# All Questions

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8 views

### Making a plane fit to fly after accidental emergency exit / slide deployment

Every so often there is a report of a person openening an ( armed ) emergency exit unauthorised on the ground leading to a slide deployment. Often this is followed by the flight leaving after ...
• 8,234
104 views

### PC-24 has a cargo capacity of only 400 pounds?

I went to book a PC-24 with 3 passengers weighing a total of 450 pounds and 700 pounds of luggage for a total of 1,150 pounds. I thought this was doable because the payload capacity of a PC-24 is ...
• 13k
16 views

### Are shockwaves responsible for heating in very sparse atmospheres?

I recall learning about hypersonic flow in high atmosphere. I think one of the modelling assumptions used is that the relative air flow is so fast, and the average space between molecules is so great, ...
639 views

### fuel shut-off valve left in over night. Is it dangerous for the plane?

Like in the title - I forgot to pull the shut-off valve in my plane while i was trying to start an engine. Does anyone know if this will have any effect on the plane? Thanks for the answers in advance ...
57 views

### Plane's amber lights meaning?

The pilots convey the information that his amber light are on and whether she cleared to further intersection holding point or not? Before this question I cleared him to a rear intersection holding ...
59 views

### Source of Air in pressurised doors

In pressure cabins, pressurisation is very important. To keep the pressurisation level balanced, rubber seals are used. Now what is the source of the air used to maintain this level of pressurisation?
• 1
1 vote
41 views

### Why is corrected engine speed is used for engines, even though the RPM of the engine is the same both on ground and at cruise?

I understand that mass flow rate has to be corrected because air gets thinner as altitude increase. But what I do not understand is why the corrected mass flow rate is always plotted with corrected ...
1 vote
75 views

### Does a plane's service ceiling vary with season/temperature?

Aircraft use barometric altitude, e.g. FL300 is the barometric altitude of 30,000 ft MSL. In winter however, FL300 is actually lower than the absolute altitude of 30,000 ft because of a cold and ...
52 views

### At what Mach number does a fan jet become more efficient than a turboprop?

Dynamic pressure is based on air density and the true airspeed of an aircraft. As one climbs, indicated airspeed can remain constant as true airspeed climbs, resulting in only minor changes in ...
• 14.7k
229 views

### When it comes to private airports those marked on sectionals with (Pvt) what frequency's do they use if any at all

As the title says for private airports and planes that fly in and out of them is there a frequency that they use and if so where can it be found?
• 65
61 views

### Fuel capacity of all models-manufacturers [closed]

I am using FAA database, but it does not contain fuel capacity and/or average fuel consumption for all models-manufacturers. Is there any other data source?
509 views

### Could an executive configured ATR 42-600 get 2000nm range?

Say you wanted to outfit an ATR 42-600 for executive transportation like a smaller version of an Airbus ACJ 220. For example, 2 living areas of 4 rows, 1 sleeping area of 3 rows (a double below and a ...
• 121
112 views

### Why isn’t the SU-57 used in Ukraine [closed]

The Russian Air Force currently has 12+ SU-57s in their arsenal. So why don’t they use it in Ukraine? Maybe it’s because there all fresh off the production line.
• 191
37 views

### Can short term escalation be applied exceeding life limit on Form 8130-3?

I have a case where there is maintenance item to replace a component when it reaches its life limit. This component life limit is stated on Form 8130-3 of said component referring to component manual. ...
• 1
4k views

### Other than the rest areas for the crew - what else is in the 'attic' of an aeroplane?

So I am seeing some information about crew rest areas in an aeroplane which typically just sit above the passenger cabin. In the image of the a350 XWB for example you can see those areas in the front ...
• 251
4k views

### What’s the difference between “Bandit” and “Bogey”

When I was watching Top Gun Maverick, the EWAC called the 2 incoming SU-57s “bandits”, but when Maverick says it he says “bogies incoming“. (Correct me if that isn’t what they said). So why don’t they ...
• 191
24 views

