The US Federal Aviation Administration (FAA) has issued a safety warning to pilots flying Boeing 787 aircraft to avoid sudden flight-control commands in case of inaccurate airspeed indications.

FAA is also expecting to make an airworthiness directive in the early part of this month urging 787-8 and 787-9 flight operators to renew the flight manual with the warning message.

Last month, Boeing issued airworthiness recommendation to 787 operators globe, and the FAA is now speeding-up to issue airworthiness directive, bypassing the usual rulemaking process to make operators embrace the change as early as possible, reports Flightglobal.

"These inaccurate low airspeed readings could cause pilots to make dangerous decisions."

FAA has alerted the cockpit crews that too much pilot input in certain circumstances can cause a safety risk because they might surpass the structural capacity of the aeroplane due to the error.

The 787 aircraft has airspeed sensors, which are three separate pieces of equipment known as pitot tubes. Due to water ingestion or simultaneous icing of two of the tubes, speed displayed can drop much below the actual speed of the plane and these inaccurate low airspeed readings could cause pilots to make dangerous decisions, reported The Wall Street Journal.

Posted on the Federal Register website, the FAA document has highlighted three cases of in-service problems with airspeed sensors. However, the document has not indicated the dates these occured or the names of carriers affected.

Meanwhile, Boeing is working to make permanent alterations to the crew alerting system, flight control system as well as air data system for dealing unsafe condition.