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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1answer
105 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
64 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
96 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
212 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
200 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
102 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
59 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
113 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
311 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
147 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
39 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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2answers
262 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
422 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 ...
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3answers
259 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 ...
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0answers
57 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
222 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
163 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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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 ...
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1answer
185 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 ...
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2answers
536 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 ...
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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 ...
29
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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 ...
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1answer
143 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.
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1answer
318 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 ...
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2answers
282 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 ...
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1answer
163 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 ...
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1answer
994 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 ...
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1answer
98 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 ...
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3answers
487 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 ...
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2answers
243 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?
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2answers
391 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?
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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
292 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); ...
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1answer
551 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 ...
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1answer
220 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 = ...
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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 ...
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1answer
320 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-...
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3answers
799 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 "...
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1answer
166 views

How was a looping possible with an Alaska Airlines plane? [duplicate]

Someone has stolen an empty airplane from Seattle Airport and crashed it down after performing some loopings. I am wondering how this was possible. (Source)
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2answers
894 views

What are the fonts used in MCDU screens?

All MCDUs (and other screens) I've seen share a very similar, if not identical, set of fonts - a monospaced, sans-serif, very clean and easily readable font, often in two vertical sizes at the same ...
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3answers
124 views

Are there (ideas for) GNSS based attitude indicators?

With upcoming GNSS systems that have better accuracy than GPS, could there be an GNSS based attitude indicator? Does maybe one already exist? I could imagine having 4 sensors (front, aft, left ...
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3answers
2k views

Are NDBs and VORs dying as a navigational method?

I am new to aviation, so bear with me on this question: I have read in multiple places that the VOR/NDB navigational aids are dying out to GPS. Is this true? Are more modern aircraft being built with ...
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1answer
180 views

What is the difference between an Instrument and Equipment?

In an aircraft, what things is an instrument and what things is an equipment? For example the ILS, is the Antennas located in the runway considered to be an instrument or an equipment? Or is there ...
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2answers
2k views

How do I determine which radial intercept angle to use?

I'm studying for the (EASA) Instrument Rating exam and I found several questions about radial intercept angles in sample exams but nothing in the books I've studied and my flight instructor doesn't ...
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4answers
722 views

Which fonts were used in old (1930s) aircraft cockpit displays and instruments?

This is probably more of a graphic design question than aviation but maybe a few hangar rats around here know the answer. What type fonts were used on the old instruments in aircraft from the 1930s ...
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1answer
357 views

How does the radio altimeter reading change with the bank angle?

How does the radio altimeter reading change with the bank angle? Following example: Let's say, we're flying at 1000' AGL and a bank angle of 0° above a endless flat surface. The radio altimeter shows ...
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2answers
159 views

What causes the inside glass of flight instruments to get hazy?

Sometimes on analog flight instruments (aka steam gauges) there is a haze or fogginess on the INSIDE of the glass that is NOT condensation. You can often find it on older aircraft with older ...
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1answer
386 views

What is this instrument that has “PACK” written on it and a temperature scale?

All I know right now is that it’s made in 1973. Another instrument I have is from a b727 and is dated 1982. This one I have no clue. Serial number- H 2590. The brand is Amphenol. That’s all the info I ...
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2answers
187 views

How to maintain your pitch when looking for other traffic in the pattern?

I am a student pilot and I fly in a desert region where turbulence often changes the pitch and airspeed of my aircraft. I am having an issue maintaining pitch while scanning for other aircraft in the ...