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Questions tagged [descent]

Use for descents in general, else use [approach] or [landing].

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6 votes
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Optimising Continuous Descent Approaches (CDA): Seeking Strategies and Rules of Thumb

Ideally, approaches should be executed as a continuous descent approach (CDA), maintaining idle thrust and only levelling off (or reducing vertical speed to <500 fpm) briefly to reduce speed, while ...
tedioustortoise's user avatar
2 votes
2 answers
385 views

In which position does Starship wings produce the most drag?

I was watching the video from a few years ago where SN15 did the flip manoeuvre and landing. The actuated fins (lower flaps) can help Starship to pitch while during its descent. However, I am ...
The Rocket fan's user avatar
1 vote
2 answers
112 views

The role of accurate DES FORECASTS for descent planning in VNAV, during the latter stages of an approach

Giving an accurate set of criteria in the “DES FORECASTS” page of the FMC helps produce an accurate descent path. Typical Descent Profile, Vertical Path Adjusting the “TAI ON/OFF” (Thermal Anti Ice), ...
tedioustortoise's user avatar
7 votes
2 answers
593 views

Is it realistic for a WW2 aircraft to dive to extinguish an engine fire?

In the film "Memphis Belle" there is a scene in which the titular plane is successfully put into a steep dive in order to extinguish an engine fire. This may have been the inspiration for a ...
Party Ark's user avatar
  • 13.6k
1 vote
0 answers
47 views

Are Runway Profile Descent charts available to non-121 carriers? If so, where can I find them?

AIM 5-4-2(c) says: When crossing altitudes and speed restrictions are issued verbally or are depicted on a chart, ATC will expect the pilot to descend first to the crossing altitude and then reduce ...
Steve V.'s user avatar
  • 23.3k
0 votes
0 answers
143 views

IDLE Factor determination

The Flight Management System (FMS) utilises the Idle Factor to modify the computation of the vertical profile whilst descending. During this phase, the FMS calculates the vertical profile and ...
alQ's user avatar
  • 75
0 votes
3 answers
99 views

How does changes in Power vary the aerodynamic forces on an aircraft?

When we make changes to the Thrust by adding or removing power. In what way does it affect the other forces? As Power controls Rate of Climb or Descent of an aircraft, How is it acting on the other ...
Nish's user avatar
  • 597
8 votes
1 answer
2k views

How can a pilot fly a descent angle of 4° in an A320?

Would any A320 pilot be able to share any tips regarding maintaining a descent rate for final approach of 4°? Of course this is in case of manual flying. I know we can use a descent rate of speed*5 ...
R O's user avatar
  • 99
1 vote
2 answers
205 views

LFLL LSE VOR 35L Visual Approach

Was wondering whether someone could help me understand how to perform a visual approach (not using the VOR) specifically if I look at RWY 35L at LFLL. Airport elevation is 821 ft. It's a 3° GS ...
R O's user avatar
  • 99
7 votes
2 answers
513 views

Autorotation Index: The more gravity, the better?

I have been working on helicopter design and autorotation for a while. An Index used for this is the so-called "Autorotation Index" Evan A. Fradenborugh derives it in this work https://doi....
Clex's user avatar
  • 173
4 votes
0 answers
200 views

Why did this flight descend way below usual path?

I flew on UAL2086 last night which is a regularly scheduled flight from KIAH to KLAS, this particular plane was a 737-900 - N79402. We took off early and had no issues until we arrived in Arizona when ...
Paul's user avatar
  • 41
1 vote
4 answers
978 views

How do pilots know when they have to start the descent?

I am trying to understand how pilots do know when to start descending, I have read that mostly it is from the FMS information and ATC clearances (Aviationvector.com). And on some other references, ...
Luis otell's user avatar
14 votes
3 answers
789 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 ...
Kenn Sebesta's user avatar
  • 5,152
12 votes
3 answers
2k views

Are there aeromedical reasons to avoid too-rapid descent in hypoxia?

I recently watched this video: When the controller realized the pilot was hypoxic (at about 9m47s in the video) they said, Kalitta 66 if able descend and maintain FL260 ...
kojiro's user avatar
  • 417
0 votes
2 answers
1k views

Delays between "50", "40", "30", "20", and "10" cockpit announcements

When a large airplane is about to land, the following announcements are heard in the cockpit: "Fifty!" (delay) "Forty!" (delay) "Thirty!" (delay) "Twenty!" (...
Latest Glitch's user avatar
2 votes
4 answers
351 views

What is the decrease in power when a drone is in descent?

For a quad-copter, or a fixed-wing drone with quad-rotor formation, how much would the power of the motor decrease when a constant speed descent is needed to bring the drone back to the ground? Does ...
Faito Dayo's user avatar
13 votes
1 answer
1k views

Does this Hawaiian Airlines descent look routine?

