Pressure Switches

Editorial Staff

Wednesday, April 19, 2023 at 12:07 PM ET

Verified

Key Takeaways:

Pressure switch failures affected a diverse range of aircraft types, including Cessnas, Beechs, Diamonds, and Pilatus.
The malfunctions involved various critical systems, such as oil pressure, hydraulic pressure, fuel pressure, autofeather, and Hobbs meters.
Consequences ranged from erroneous indications and inoperative systems (e.g., landing gear, autofeather) to significant issues like engine oil loss and necessitated precautionary or unscheduled landings.
Switch failures occurred at highly variable operating times, from very low hours (e.g., 20 or 66 hours) to over 2000 hours, sometimes preceding anticipated replacement intervals or Airworthiness Directive compliance times.

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Cessna 172R Skyhawk

Broken Oil Pressure Switch

Editorial Staff