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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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Need help Identifying Aircraft Panels

I have the following aircraft panels which I would like to Identify and get an understanding of its value. Any help is greatly appreciated! First Panel: Length: 19 ½ in. Height: 8 in. Second Panel: ...
SDASM's user avatar
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15 votes
3 answers
6k views

Can a piece of duct tape bring down a plane today (Flight 603, 1996, Perú)?

According to Wikipedia, the reason for the crash was that: adhesive tape had been accidentally left over some or all of the static ports (on the underside of the fuselage) after the aircraft was ...
Gabriel's user avatar
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3 votes
1 answer
609 views

Do big complicated aircraft check the DI?

When I was learning to fly (on PA38s) I was taught to check the Direction Indicator against the magnetic compass every 15 minutes or so, because the DI can drift. I may not have done it that ...
DJClayworth's user avatar
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5 votes
1 answer
114 views

Does the infinite focal point in a HUD resulting from the collimation mean the HUD is ALWAYS in focus for the pilot?

I've found lots of information regarding inifinite focus/projection, and collimation with HUDs. However, I am unable to get a definitive answer to this question. I understand that the HUD is in focus ...
Ben's user avatar
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1 answer
67 views

Holding when no hold in-lieu of procedure turn present question

If I plan to do the ILS RWY 27 at Bainbridge, can I opt to hold at LYZ instead of doing the prescribed procedure turn? If so when can I descend from our en route altitude to 1900FT MSL to begin the ...
user75134's user avatar
2 votes
0 answers
102 views

What happens to ADIRU/FAC AP etc, when Pitot probes fail?

Situation: Suppose due to a bird strike pitot 1 is blocked with debris and radome is dented causing inconsistent airspeed indication between P2 and P3 (due to unequal airflow). This happens at about ...
Navoneel Karmakar's user avatar
1 vote
1 answer
87 views

Does the Attitude Indicator Face Card Move?

I'm trying to better understand how the rigidity in space principle works in relation to the attitude indicator. My understanding is a gyroscope is a spinning disc that is able to maintain orientation ...
14407's user avatar
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0 votes
1 answer
149 views

What is the name of the dotted line that shows the predicted turn radius, found on the Navigation display of the 738

What is the name for the white dotted line that stretches out from the aircraft on the navigation display, when the aircraft enters a turn? It shows the aircrafts predicted flight path.
bok1942's user avatar
0 votes
2 answers
113 views

Is there any instrument on board to assure horizontal collision avoidance?

I know that TCAS are used to get 'Traffic Alerts' as well as 'Resolution Advisories'. But an RA seems to only provide instructions to avoid vertical collisions. How about the horizontal separation, ...
Smile LiaZ's user avatar
1 vote
1 answer
692 views

What causes magnetic compass turning errors?

What exactly causes magnetic compass turning errors? I found two completely different and contrasting explanations online and I'm confused as to which one is correct. Explanation 1: Reference: ...
Katrina's user avatar
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2 votes
2 answers
489 views

What causes magnetic compass acceleration errors?

I was trying to find out what exactly causes magnetic compass acceleration errors, and I found two completely different and contrasting explanations online (both are supported by an equal amount of ...
Katrina's user avatar
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2 votes
2 answers
115 views

If the RPM of the Gyro is increased due to high Vacuum Pressure. Will it increase rigidity and resist precession?

If the RPM of the GYRO of the Attitude Indicator or Heading Indicator is increased due to high vacuum pressure. Will it increase rigidity in space and resist any force applied and it will not precess? ...
Nish's user avatar
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1 answer
128 views

What is meant by a Gimbal Lock and what are the limits of a Heading Indicator and Attitude Indicator? [duplicate]

When we perform a spin in a Cessna 172, I have seen that the Attitude Indicator gets messed up and locks itself into a disoriented reading for sometime. I have read that this usually happens when ...
Nish's user avatar
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2 votes
2 answers
160 views

Half-Standard Rate Turns and Turn Coordinator

What does a half-standard rate turn look like on a typical turn coordinator? Is the wing tip exactly between the "wings level" mark and the standard rate mark? I am not asking about turn-and-...
Terry's user avatar
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1 answer
417 views

Static port and drain hole blocked with pitot tube unobstructed

In this situation, would pitot-static instrumentation behave as if only the static port was blocked? What about if only the drain hole becomes blocked? Thank you
Terry's user avatar
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1 answer
174 views

Is the pitch an attitude indicator displays in relation to the ground, or is it in relation to the current aircraft bank?

In the old analog, vacuum powered attitude indicators, does the displayed pitch axis indicate the pitch in relation to the current bank angle, or in relation to the ground (true level)? To put it ...
Azendale's user avatar
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4 votes
1 answer
71 views

Why was the rate of part 121 LPV equipage projected to be so low, and has that projection come true?

