flight simulator accurately? Why do no flight sims on the market model these maneuvers?
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2
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2k
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Why do the A-4 Skyhawk and T-38 Talon have high roll rates?
Why do the A-4 Skyhawk and T-38 Talon have high roll rates?
What is the underlying physics behind their exceptional roll performance?
Is it related to their mass distribution being concentrated along ...
- 157
0
votes
1
answer
72
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Ground Training options?
I've always been passionate about aviation and I would really like a PPL. However, I noticed that I need a ground training endorsement in order to attemp the FAA knowledge exam. As of now for me ...
- 434
1
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0
answers
85
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C130J - AE2100D3 Engine - Do dirty landings affect the development of burnthrough in NGVs?
Burnthrough fundings in AE2100D3 engine that experienced exessive amount of dirt landings
1
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0
answers
77
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Test fly a C152 registered in Spain on my UK/EASA licence
I am an aviation engineer and have been asked to repair a plane in Spain. I am a PPL pilot and have a UK/EASA licence. Can I legally test fly an EC registered plane?
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1
answer
170
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Clearance for formation flight of some sort in US airspace
In this video -
From 4:17, these two pilots begin flying some sort of formation flying from KSMX (Santa Maria Public Airport) which is not non-towered. Looks like they'...
- 4,202
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1
answer
75
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What is the typical thickness for aircraft spar webs? especially for a COIN aircraft HTP?
I'm currently doing a college assignment about initial sizing of a new twin-boom aircraft design similar to OV-10 Bronco, and now i am having trouble on whether my calculation for the HTP spar webs is ...
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0
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48
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Can Aircraft Movements Double or More Than Double with the Addition of a Second Parallel Runway? [duplicate]
I’m curious about the potential impact of adding a second spaced parallel runway at an airport. Specifically, can the number of aircraft movements double or exceed double with this addition, assuming ...
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1
answer
1k
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Air launch separation mechanism
Aircraft like the X-15, Ryan Firebee, Stratolaunch Talon A, etc., are air-launched from a mothership. I am curious about the separation mechanisms of such aircraft from the mothership pylon, but could ...
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1
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92
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What is the ENGINE number sequence, from starboard to port side? [duplicate]
What is the ENGINE number sequence, from starboard to port side? Is it any different for an 8 engine aircraft?
7
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2
answers
960
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Preventing icing in below zero Celcius conditions during taxiing
I'm trying to find a way effectively remove and prevent icing on an ultra light airplane (e.g. wt9 dynamic) in below zero conditions with relative humidity around 80%.
The issue I have is as follows. ...
- 173
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0
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60
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Difference betwwen AIRBUS Helicopter Technical Documents [closed]
I need to Know when&why Airbus issue a new and the difference between them:
Information Letter
Information Notice
Letter Service
Lettre Information Technique
Safety Information Notice
Safety ...
4
votes
1
answer
550
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Glideslope antenna structure and alignment
In this picture of a glideslope antenna, it is visible that there are three metal beams on the glideslope antenna for the runway. From a Google search, I think there are called dipoles.
In this ...
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1
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41
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DC SFRA flight plan requirements
Do I have to file a flight plan in the DC SFRA if I’m only going to an airport in the 30 to 60 mile “speed ring” while using flight following. No part of the route is inside the 30 mile ring.
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133
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Why does the engine of an Airbus A320 sound more rough than that of a Boeing 737? [closed]
The Airbus A320 is a rather fancy plane regarding technology, but as a passenger I was disappointed by the engine sound:
It seems to be rather loud, rough, and a bit "scratchy" compared to ...
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Source/Directory of Airbus "Getting to Grips with..." Documents
In an answer to another Aviation StackExchange question, I just came across an Airbus Flight Operations Support & Line Assistance "Getting to Grips with..." document. It detailed fuel ...
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4
answers
248
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How can one detect a clear-air turbulence with the naked eye?
A previous revision of Wikipedia stated:
Clear-air turbulence is usually impossible to detect with the naked eye
How can one detect a clear-air turbulence with the naked eye?
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215
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What are the reasons for using fir trees for turbine blade roots?
