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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2answers
72 views

What is the Saint-Venant formula for calculating equivalent air speed (EAS)?

I'm studying some ground exams (for a lapsed IR). In the course notes it says that EAS (Equivalent Airspeed, i.e. a compressibility-corrected airspeed) is calculated (e.g. by an aicraft's Air Data ...
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5answers
350 views

What does the balance ball actually indicate?

Given answers and comments from a previous question, I realize that I need to clarify what the ball actually measure. I think it does not measure side slip but sideways acceleration, but I'm not quite ...
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2answers
249 views

How does sideslip indicator react during crosswind?

I will basically consider two types of sideslip indicator: the yaw string and the marble/ball inside a curved tube. I don't know the exact aeronautical term for both and I don't know if other sideslip ...
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2answers
186 views

How do I follow an ILS glideslope on the ADI in Falcon BMS?

I'm currently flying the ILS landing mission in Falcon BMS, I'm practicing landing using the instruments (head down) and although I'm mostly OK with the LOC, I struggle to maintain a 2.5 degree ...
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1answer
94 views

Why do the GS and LOC indicators blink?

So, the question is in the title. Specifically referring to this video. At around timestamp 2:10 in the video, you can see the GS and LOC indicators blink. Why does it blink?
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1answer
278 views

What is that A340 cockpit panel on the glareshield?

I want to know the panel's name and how it works. This picture is an Iberia Airbus A340-600
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3answers
365 views

Why are there two red lines on the G-meter in the MiG-29?

Why are there two red lines on the G-meter on the MiG-29 aircraft? One at 7.5G, another one is at 9G. Also on the AOA scale the red line is at only 15 degrees. That is max AOA. It looks very low to me....
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2answers
4k views

What is this instrument above the EGT in the Boeing 737?

I would like to know what is this instrument that is above the EGT of the Boeing 737. What does it indicate?
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1answer
80 views

What is the VAC indication?

I pilot the plane cessna in the simulator for a long time, and I always saw this VAC indication next to the Ammeter. What is VAC for and how to read it?
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3answers
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Is it possible to calculate lateral acceleration from pitch/yaw/roll rates?

Can you calculate an aircraft's lateral acceleration from the aircraft's yaw, pitch and roll rates? If so, how? This is to implement a digital slip indicator.
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2answers
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What do the green, white and yellow bands mean on an airspeed indicator?

what are these green and white and yellow bands in the Airspeed Indicator use for ?
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2answers
218 views

Does an instrument exist to measure the different types of drag?

Does a 'drag meter' exist that separately shows total, induced and parasite drag? If it doesn't, and in theory, would it be possible to build one?
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1answer
275 views

What Are these in the PFD? [closed]

I marked them with white circles. What are they for?
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What is this in the primary flight Display?

What is this in the primary flight Display ?
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2answers
3k views

Why does the Boeing 777X have a flight deck similar to the 787 and not to the previous 777?

Almost 3 years ago I posted this question, Why didn't the A330neo and A320neo share the cockpit of the A350?, and short answers were: "it's what the market wanted" "there is a huge ...
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2answers
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Why are the colors of the MiG-15's attitude indicator inverted?

Why are the colors of the MiG-15's attitude indicator inverted (blue on the ground side, brown on the sky side)? Source: http://www.warbirdalley.com/mig17.htm
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3answers
170 views

Is a Cessna 172S still airworthy if factory-installed instrumentation not required for day VFR flight is inoperative?

A C172S I occasionally rent had the EGT gauge placarded INOP when it had a JPI EDM-700 engine monitor installed. The placard sits on the gauge so you can no longer see the needle. Probably the single ...
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5answers
346 views

Why are primary and supportive instruments in instrument flying different depending on the phase of flight?

For example, in straight-and-level flight, the power's primary instrument is the Air Speed Indicator (ASI), and the supportive are the engine instruments. In another example, straight constant-...
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2answers
205 views

When resetting the heading indicator to match the magnetic compass, do I need to use the compass deviation card?

At least every 15 minutes we set the Heading Indicator's number to match the number of the magnetic compass. In this situation, should I consider the deviation card below the compass card or not?
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2answers
205 views

Can you turn off the instrument panel lights?

Do general aviation aircraft generally allow the turning off of the instrument panel lights? By lights I am referring to any screens, bulbs or other devices which shine a light within the cockpit.
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1answer
165 views

Is there a good resource for ACARS messages?

Is there a good place to find out all the types of data that ACARS can send and receive? I've seen high level descriptions, but I'm looking for the data that actually gets fed from or to the Flight ...
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4answers
2k views

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

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
211 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 ...
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2answers
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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 ...
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4answers
280 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 ...
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3answers
1k 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
52 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
93 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.
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0answers
94 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
157 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 ...
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11answers
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....
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1answer
351 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
351 views

What is the difference between autopilot and autoflight?

Can you please give me some explanations about autopilot and autoflight system?
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1answer
309 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 ...
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1answer
147 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
290 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 ...
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1answer
350 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
305 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, ...
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1answer
329 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/ ...
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2answers
173 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 ...
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3answers
558 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
182 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 ...
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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
43 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?
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3answers
531 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 ...
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4answers
784 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
660 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
63 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 (...
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2answers
296 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
317 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 ...

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