### Where is PTM message documentation? [closed]

In aviation there are passenger transfer messages like these: PTM AY1101/28JUN HELVNO PART1 AY1106/29 HEL 1N 0B AY1108 HEL 1Q 0B ENDPTM Where can I find ...
• 101
31 views

### Can you choose to swap to a PPL when learning a (EASA) LAPL?

If I were to start flight training for a (EASA) LAPL and decide later (before completing the LAPL) that I wanted to do a PPL instead, is a switch possible? Could the hours flown in pursuit of the LAPL ...
• 121
23 views

I hold a UK license and couldn't covert it to EASA. can I send my modules and tasks to any of EASA members and issue a license without needing to convert my license? My modules were issued from UK ...
93 views

### Can I work civilian aircraft with just an FAA Airframe certificate?

I am currently in the Air force, but plan on separating after my contract ends. I really like the field of avionics and aviation in general.(I am a B-1 Offensive Avionics Systems guy) However, when I ...
• 21
50 views

### 2D to 3D Non-Elliptical Lift Curve Slope Correction Factor Reference

I'm working on automating some aerodynamic calculations for a particular multidisciplinary design tool and in the course of setting it up I ran across this formula from the input theory manual  {CL_\...
54 views

### What will Boeing release after MAX? [closed]

I am well aware that it is very, very early to talk about this, but is there any information about what Boeing is going to replace the MAX in the narrow-body medium-range segment? The 737 design is ...
77 views

### Cessna 182Q (parachute operation) - climb leaning with CHT

for a 182Q the POH specifies for maximum climb to use 2400 RPM and full power with given speeds (78 KIAS for Sea Level, reducing to 72 at FL100). It specifies that the mixture may be leaned at 5000ft ...
• 424
2k views

### How come a turboprop can't reach speeds as high as a turbofan?

I understand that turbofan powered aircraft can reach much faster speeds than turboprops like the C130 Hercules, and I can't imagine a turbofan powered 737 would be of any use really, but as to the ...
• 51
5k views

### Who controls mood lighting on a commercial airplane?

Who is in charge of controlling the mood lighting on commercial airplanes such as the Airbus A350 and Boeing 787? How is it controlled?
46 views

### Cost for teletype type B (TTY) message exchange over SITA network

Does anyone know which party (sender or receiver) bears the cost of sending TTY messages over the SITA network that are commonly used between airlines, GDSs and different vendors. Thanks.
• 49
187 views

### Why did the US adapt the AIM-9X and not the ASRAAM IR missile? [closed]

I was looking and saw that the British developed a missile called the ASRAAM, which was not adopted by the United States. Why? Also, how do the AIM-9X and ASRAAM compare? In which situation would one ...
1 vote
273 views

### What does "203" mean?

In Top Gun (1986), Cougar, who is piloting a jet, speaks to a radar operator on radio about unknown aircraft: Cougar: Mustang. Mustang, this is Ghost Rider, 203. I've got him inbound, bogey heading ...
451 views

### Do symmetrical airfoils generate induced drag?

Cambered airfoils generate induced drag because they have a pressure differential between the upper and lower surface. However symmetrical airfoils don't. So does this mean that symmetrical airfoils ...
1k views

### What does "CATs three and four" mean?

I heard this line in Top Gun (1986) film: Airboss: Ready Willard and Simkin off CATs three and four. What does "CATs three and four" mean?
155 views

### How do I appropriately choose the power settings on a C172 for cruise?

Today during the ground portion with my instructor he asked me "why did you choose to cruise at 2300 rpm flying at 1990 ft pressure altitude?" I didn't have an answer for him, and I couldn't ...
21 views

### How would I draw the Max Thickness Sweep Angle on a wing from a Top View?

I have the Max Thickness Sweep Angle, Wing Tip and Root Chord Length, and Max Thickness to Chord Ratio defined. However, I am having trouble drawing the Max Thickness Sweep Angle on the wing because I'...
30 views

### The evolution of commercial airliner wing twist distributions over time

As far as I understand, wing twist is used by commercial wing designers to make the span-wise distribution of lift as elliptical as possible for tapered wings, increasing the span-efficiency factor ...
• 389
100 views

