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UK CAA clears Boeing 737 MAX for return to service
28 January 2021

The UK Civil Aviation Authority (CAA) has announced on January 27 and with immediate effect that it will allow UK airlines to operate passenger flights with the Boeing 737 MAX aircraft, subject to close oversight. The ban on the aircraft operating in UK airspace will also be removed.  

The decision follows the approval of design modifications to the aircraft itself, how it is flown, and to pilot training.  This has included modification to the aircraft’s Manoeuvring Characteristics Augmentation System (MCAS) and other key safety changes aimed at preventing further accidents.

The CAA is in close contact with TUI, currently the only UK operator of the aircraft, as it returns its aircraft to service.

The removal of the airspace ban will allow foreign operators to fly the Boeing 737 MAX in UK airspace. All airlines, however, will need to go through the necessary steps to return the aircraft to service, including pilot training, so this may result in flights of the type into the UK not being seen immediately.

The main modifications to the aircraft that allow a safe return to service are:

  • Flight Control Computer (FCC) software changes, so that both of the aircraft’s Angle of Attack (AoA) sensor inputs are used by the aircraft systems (rather than previously one)
  • safeguards against MCAS activating unnecessarily, due to a failed or erroneous AoA sensor
  • removal of the MCAS repeat command
  • revised limits on the MCAS command authority
  • revisions to flight crew procedures and training requirements
  • implementation of an AoA ‘disagree’ alert indication that would appear on the pilots’ primary flight displays
  • cross FCC trim monitoring, to detect and shutdown erroneous pitch trim commands

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