Questions tagged [flight-instruments]

Flight instruments provide the pilot with information about the flight situation of that aircraft, such as altitude, speed and direction; and are of particular use in conditions of poor visibility, such as in clouds, when such information is not available from visual reference outside the aircraft.

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6
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3answers
2k views

If you were to fly an ILS in a knife edge would you receve GS and LOC be fliped?

because LOC and GS work the same way, if you were to fly one at 90 degrees bank would your information be displayed on the wrong indicators?
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0answers
95 views

Is it illegal to fly a Cessna 172S under day VFR with an inoperative vacuum gauge?

Let's say my vacuum gauge is not working on my C172S and I want to go day VFR flying. There is no MEL. 14 CFR 91.213 details procedures for inoperative instruments, and I think the following ...
28
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2answers
4k views

What is the purpose of the Dash 8’s “TOUCHED RUNWAY” warning light?

The DHC-8-400 (and possibly other DHC-8 variants) has (or, at least, had in late 2007, according to Appendix G of this AAR) a warning light labelled “TOUCHED RUNWAY”. The extract of the DHC-8-400’s ...
4
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4answers
156 views

Is Turn and slip indicator a good back-up for the attitude indicator?

I was reading my Aircraft general knowledge book, and noticed something peculiar that was written. The book described that the turn and slip indicator works as a back-up in case of a malfunctioning ...
7
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3answers
701 views

Why does a turn and slip indicator matter?

I'm studying the principles of flight, and I'm having some unanswered questions in my mind regarding the turn and slip indicator. I'm reading that a turn and slip indicator displays the slip or skid ...
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1answer
37 views

Formula for calculating turn indicator (deviation from coordination)

being more a professional programmer and less prof pilot, I am building a small Android EFIS and I'm able to calculate quaternions, yaw, pitch, roll, TAS, acceleration values etc. I am stuck ...
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0answers
50 views

What is the maximum permissible error of Vertical Speed Indicator for General Aviation flight operations according to FAA?

I know that if VSI shows +100 during preflight cockpit check that can be considered as 0 and flight can be conducted based on that but what is the max error permissible for VSI usage.
3
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0answers
89 views

Why was the Tu-104 so prone to navball-disabling electrical power failures?

Of the (rather numerous) accidents involving the Tu-104, several were either caused or aggravated by major electrical failures, which disabled the aircraft's navballs, which caused the pilots to ...
3
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1answer
106 views

Which instruments are assigned to Pilot Flying and Pilot Not Flying in the various flight stages?

Is there a document which highlights the responsibilities of the Pilot Flying and the Pilot Not Flying? Specifically, I want to find out what instruments are assigned to whom in all the stages of ...
30
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10answers
10k views

How could “aggressor” pilots fly foreign aircraft without speaking the language?

Context I watched a couple documentaries recently and found one where they were mentioning the training of American forces against Mi-24 that were captured and brought back to the US to test fly them....
2
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1answer
150 views

How does a flux gate compass system work?

I have heard of gyroscopes and AHRS being used for heading indication, but I haven't heard of a flux gate compass system until recently. What are the principles of its operation and what types of ...
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1answer
199 views

What is the difference between autopilot and autoflight?

Can you please give me some explanations about autopilot and autoflight system?
2
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1answer
96 views

What Makes G1000 NXi Different From G1000?

The new displays are installed on the brand new Cessna aircraft and upgrade plans are ready. But what is the difference from the G1000 that was there from the early 2000s? Is the tablet/phone ...
3
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1answer
106 views

How do altimeters cope with varying lapse rate?

How do barometric altimeters measure altitude above atmosphere datum if the laps rate of the pressure is not uniform, not constant? Imagine these lines representing pressure lapse rate: ...
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4answers
229 views

Does temperature affect dynamic pressure?

Taking off on a cold day (5°C), it can take 10 seconds to reach rotation speed but on a hot day (40°C) degrees it will take longer to reach the same speed. Is this due to the dynamic pressure? How ...
3
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1answer
267 views

How does an airspeed indicator look from the inside?

