# \#maintenance

**URL:** https://scanalyst.fourmilab.ch/tag/maintenance/1247.md

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## [B-17 Propeller Installation](https://scanalyst.fourmilab.ch/t/b-17-propeller-installation/906)

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**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\
**Replies:** 2\
**Last updated:** [14 June 2026 18:38 UTC](https://scanalyst.fourmilab.ch/t/b-17-propeller-installation/906 "2026-06-14T18:38:10Z")

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This 1944 film was produced by Boeing for the U.S. Army Air Forces to train maintenance crews in the procedure for field installation of Hamilton-Standard variable-pitch propellers on a B-17 Flying Fortress…

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## [Why Is It Climbing? Republic Airways Flight 4439](https://scanalyst.fourmilab.ch/t/why-is-it-climbing-republic-airways-flight-4439/2608)

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**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\
**Replies:** 1\
**Last updated:** [15 January 2023 22:35 UTC](https://scanalyst.fourmilab.ch/t/why-is-it-climbing-republic-airways-flight-4439/2608 "2023-01-15T22:35:19Z")

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Can you figure out what was wrong faster than the pilots on board? I’ll bet most veteran programmers would. I’ll not say more to avoid spoilers. Here is the U.S. National Transportation Safety Board dock…