Boeing 757s need new inspections after precoolers failed and overheat sensors missed it
What happened
US aviation regulators are proposing new inspections and part replacements for certain Boeing 757 airplanes. This is because some engine precoolers failed due to wear, and the sensors meant to detect overheating also failed at the same time.
Why it matters
When a critical part fails, a backup system is supposed to catch it. In this case, both the part and its backup failed, creating a hidden risk. The new rules mean airlines will have to actively check both the part and the sensor, rather than relying on the sensor to flag a problem.
The signal
Watch for how quickly airlines implement these inspections and whether similar dual failures are found in other aircraft models.