How does a typical GA airspeed indicator look from the inside and how does it work?
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2answers
141 views

How does the aneroid wafer expands? (ASI) [duplicate]

So, how does it expand? (aneroid wafer - intend to the airspeed indicator) I have two “theories” (from what I’ve learned) which are : The ram air entering through the pitot tube physically hitting, ...
1
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1answer
166 views

Question about CDI/OBS and HI [duplicate]

Could somebody please explain me the differences between using the OBS and the Heading Indicator? As much as I could understand, once you tune into the VOR, the OBS starts to show how much deflection/ ...
-1
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2answers
125 views

May turn rate indicators (and turn coordinators) be calibrated to be accurate at all airspeeds, or only for one?

2 related questions: may a turn rate indicator be calibrated to be accurate at all airspeeds, or only for one? Likewise for a turn "coordinator". The meaning of "accurate" intended in this question ...
4
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3answers
383 views

Why are Vertical tails generally tapered?

I'm just intrigued to know why the vertical tail of a majority of aircraft is tapered? Is it due to aerodynamics, structural design or due to some instrumentation or multiple other reasons?
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2answers
161 views

Can a Skylane fly without electricity?

Some Hobbs Meters uses master electricity switch to keep the track of time. So what If an cheapskate Skylane pilot wants to fly without electricity to lessen rent? Which main six instruments would ...
28
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4answers
5k views

Is it normal for gliders not to have attitude indicators?

This answer shows a picture of and describes a "modern" glider instrument panel, with two variometers, airspeed indicator, altimeter, compass, temperature gauge and radio controls. Notably (at least ...
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0answers
42 views

Are there any softwares that can integrate with desktop sims that accurately simulate third party EFIS retrofits?

So, are there any softwares out there that can integrate into desktop simulators, that can accurately emulate third party EFIS instruments for example, Dynon EFIS or Aspen Avionics Evolution?
2
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3answers
381 views

How useful are the AOA Indexers and indicators for jet pilots and civillians?

I dont see them neccessary unless you are landing on a aircraft carrier. I just don't know a lot about them. I understand what they do but they just dont seem neccessary unless you are landing a jet ...
6
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4answers
552 views

Why do aircraft stall warning systems use angle-of-attack vanes rather than detecting airflow separation directly?

Stall warning and protection systems on essentially all aircraft work by using several hinged vanes on the side of the fuselage (usually at least three, and preferably more), which align themselves ...
2
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3answers
430 views

Are magnetic turning errors due to the southern side of the compass being weighted?

When I was in college, I had an instructor who taught me that the turning errors in a magnetic compass were due to a counter-weight installed on the south side of the compass that was intended to ...
3
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0answers
59 views

Is it possible to selectively deactivate alarms? [duplicate]

My question is restricted to Airbus an Boeing's best sellers, namely the A320 and the B737. If relevant, answer can be extended to other types. In those aircraft, there are multiple possible alarms (...
5
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2answers
243 views

Why would a C150 tachometer be sluggish?

After having an issue with a tachometer bouncing so much that it fell off, I now have the opposite problem with the replacement (Mitchell D1-112-5025): The tachometer is sluggish. When I open the ...
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1answer
226 views

What is the relation between altitude and vertical speed?

I recently saw 2 graphs on a flight path on BBC, shown below. For those interested, it's the path of the recently crashed Boeing 737 max flight ET302, but that's irrelevant to my question. My ...
5
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2answers
1k views

What is the blue range indicating on this manifold pressure gauge?

This is baffling me. Does anybody with experience with this type of indicator have any idea what the blue range of this gauge means? It's mounted in a mock-up panel. I know nothing about where it ...
2
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1answer
201 views

Why don't all pilots receive at least basic instrument training?

Given the frequency with which non-instrument-rated pilots get themselves killed attempting to continue VFR flights into instrument conditions, why don't all pilots receive at least basic instrument ...
5
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2answers
866 views

Can a private pilot placard an inoperative instrument?

For certificated small aircraft that are not required to have a minimum equipment list. If you have an instrument break while on a cross country flight and it is not a legally required instrument for ...
25
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6answers
6k views

Why would a C150 tachometer bounce so much that the needle fell off?

