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What is the oldest part still used on the B-52 bomber?

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Spanish engineer Isaac Peral launches first electrically powered submarine.

1888

China begins the Se La Operation, its first incursion into India.

1962

Saundra Williams wins the First Miss Black America pageant.

1968

US President Ford pardons predecessor Nixon for Watergate Scandal.

1974

NASA launches OSIRIS-REx, first asteroid sample return mission.

2016

September 9 in history: Beginning of China's incursion in India, Nixon pardoned for Watergate Scandal and more

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The B-2 Spirit has a wingspan of 172 feet — wider than the fuselage of a Boeing 737 is long. It weighs up to 336,500 pounds fully loaded. It is one of the largest aircraft in the world. And yet on most radar systems, it produces a return roughly equivalent to a large seagull. The contrast between the B-2's physical reality and its electromagnetic reality is one of the most extraordinary engineering achievements of the 20th century — and almost nobody who writes about it actually describes what the aircraft looks like in person.

Why B-2 bomber shows up on radar as a bird even being 172 feet wide?

The B-2 Spirit has the highest maintenance burden of any operational aircraft in the US military. For every hour it spends in the air, it spends dozens of hours on the ground being inspected, repaired, tested, and prepared.&nbsp;

It takes 60 people to keep one B-2 flying! Who they are and what they do?

The B-2 Spirit was designed in the late 1970s and early 1980s. Its core mission computer architecture, its avionics software frameworks, and several of its fundamental systems were written in programming languages and on hardware platforms that are now decades obsolete. Updating them is not a matter of installing new software. It means recertifying every system that touches them, rewriting millions of lines of code, and retesting the entire aircraft from scratch — a process so expensive that the Air Force has repeatedly chosen to maintain legacy systems rather than modernise them.

Why B-2 bomber's core computers still run on 1980s software?

&nbsp;military aircraft are heard before they are seen. The B-2 Spirit inverts this. Witnesses at airshows and near Whiteman Air Force Base consistently describe the same experience: the aircraft appears in the sky, often before the sound catches up.

Why B-2 is almost silent on ground? Here is the engineering that makes a 153-tonne aircraft hard to hear

Every combat aircraft has a crew rescue plan. The B-2 Spirit has two problems that make its plan uniquely complicated: the crew, and the wreckage. Recovering two pilots from inside enemy-controlled territory is hard enough. The B-2 also carries classified stealth materials, classified avionics, classified weapons systems, and classified mission data that the United States cannot allow an adversary to examine. The rescue of a downed B-2 crew is an operational challenge. What happens to the aircraft itself is a strategic one.