Dallas, TX

Southwest Airlines has grounded 128 planes on Tuesday after it was discovered that the planes were overdue for inspection of backup hydraulic systems.

Officials with Southwest said that 80 plans will be grounded on Tuesday and the rest on Wednesday. The planes affected are all Boeing 737-700 and represents about one-fifth of the companies fleet.

Southwest released a statement on Tuesday night saying “Once identified, Southwest immediately and voluntarily removed the affected aircraft from service, initiated maintenance checks, disclosed the matter to the FAA, and developed an action plan to complete all overdue checks,”

The Federal Aviation Authority has approved a five day period where the affected planes will be allowed to fly while Southwest performs the necessary inspections.

The hydraulic systems involved are used to control the main rudder system in the event of a failure.

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