Noisy
← this week  ·  Subscribe →

The world is being quietly rearranged by people who write very long documents.

Federal Register · August 20, 2025
The title they went with Airworthiness Directives; Siam Hiller Holdings, Inc. Noisy translates that to

Old helicopters need new inspections for a specific part, or they can't fly

What happened
US aviation regulators are requiring new inspections for a specific part in older Siam Hiller UH-12E helicopters. If the main rotor drive shaft is not inspected for cracks, the helicopter cannot be flown or have the part installed.
Why it matters
This is a routine safety update for a specific model of older helicopter. It means operators of these aircraft must now perform a new check to ensure continued airworthiness. The change prevents a known failure point from causing accidents.
The signal
Watch for any further airworthiness directives on these specific helicopter models, which would indicate broader issues.
If you insist
Read the original →