I was on flight HA 30 from Kahului to Seattle on Dec 19 2021 (Dec 20 Zulu time). FlightAware track log FlightRadar24 track log The descent looked anything but familiar. As you can see it reached over ...
Bax's user avatar
  • 313
2 votes
1 answer
487 views

How do flights fly on some special days when there are firecrackers bursting near the source/destination airport? [duplicate]

I mean there might be festive nights like New Year eve, when there is spectacular display of colorful firecrackers in the sky, but when there are flights descending or ascending near a city with an ...
lousycoder's user avatar
0 votes
0 answers
43 views

Assuming a descent at 250kt IAS and idle thrust, will the resulting ROD be higher at a higher GW, or lower? [duplicate]

I was recently told by a pilot that it works in inverse order: Keeping indicated airspeed steady, and using idle thrust, the rate of descent will be lower with a higher gross weight (and a higher rate ...
Stamatis Vellis's user avatar
5 votes
2 answers
970 views

Can the energy dissipated in a power-off descent be calculated and expressed in horsepower?

If the weight in pounds of an aircraft is known along with its sink rate in feet per minute at best power-off glide conditions, can the horsepower being dissipated by drag as the plane descends via ...
niels nielsen's user avatar
13 votes
5 answers
11k views

Why did my plane descend nose down?

I was on a flight recently and the plane started to descend normally etc. However one cabin crew member randomly announced "remember if we have an emergency landing please leave all your ...
Elise Barker's user avatar
4 votes
2 answers
327 views

Are there more refined rules-of-thumb for Top of Descent calculation, than the simple FL x 3?

Forgetting the excellent capabilities of VNAV for a moment and reverting to simpler days, is there a rule of thumb to further refine the FL x 3 rule for Top of Descent calculation, when there are ...
Stamatis Vellis's user avatar
1 vote
1 answer
130 views

What would be the expected approximate ROD when descending at 250 kt IAS using LVL CHG at 10,000 ft, assuming a GW of 60t?

The question refers to a B737NG but I suppose most similarly sized airliners would show a similar ROD under the circumstances.
Stamatis Vellis's user avatar
1 vote
1 answer
495 views

How does deploying flaps change the gradient and rate of descent?

My understanding is: Using the gradient formula "(T-D)/W x 100", we can see that with the deployment of flaps, the gradient would reduce (due to the drag added). And since Rate of Descent (...
De_'s user avatar
  • 43
2 votes
1 answer
4k views

What are the various thrust modes in the Airbus A320?

I was going through A320 AFM and came across Thrust modes. I was not able to understand why thrust is in thrust mode during climb and descent because we climb or descent with a constant speed. So ...
Sourabh Jain's user avatar
0 votes
1 answer
153 views

Descent of Light attack aircraft to loiter altitude

How do Light Attack Aircraft (LAA) such as the Embraer Super Tucano descend from their cruise altitude to their loiter altitude to be on-station above ground troops? I want to know the way these ...
Pavan's user avatar
  • 461
3 votes
4 answers
820 views

What descent rate would be a "hard" landing in a Huey or similar helicopter with skids?

I would like to know what vertical descent rate a Huey or other helicopter with skids can land safely at. What would be considered a "hard" landing that would require air frame inspection? ...
tryinhard's user avatar
1 vote
1 answer
518 views

Does a VNAV PTH descent need the Forecast Descent winds?

If VNAV PTH, contrary to VNAV SPD, maintains a given path angle, depending on the CI chosen, and not a given Speed, then in my mind winds shouldn't affect it, since they would only cause the Vertical ...
Stamatis Vellis's user avatar
-5 votes
3 answers
341 views

How can I communicate an emergency de-pressurization descent to the cabin as a passenger?

Hypothetical scenario. I'm on a commercial airliner (A320) as a passenger, sitting by the wings. We are cruising at 32,000. The oxygen masks suddenly drop down and the nose pitches down heavily, ...
Cloud's user avatar
  • 13.5k
0 votes
3 answers
992 views

What rate of descent would kill you?

I was watching a video where a plane an MD-82 descended 18,000 feet per minute and crashed into a mountain. The plane was not upside down/on its side/spiraling- it had about a 5 degree pitch up the ...
MathIsLife12's user avatar
4 votes
1 answer
5k views

What is the difference between Level Change and ALT INTV during VNAV descent?

I'm confused between the two. During descent for 737 PMDG, I usually start a descent via ALT INTV, but sometimes the plane doesn't response to ALT INTV but responds to LVL Change instead. I need help ...
Billcoke's user avatar
22 votes
6 answers
8k views

Is it practical to intentionally stall an aircraft to execute a fast, controlled descent?

