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Questions tagged [gauge]

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29 votes
2 answers
6k views

Can instruments be fixed via a swift punch?

I remember reading a book about private piloting techniques, (I can't remember the title; it has been so long; perhaps I can check my library history or something to see later), and I saw something ...
Bassinator's user avatar
  • 5,490
28 votes
1 answer
5k views

Why does the B-29 have eight oil needles?

In the image above, quiet flyer and I realized that there are 2 needles in every oil gauge, and there are 4 oil gauges. Well, why in the world are there 8 needles in total? And the optimal range arcs ...
Ginger's user avatar
  • 1,167
23 votes
4 answers
27k views

Why not have Pitot Heat always on?

Most (all?) aircraft have a Pitot Heat Switch which must be turned on in certain conditions. Seems Pitot Heat is one of those things you don't want to forget to switch on when it's needed, or worse, ...
SnakeDoc's user avatar
  • 2,438
19 votes
1 answer
3k views

What do these instruments do?

This is sort of the reverse of an aircraft-identifcation question. I am attempting to build a virtual model of a Gee Bee R1 (for fun). Unfortunately I haven't had much luck finding plans or images of ...
gandalf3's user avatar
  • 293
19 votes
1 answer
4k views

What aircraft is this compass from?

I have come into possession of some of my grandfather's things including some aircraft parts that he had. He was a naval pilot who flew single-engine fighters in WW2 and then at some point ...
jesse_b's user avatar
  • 325
18 votes
2 answers
6k views

How accurate must fuel gauges be for VFR flight?

All Private Pilots should know the acronym TOMATO FLAMES for the Minimum Equipment List (MEL). On that list, F means Fuel Gauges.But what exactly is required of fuel gauges? Yesterday, my rental ...
abelenky's user avatar
  • 30.7k
13 votes
2 answers
3k views

Where does the altimeter measure from?

During the landing flare, the cockpit can sometimes be twenty/thirty feet or more above the rear landing gear, especially with larger aircraft. (source: valkaviation.com) In some aircraft, you can ...
SnakeDoc's user avatar
  • 2,438
12 votes
2 answers
3k views

What does the small needle + scale on this turboprop's N1 gauges indicate?

Look at these weird turboprop N1 gauges: I'm referring to the smaller needle at the top of each PERCENT RPM labelled N1 gauge. What does it display ? I have no ...
TheEagle's user avatar
  • 1,394
10 votes
1 answer
375 views

Why does the X-3 have two oil pressure gauges per engine?

The X-3, as currently in the National Museum of the US Air Force, has two oil pressure gauges per engine, and one fuel pressure gauge per engine. One of the per-engine oil pressure gauges is labeled ...
tml's user avatar
  • 756
9 votes
2 answers
3k views

What kind of gauge is this?

I acquired a small number of vintage (WWII era) aviation gauges. The others I have been able to successfully identify, but this one is a bit of an odd duck. It is marked Kollsman Type C-14, Part No. ...
Eddie Noland's user avatar
9 votes
1 answer
433 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
  • 1,394
8 votes
2 answers
5k views

Why doesn't the 737 MAX have an APU EGT gauge like all other 737s do?

On Original, Classic, and Next Generation 737s, the APU panel has an EGT (exhaust-gas temperature) gauge below the four APU caution/warning lights (all images in this question are from the 737 ...
Vikki's user avatar
  • 28.4k
5 votes
1 answer
911 views

Why does the 737 Original have an explicit hydraulic-quantity indicator for only the A hydraulic system?

The 737 (Original, Classic, NG, and MAX) has two primary hydraulic systems (A and B),1 which provide power to the aircraft’s flight controls and other aircraft components (like the wheelbrakes, ...
Vikki's user avatar
  • 28.4k
3 votes
1 answer
229 views

What aircraft is this clock from?

I have come into possession of some of my grandfathers things including some aircraft parts that he had. He was a naval pilot who flew single engine fighters in WW2 and then at some point transitioned ...
jesse_b's user avatar
  • 325
3 votes
1 answer
504 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 ...
Vikki's user avatar
  • 28.4k
3 votes
1 answer
175 views

Early "digital" rotating digit wheel type gauges

The XB-70 has a "digital" gauge showing the total fuel quantity using six rotating digit wheels (as in mechanical counters, odometers etc), and another showing the fuel quantity in the tank ...
tml's user avatar
  • 756
3 votes
3 answers
2k views

Are steam gauges more reliable than glass panels?

I have always had a deep appreciation for technology and the future and I encourage that technology should move us forward whether that be in aviation terms or otherwise but one question has been on ...
Lee Stewart's user avatar
3 votes
0 answers
150 views

What kind of low pressure causes abnormal RPM variations?

I was wondering what kind of low pressure indication causes abnormal variations in the RPM of a Lockheed L188 Electra. I was told one of the engines was presenting low pressure readings at certain ...
Electra's user avatar
  • 345
2 votes
1 answer
216 views

WWII fuel gauge: single needle and dual range

In T-34 movie there is a scene where a WWII small aircraft is flying: and the pilot warnings the official that they're running out of fuel and a quick close up of the cockpit shows the fuel gauge: ...
Mark's user avatar
  • 293
2 votes
1 answer
1k views

Still using knots, nautical miles, inches of Hg. Is that impossible to switch to SI units? [duplicate]

Why doesn't the aviation industry use SI units?. I believe only a few countries use meters and other SI units in air transportation, including India and China (please correct if wrong). Using kts ...
mins's user avatar
  • 74.7k