Contents
Are airplanes SAE or metric?
It sure is difficult for customers and suppliers to work with Boeing drawings. To the best of my knowledge, like Derek Schatz said, Boeing uses inches, feet and gallons, and everybody else in the world who builds airplanes uses SI (metric) units, including not only Airbus but Embraer, Bombardier and COMAC.
Are all bolts metric?
3.5. International Standards Organization standards are all given in metric units, even if they apply to American products. B18. 3.5 bolts range in diameter from 1/4 inch to 3/4 inch.
Does Boeing use imperial?
Boeing like most American companies uses imperial units. Drawings are in inches.
Why do planes use feet?
Flying thousands of feet above the ground also means aircraft avoid much of the bad weather people on the ground are subjected to. Aircraft prefer life in the stratosphere, which means less turbulence.
Do planes use metric?
It might surprise a lot of pilots that for years, ICAO has recommended that the aviation world move completely to metric units (SI Units): Meters. Kilometers. Kilometers per hour.
Is Airbus A metric?
99.9% SAE. Some of the contactors (APU Start)below the 122VU and behind the OBS seat are held in with 13mm bolts. I think the faucets on some are held in with metric set screws. That could be up to airline config though.
How do I know if my bolts are standard or metric?
Telling the difference between a metric and imperial bolt is easy. If the bolt has lines on the head its standard or imperial. If the bolt has numbers on the head then its metric. These markings indicate how strong the bolt is they call this tensile strength.
What kind of steel is used in aircraft nuts?
Common materials used in aircraft nuts are hardened steel (cadmium plated carbon steel), corrosion resistant steel (CRES), stainless steel, and anodized 2024 tempered aluminum alloy.
Why are the spacing of aircraft nuts so important?
The spacing is such that a bolt pasing through a load carrying structure must push the locking section outward against the spring to engage the threads of the locking section properly. The spring then applies a constant locking effect on the bolt in the same direction of force required to tighten the nut.
Where are the majority of aircraft engines made?
The vast majority of civilian aircraftand powerplants flying worldwide are manufactured in the USA or Canada using almost exclusively Standard hardware, usually conforming to aircraft Mil Spec (MS) or AN specifications. From that perspective, the answer to your question is that any given aircraft will most likely use all Standard hardware.
Are there metric tools in an aircraft toolbox?
Most aircraft mechanics do not have any metric tools in their aviation toolboxes. There will be an exception, obviously, for those that do work on the minority of aircraft with metric hardware. Speaking from my experience of having worked at remote airports, on vintage aircraft, most toolboxes reflect the use of Standard hardware.