On page 10 of the FAA's 2016 PBN Navigation Strategy document, found here, the USA part 121 fleet is very thoroughly equipped with RNAV capability....except for LPV. Similarly, the FAA predicted that ...
Steve V.'s user avatar
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12 votes
4 answers
4k views

Why do most light aircraft not have AoA indicators?

Why is an angle of attack indicator not commonly included on small airplanes? Is it too expensive?
Someone's user avatar
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8 votes
3 answers
3k views

Why does a sudden tailwind/headwind change IAS?

I read the following statement: “tailwind quickly changing to a headwind causes an increase in airspeed and performance. Conversely, a headwind changing to a tailwind causes a decrease in airspeed and ...
Breaach's user avatar
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2 votes
2 answers
428 views

Understanding how Attitude Indicator works?

Hi guys. The only doubt I have is if the roll and pitch gimbals shown on the top rotate or remain rigid in space holding the gyro when the airplane is pitched and/or banked. I think that they remain ...
Breaach's user avatar
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0 votes
1 answer
280 views

When does true airspeed equal indicated airspeed?

When would the TAS=IAS/CAS? When at sea level, pressure 29.92, and 15 degrees of temperature? What other realistic scenario both of these airspeeds are equal? Because it would be extremely rare to at ...
Breaach's user avatar
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0 votes
1 answer
436 views

When does true altitude equal indicated altitude?

Under what conditions is true altitude is equal to indicated altitude? When the sea level pressure is 29.92 in Hg and the temperature is standard for a given altitude, for example 9 degrees at 3000 ft?...
Breaach's user avatar
  • 159
4 votes
1 answer
376 views

"In the turn coordinator, the gyro is canted 30 degrees from the horizontal so it responds to roll as well as yaw"

According to Wikipedia, "In the turn coordinator, the gyro is canted 30 degrees from the horizontal, so it responds to roll as well as yaw." I don't understand this point. How does rotating ...
marshmellow's user avatar
-1 votes
1 answer
327 views

The instrument that show the attitude in the F-16 cockpit in a dive glide slope but nose up attitude what will show? [closed]

An F-16 Fighting Falcon is nose up at 25 degrees angle of attack (AoA) and unable to keep the level flight path but it is in a $600$ feet per minute dive slope. Does the attitude direction indicator (...
George Geo's user avatar
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1 vote
2 answers
180 views

What is this instrument and what is it for?

Can anyone identify this instrument?
Charles Bretana's user avatar
3 votes
1 answer
260 views

Manual or other information regarding Kollsman Instruments B40331-10-276 altimeter

I just purchased a used altimeter from eBay because it'll look pretty on a shelf, and I may add a computer interface to it. However, I need help finding information on it. This (from what I've been ...
Steve's user avatar
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5 votes
2 answers
1k views

Why aren't PFDs made as robust as the Integrated Standby Instrument System (ISIS)?

The integrated standby instrument system (ISIS) is a standby instrument used in many large airliners that provides airspeed, altitude, and attitude information to the pilot in the case of electrical ...
Boeing787's user avatar
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4 votes
3 answers
3k views

What are Baro-Aiding and Baro-VNAV systems?

I've tried searching online as to what the architecture of these systems look like, and I can't seem to find any hardware information. And if it's not a hardware but instead a software, which software ...
RattMuscle's user avatar
13 votes
3 answers
3k views

Should turns always be standard-rate?

I know that the turn coordinator has markings that allow you to turn at a particular rate, so you can use the TC and a clock or stopwatch to turn a particular number of degrees. Are you always ...
Someone's user avatar
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11 votes
2 answers
2k views

At what point is the input data to glass cockpit PFDs converted to digital?

At a very basic level, primary flight displays take data from sensors, do calculations, and display the results on a screen. Of course, because they are digital computers, the input must be digital, ...
Someone's user avatar
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2 votes
1 answer
440 views

Suction gauge pressure too high

What will happen to the gyroscopic instruments (heading indicator and attitude indicator) if the vacuum pressure is too high? Will they be sensitive or stable?
AerospaceX's user avatar
14 votes
2 answers
5k views

What should I follow, if two altimeters show different altitudes?

My school airplane has a Garmin G5 Electronic Flight Instrument and round gauge altimeter, but they have almost 50ft differential. The G5 shows 50 feet higher on the same altimeter setting. So in IFR, ...
윤상우's user avatar
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1 vote
0 answers
377 views

What is the origin of the ‘six pack’ flight instrument arrangement?