### How does Condensation Affect Lift?

Here are two pictures of condensation happening above the wing: The condensation happens because the pressure drops above the wing which in turn causes the temperature to drop. When the temperature ...
39 views

### How to find accurate civil aviation flight traffic data? [closed]

I need to review civil aviation flight traffic data for several regions around the world. My preference is real-time data, but data delayed by 5-15 minutes is fine. Historical data (going back 1 year)...
85 views

### How do the hydraulics in an airplane have constant pressures? What is creating resistance to the pump flow to create constant pressure?

my question comes from the A320 specifically, and I also suppose Boeing jets. Whenever you check the hydraulic system pressures on an A320 it says 3,000 psi, even when you move the flight controls. ...
• 21
1 vote
64 views

### 61.39 (a)(6)(i) CFI applicant checkride question

I am taking my CFI checkride on 6/30, the very last day my 2 calendar month endorsement was granted (4/26). In the event the air portion of the checkride cannot be completed by that day and we go up ...
• 403
177 views

### What happened to the engines on takeoff here (loud popping sound then silence) [closed]

What is the cause of the sound shortly after rotation in this short video? And does anyone know what flight this was and what happened? (i.e. incident report) as I can't find any news about a fatal ...
• 10k
43 views

### What are the limits for IFR legal heading indicator and compass?

I am a student pursuing CPL/MEIR at a flight school in Turkey that's equivalent of a part 141 in the US. Our instrument equipment check procedures for IFR flight contains comparing the compass heading ...
1 vote
106 views

### What's the meaning of this Slider's question?

In Top Gun (1986), enemy flighters shot down flighter name Hollywood so Iceman and Slider trying to take them down: ICE: I'm going after them. I'm bringing it around to the left. SLIDER: We got four ...
72 views

### Did the Nazis ever have a pulse jet hovercraft?

I recently read an article about experimental aircraft Nazis had made during WW2. And one aircraft caught my attention.It was a experimental aircraft Named “Die Glocke” It was first described by a ...
• 191
528 views

### Why would the U2 descend more quickly with its engine on than off?

I was talking to someone who got to fly in the U2. He mentioned that the pilot said that a descent from 70k' would take two hours with the engine working, or three hours without. I have every reason ...
• 3,210
700 views

### How would you enter this approach with a racetrack course reversal at EGPH from the southwest?

For reference this is the NDB ILS DME RWY 24 approach at EGPH. When arriving from the south/southwest, I am sure you would be vectored in but i am interested as to how this would be done without ...
• 53
82 views

### What's the purpose of categorizing alternate airdromes?

Why do we have alternates in categories of take off alternate, enroute alternate and destination alternate. Does this really need to categorize in groups or it's just pointless issue?
• 23
1 vote
62 views

### How to Calculate Duct Pressure of Boeing 747 ECS?

I am creating a home flight simulation expansion of the Boeing 747 classic series and I have come across an interesting and hard to answer question involving the ductwork of the airplane. The 747 uses ...
3k views

### What is the purpose of the fuel pumps in the A320?

It might seem like a really stupid question, But i'm getting into flying the FBW A320 in MSFS2020 and I have no idea what the fuel pumps are for in the A320, please may someone explain and help a ...
• 69
57 views

### Why does the torque curve of free shaft gas turbines keep gradually dropping as RPMs increase?

When i look at the output shaft torque curve of a free shaft gas turbine i can see that they are almost like an electric motor. It makes peak torque at very low rpm and then torque keeps gradually ...
48 views

### What can you do with an ATP that you can’t with an R-ATP?

So I know about the different requirements for an ATP vs R-ATP but I can’t find what you are able to do with a full ATP that you can’t do with an R-ATP
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183 views

### Does the FAA have control over private "airparks"?

We were informed a neighbor is planning a 2800 ft. X 150 ft. asphalt "air park" on property behind our home. The end of the runway is to be 360’ from our bedroom windows. As our home is in ...