An MD-11 had an onboard fire, but had to request more flying distance at least partly to execute a safe descent (and to dump fuel). It ended in tragedy. In another accident, an A330 descended 30,000 ...
Abdullah is not an Amalekite's user avatar
1 vote
2 answers
439 views

Descend via STAR, after getting crossing restriction previously

The ATC issues "Cross BHAWK at FL240" initially. After few minutes, the ATC instructs "Descend Via FYTTE5 arrival". Should we comply with the crossing restriction at BHAWK, or the ...
benck's user avatar
  • 201
1 vote
2 answers
530 views

Mushing glide vs forward slip sink rate

Source: Wolfgang Langewiesche - Stick and Rudder; An Explanation of the Art of Flying I ran across a mushing glide in Wolfgang Langewiesche's - Stick and Rudder; An Explanation of the Art of Flying ...
Flion's user avatar
  • 55
2 votes
2 answers
974 views

Can the VNAV Path angle be modified in a Boeing 737 NG?

In the Boeing 737 NG series, can the usual 3 degrees Path angle used for VNAV Descent be modified through the FMC to another angle?
Stamatis Vellis's user avatar
1 vote
1 answer
945 views

What profile will a Boeing 737 NG follow after pushing the ALT INTV button?

If one uses the ALT INTV button during a Climb or Descent in the Boeing 737 NG on the MCP, what profile (Speed/Path) will the AP follow in such a climb and/or descent? Is it the same as programmed in ...
Stamatis Vellis's user avatar
18 votes
2 answers
5k views

Why does an airliner have a shallow descent when heavier, opposite to gliders with ballast?

Gliders utilize water ballast to, among other things, descend faster: But sometimes you need to get down fast: This is when water ballast is added. In airliners however, the heavier the plane, the ...
user avatar
4 votes
1 answer
579 views

Does the A320's FMC automatically adjust the rate of descent on a non-precision approach?

Does the A320's FMC automatically adjust the rate of descent on a non-precision approach? Like a back course approach for example if the distance to altitude is (or can be) programmed in?
Pete Desjardins's user avatar
2 votes
1 answer
1k views

What is the physical experience of passengers in the cabin during an Emergency Descent?

I am not a pilot so please forgive any misuse of aviation terminology; I'm merely a person who is working hard to overcome a sudden and intense fear of flying. While working through a course to ...
Umbrella_Programmer's user avatar
7 votes
2 answers
338 views

When to start descent entering a racetrack under NORDO?

Scenario: I am flying in IMC, and communications fail completely. IMC persists up until destination, where I will be conducting the following instrument approach: I am flying direct to ZUNAD from the ...
triplosete's user avatar
1 vote
1 answer
208 views

Why might an instructor in a small aircraft choose to descend with a substantial yaw on a first lesson?

Many years ago I took an introductory free (+fuel) flying lesson in a dual-control small aircraft (instructor in right seat) at a small city's municipal airport. There was a third passenger in the ...
uhoh's user avatar
  • 6,008
1 vote
1 answer
160 views

Does airspeed come into play with vertical speed, in terms of who will reach the ground first?

So let’s say there’s two aircraft, which are the same, and both are cruising at 28,000FT, the only difference is one plane is doing 260 knots and the other is doing 280 knots. If they both pitched ...
George Clooney In a Mooney's user avatar
1 vote
1 answer
165 views

Out of sight planes during final approach [duplicate]

Does it ever happen that planes descending on a descent path (glide slope) block each other so that one (or more) plane is not visible from the tower (at the airport) or localizer? I want to know if ...
Teodorism's user avatar
  • 455
4 votes
2 answers
2k views

What is the impact of thermal Anti-Ice on descent performance?

I am just another one of the passionate flight simmers trying to understand more about Anti-ice system mechanics. I am talking about the Boeing 737-800 here if it makes a difference. What bothers me ...
fafaldo's user avatar
  • 43
3 votes
1 answer
278 views

If propeller-driven planes with electric engine became the norm, would descent for landing with the engines turned off become a routine procedure?

To elaborate on the question: I know that in modern fossil fuel-driven aircraft turning the engines off during descent and/or landing approach isn't feasible for safety reasons (which makes total ...
Tom's user avatar
  • 319
9 votes
2 answers
1k views

What is the minimum altitude over Egmond aan Zee when landing at Schiphol?

I live in Egmond aan Zee which is about 36 km flight distance from Schiphol. It seems that aircraft fly over Egmond when there is a southerly wind so they can make a landing approach to Polderbaan ...
Anthony's user avatar
  • 91
1 vote
2 answers
409 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 AoA, ...
viper's user avatar
  • 21
4 votes
1 answer
369 views

When does a passenger plane leave the cruising phase?

I have Flightradar24 data here. Which are in the following structure. ...
OrgosMos's user avatar
0 votes
2 answers
2k views

What is the relationship between drag and sink rate?

I was just brushing up on basic aerodynamics and I have something I want to clarify about flying in the region of reverse command. I went up in my 172 the other day and noticed the following while ...
Patrick Spalding's user avatar
3 votes
3 answers
686 views

PA/APV Glidepath Descent and Obstacle Clearance Slope's lowest point determination

I am studying the US Terminal Instrument Procedures manual (TERPS) and as I was skimming through the guidelines about Sloping Obstacle Clearance Surface, I came across the image below from section 2-1-...
Vector Zita's user avatar
  • 1,853