Airworthiness Directive · Amendment 39-18455 · Flight controls
The Boeing Company Airplanes
Superseded. A later AD replaced this one: AD 2020-20-09. Comply with the one in force.
This AD applies to all The Boeing Company Model 787-8 and 787-9 airplanes, certificated in any category.
We are adopting a new airworthiness directive (AD) for all The Boeing Company Model 787-8 and 787-9 airplanes. This AD requires revising the airplane flight manual (AFM) to instruct the flightcrew to avoid abrupt flight control inputs in response to sudden drops in airspeed, and to reinforce the need to disconnect the autopilot before making any manual flight control inputs. This AD was prompted by reports indicating that in certain weather conditions with high moisture content or possible icing, erroneous low airspeed may be displayed to the flightcrew before detection and annunciation via engine-indicating and crew-alerting system (EICAS) messages. We are issuing this AD to ensure that the flightcrew avoids abrupt pilot control inputs in response to an unrealistic, sudden drop in displayed airspeed at high actual airspeed. Abrupt pilot control inputs in this condition could exceed the structural capability of the airplane.
Within 15 days after the effective date of this AD, revise the applicable Boeing 787 AFM to add a “Non-normal Procedure” that includes the information in figure 1 to paragraph (g) of this AD. This may be done by inserting a copy of this AD into the AFM.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