On a long flight in a C150E, the tachometer started bouncing a little bit and the severity of the bouncing gradually increased until it was extreme: The tachometer was spinning in loops and making a ...
30
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3answers
8k views

What is this object in the cockpit of an ultralight?

This is a tool (probably) in on an ultralight airplane. Initially I guessed that it is a tilting meter (to level between right and left), but seems it is not as it just a vertical tube filled up with ...
3
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1answer
186 views

Does the glide slope flag detect percent of modulation (80%)?

Please advise if the glideslope flag validates that the received frequency is being modulated at nominal 80% or 40% for a localizer.
1
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1answer
395 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 ...
1
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2answers
342 views

How do aircraft stall warning systems handle (or not) asymmetric-stall situations?

Most, if not all, new airplanes are required to have stall warning systems to (as the name should make clear) provide the pilots with a warning when the airplane is about to stall. Most stall warning ...
2
votes
1answer
177 views

What are these engine gauges in the Comet 4 for?

What are these gauges on the Comet 4's engine-gauge panel (between the captain's and first officer's instruments, above the throttle levers), marked "POWER LOSS INDICATOR", for? (Sorry for the blurry ...
7
votes
1answer
998 views

Is there a type of instrument/display that guides pilots along a certain path?

What do you call an instrument that can help a pilot fly along a predetermined flight path (e.g. path thru GPS coordinates), showing them when they stray a little so they can correct? Not a control ...
0
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1answer
166 views

How does turning Errors in the Air Driven Artificial Horizon work?

Turning through 90°, 180°, 270° & 360°, the error is different. I can understand what is turning error and pitch error individually. But why turning through different degree, the resulting error ...
5
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3answers
679 views

What’s the setting range altimeters can handle?

What’s the setting range altimeters can handle? Is there a standard requiring a certain range for aircraft to be certified? Are there many occasions where a QNH is so high or low that airplanes have ...
0
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2answers
326 views

What is the most effective way for a VFR pilot to scan the instruments during manoeuvres?

May I ask your opinion on what is the best and most effective pattern for a VFR pilot to scan their instruments during manoeuvres?
3
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2answers
467 views

Why does the turn coordinator ball move to the right during a climb?

In a light aircraft like a C172 or PA-28, during a climb the ball in the turn coordinator moves to the right. Why?
25
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1answer
3k views

Identification of this control panel for a four-engine plane

While cataloguing a printer's copper plates I came across a control panel image, and I have attached it here in the hope someone can identify what plane it's from. The Lorenz blind-landing instrument ...
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3answers
331 views

Do any aircraft have a “self-contained ILS”?

The ILS is an invaluable aid to pilots, especially those operating to/from the many airports where poor weather is common (low-visibility operations would be completely impossible without an ILS); ...
3
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1answer
659 views

What happens to manifold pressure reading following a reduction in both throttle and RPM?

This was one of the questions in my online ground school quiz (PPL), detail as follows: To set climb power, you reduce the throttle (manifold pressure) and then the props (RPM lever). After setting ...
6
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1answer
223 views

Why are airspeed gauges labeled above Vne?

Examples: Cessna 150L Vne = 141 knots (162 MPH), gauge labeled to 170 knots. It looks like there's room to extend the scale to 180. Cessna 152 Vne = 149 KIAS, gauge labeled to 170. Cessna 172R Vne = ...
6
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2answers
2k views

How to navigate an aircraft without GPS? [duplicate]

In case of loss of GPS: how can an aircraft not only be navigated but navigated so precisely that it can pinpoint its destination airport ? (case in point: Finland and Norway are telling airline ...
2
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1answer
338 views

Lindbergh's panel— Ryan NYP— what is this instrument and how was it useful?

Lindbergh's panel-- Ryan NYP-- what is this instrument and how was it used? See this link-- it should allow you to zoom in by mousing around https://www.amazon.com/Instrument-Successfully-Atlantic-...
11
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3answers
847 views

During “partial panel” flying, in what ways is a turn rate indicator more useful than a turn coordinator?

This question deals with flying by reference to old-fashioned "steam gauges", not a modern "glass cockpit". I recall hearing some pilots very experienced (ATP) pilots advocate for the older-style "...