Boeing 737 MAX software issue delays certification of largest variant

A software problem affecting some Boeing 737 MAX aircraft has prompted the US Federal Aviation Administration (FAA) to delay certification of the 737 MAX 10. The regulator says it will not approve the largest member of the MAX family until it is satisfied that the issue has been resolved. It has given no revised certification date. 

The fault can arise during a go-around, when pilots abandon a landing attempt and climb away. In a particular scenario involving a change to the planned flight path, the affected software may prevent the crew from using automated vertical flight guidance. Pilots retain control of the aircraft, but the FAA says the change could increase their workload at a demanding stage of flight.

Boeing says it has informed operators and is developing a permanent software update. The FAA plans to convene a Corrective Action Review Board to assess whether the fault presents an unacceptable safety risk and whether further action is needed for aircraft already in service. The number of affected aircraft has not been established publicly.

Airline responses differ. WestJet says it has experienced no related event in service and has procedures and training to manage the situation. United Airlines says none of its current aircraft uses the affected software and that it is declining deliveries equipped with that version while the review continues. Alaska Airlines also says its aircraft do not use it.

The immediate consequence is a fresh uncertainty over the MAX 10’s entry into service. There is no announced grounding of the 737 MAX fleet, and the regulator’s review should establish whether operating procedures, a software change or other measures are required.

Source: Reuters