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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5
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1answer
150 views

Is Cessna 150 with incorrectly marked ASI airworthy?

I've looked a bit at the CFRs trying to determine this for sure, but haven't found a clear answer.. One of the Cessna 150s that I rent from the local FBO had it's airspeed indicator swapped out four ...
0
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1answer
100 views

How do AHRS systems meet the “gyroscopic” requirement of 14 cfr 91.205.d?

EDITED Among the instruments listed as required for IFR operations in the US FAR is are various "gyroscopic" instruments, including those for the turn coordinator, attitude and heading. In ...
37
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2answers
7k views

What do pilots landing on aircraft carriers do when the ship is not visible due to weather?

Say an aircraft takes off of a carrier to do a mission somewhere, and upon returning to the carrier the pilot comes to find that a thick layer of fog has formed just above the surface of the water in ...
11
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4answers
2k views

What is 'level' to a G1000?

I used to fly a Cessna 550 with 'steam gage' mechanical gyros. The Attitude Indicator always had its flight director solidly on the horizon in level flight -- to the extent a mechanical instrument ...
4
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1answer
175 views

Artificial horizon - “horizon bar” or “symbolic airplane adjust”

(Student pilot, ~ 22hrs training) On a box-standard AI in a C172 there is a knob that allows you to move the symbolic airplane up and down. I've never managed to ask what it is for, but have now been ...
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3answers
187 views

When flying on a glide slope, does the G meter show 1G or less?

If your angle of attack in landing pattern is 14 degrees but your vertical velocity is 600 feet/minute, does the HUD show you 1G or not? Why?
3
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1answer
63 views

What's a normal response delay for a paragliding vario?

I'm a paragliding pilot with P4 licence and I've purchased a 2nd-hand FLYMASTER B1NAV flight instrument for XC flights – mainly for logging the flights (route, distance, max. speed etc). It is an ...
3
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3answers
806 views

How does a failed turn and slip indicator behave if the gyro isn't spinning at all?

I have my own theories, but I have never experienced a turn coordinator or turn and slip indicator's gyro failing first-hand. If the gyro isn't spinning, would the instrument behave like a weak ...
0
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2answers
165 views

What is the name of the Instrument that indicates roll?

What is the name of the instrument that would indicate whether the wings are level or tilted (one higher than the other) as when flying IFR? Is it the inclinometer?
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2answers
94 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 ...
3
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4answers
433 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
291 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 ...
3
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2answers
221 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 ...
2
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1answer
115 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
302 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
4
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3answers
369 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....
6
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2answers
5k 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?
1
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1answer
112 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
87 views

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.
18
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2answers
5k views

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 ?
7
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2answers
271 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?
-4
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1answer
421 views

What Are these in the PFD? [closed]

I marked them with white circles. What are they for?
7
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2answers
2k views

What is this in the primary flight Display?

What is this in the primary flight Display ?
15
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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 ...
26
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2answers
5k views

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
6
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3answers
192 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 ...
2
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5answers
406 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-...
3
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2answers
335 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?
5
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2answers
220 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
276 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 ...
7
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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?
3
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0answers
351 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
375 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
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 ...
1
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1answer
60 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 ...
0
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0answers
202 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
97 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
194 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 ...
32
votes
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....
2
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1answer
458 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
474 views

What is the difference between autopilot and autoflight?

Can you please give me some explanations about autopilot and autoflight system?
3
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1answer
627 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
158 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
327 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
400 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
445 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
400 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
214 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
626 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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