In large civil gas turbine engines, dovetails are used for fan blade roots and fir trees are used for turbine blade roots.
Source.
Is there any technical reason for replacing dovetails by fir trees ...
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1
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106
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From what aircraft would this Compass have come from?
The plate on the box reads -
COMPASS-ASTRO
AN-5738-1
Manufacturers Part No.D500
Order No. (33-038)45-10978-P
SPERTI,Inc.
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1
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146
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Why did flight UA35 from SFO to KIX that lost a tire at SFO on 2024-03-07 get rerouted to LAX instead of SFO?
Why did flight UA35 from SFO to KIX (Osaka, Japan) that lost a tire at SFO on 2024-03-07 get rerouted to LAX instead of SFO?
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3
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On a light aircraft, should I turn off the anti-collision light (beacon/strobe light) when I stop the engine?
Instructors have inconsistent opinions and reasons about turning off (or not) the anti-collision light when stopping the engine.
Some say we do not need it when the propeller is stopped.
Others say it ...
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3
answers
2k
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Do all International airports need to be certified by ICAO?
Amidst the recent accident of Jeju Air Flight 2216 in South Korea, and many experts mentioning that there was a bad construction design of the embankment holding the ILS array, I think I've heard long ...
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0
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13
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Dimension spar webs and spar caps [migrated]
Hello aviation community!
I would like to ask how one proceeds with dimensioning the spar caps and spar webs of a wing? As in the process of doing so.
This is just based on some experimental ...
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31
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EASA Equivalent of CAA CAP 697 and CAP 698 Training Documents
I am wondering if by now there are EASA-issued documents containing the same information as the CAA examinations training documents CAP 697 ("Flight Planning Manual") and CAP 698 ("...
- 1,974
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Historical Delta Airlines Tail numbers (2012) - Where to find?
I was looking for the tail numbers of 2 flights. The only records I could find were the US Transportation data for domestic flights but I could not find any International Delta Airlines Flights.
The ...
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2
answers
326
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Leaning Mixture Methods
I just started my PPL training. I was going through the procedures of leaning the mixture during cruise and found that different instructors use different methods.
My instructor asked me to lean the ...
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3
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2k
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Can a belly landing stop more slowly than a regular landing? If so, why?
I read on the Wikipedia page about the Jeju Air Flight 2216 crash today:
The aircraft overshot the runway and struck an embankment holding the ILS array while attempting a belly landing after its ...
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3
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Why build a sturdy embankment at the end of a runway if there isn't much to protect beyond it?
I read on the Wikipedia page about the Jeju Air Flight 2216 crash today:
The aircraft overshot the runway and struck an embankment holding the ILS array while attempting a belly landing after its ...
- 1,095
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1
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93
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FMA alignment on A220
I have been doing some research on the A220, and one thing that has confused me is the alignment of the flight mode annunciator on the PFD. Take a look at the autothrottle mode on the far left of the ...
3
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2
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261
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How does tip stall severity vary between normal tapered, leading-edge tapered, and trailing-edge tapered wings with the same taper ratio?
I'm trying to understand how the geometry of a wing's taper affects tip stall severity. Assuming the taper ratio is the same, how would the tip stall characteristics differ between:
A wing with a ...
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108
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Is there a term for additional casing that extends above the main fuselage?
There is a Russian term for this, which doesn't sound like a Russian word, гаргрот (something like gargrote in latin letters) which Wikipedia page doesn't have links to other languages (save for ...
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1
answer
460
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Which was the first "business jet" equiped with supercritical wing?
Supercritical wings are common in today's large aircrafts. Looks like the Vickers VC10 was the first airliner using this wing but I didn't find anything related to small jets. I've been told that the ...
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1k
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Can anyone identify this early biplane from 1920?
The photo was taken in August, 1920, and I believe it was taken in France.
The plane nosedived just after this photo was taken (I have 3 other photos showing the wreck). The crash didn't look ...
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3
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1
answer
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GNS 480 - OBS resolver calibration fails
Question about VOR/OBS use with a GPS...
I'm installing a GNS 480 in my Cessna 150. I'm retaining the Bendix King KI-209A CDI in the plane.
I've got the resolver plumbed back to the GPS, but when I ...
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