I was wondering who came up with the modern ‘six pack’ flight instrument arrangement, when I realized that the old British blind instrument flying panel that was the standard across many airplane ...
B. Kellh's user avatar
2 votes
2 answers
97 views

Terminology for roller counter mechanism components

I have here a Doppler drift and groundspeed indicator - I believe from a Decca Type 72 Doppler radar installation. It uses a servo-driven needle to display drift angle, and a roller counter to display ...
Jack Deeth's user avatar
0 votes
3 answers
712 views

Is the attitude gyro (artificial horizon) equipment on our DA40NG aircraft powered by electricity?

Is the attitude gyro (artificial horizon) equipment on our DA40NG aircraft powered by electricity? While reading the flight manual of the plane, I saw an article about the emergency switch: "by ...
pilot162's user avatar
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5 votes
3 answers
478 views

What is the name for the spherical type of attitude indicator that also shows heading?

Is there a special name for the type of attitude indicator or artificial horizon that is more or less a complete sphere and includes lines to show the aircraft heading? I've seen them in the cockpits ...
quiet flyer's user avatar
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23 votes
2 answers
4k views

How was altitude calculated before the invention of the altimeter?

I just read David McCollough's "The Wright Brothers," and was surprised to find several references to the exact altitude attained by various Wright airplanes. For example, on page 235: The ...
nuggethead's user avatar
-1 votes
1 answer
121 views

FMC and MCDU not talking

I have a test bed in which the FMC and MCDU are hooked up to one another. FMC menu was populated on MCDU and was able to be navigated. After making some changes to the FMC GPS #2 lines, the FMC ...
Ace's user avatar
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2 votes
2 answers
283 views

How to accurately test glide ratio in given configuration?

How can glide ratio be accurately measured with typical GA airplane instruments in real conditions? What, if any, specialty instruments are used for professional glide ratio testing (such as a ...
Max Power's user avatar
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16 votes
1 answer
3k views

What is this instrument for on the 747 flight engineer's panel?

Above the flight engineer's panel in a 747-100 there is an instrument that looks like a curved spirit level. What was it used for? source
Party Ark's user avatar
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1 vote
1 answer
265 views

What does the AHRS do in the Garmin 175 series?

What function does the AHRS perform in the Garmin 175 series? And how long should it take to perform the initialization of the AHRS component in the initial system configuration process? I am just ...
Charles Bretana's user avatar
2 votes
0 answers
335 views

Air density factor when calculating Airspeed

I am making my own attitude indicator / AHRS, like a Garmin G5. I am using two pressure sensors to measure altitude & airspeed via static /pitot lines. Now I know the formula for calculating ...
DMP52's user avatar
  • 21
9 votes
1 answer
434 views

Why is this Cessna flap position indicator marked so irregularly?

Look at this flap position indicator as found on Cessna 310 models: (source: eBay) I would have expected it to be marked at 5° intervals, but it is marked irregularly instead (apart from the "...
TheEagle's user avatar
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1 vote
1 answer
247 views

Where can a digital reading of the pitch/attitude of a plane be found?

Where can a digital reading of the pitch of plane be found? E.g on Microsoft flight simulator, on the attitude dial, the pitch of the plane (e.g 10 degrees up above horizon) has to be manually read ...
TastyB's user avatar
  • 11
0 votes
1 answer
373 views

Difficulties of landing an airliner without instruments

I just heard the communications from an Embraer E170 that lost all instruments after takeoff and had to return to the airport. Brickyard E170 Can someone explain the procedure from the pilot's ...
SDH's user avatar
  • 650
7 votes
2 answers
4k views

Does baro altitude from ADSB represent height above ground level or height above mean sea level?

I am retrieving ADSB data from Opensky-network.org. I would like to know what the baro altitude represents, is it the height above ground level or above mean sea level ?
Canis_Lupas's user avatar
2 votes
2 answers
339 views

Requirements for Logging practice Instrument approaches, (and holdings, and course interceptions) while in VMC

Does anyone know the FAA rational for requiring the second pilot on board to have access to a complete Fully functioning set of flight controls in order to act as safety observer for the purpose of ...
Charles Bretana's user avatar
10 votes
1 answer
1k views

Why wouldn't the angle markings on an attitude indicator match the horizon line?

This is a video of some guys messing around in a 737 simulator. Starting at about 1:13, when they have the plane in a pretty deep stall, the attitude indicator degree markings no longer line up with ...
HiddenWindshield's user avatar
4 votes
1 answer
553 views

What is the difference between the two fields on the bottom half of the upper ECAM display on Airbus airplanes?

Note the two fields with green text on the bottom half of the display, separated by a white line. During abnormal conditions, the left portion may show "ECAM actions," but I do not know what ...
Charles Nicholson's user avatar
0 votes
3 answers
4k views

What do ENR,TERM and APR mean in the HSI? Also how may I call this part on the HSI?

How should I answer when my instructor asks me what it means during the flight? I searched but couldn't find a definitive answer.
pilot162's user avatar
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