One captain called the flight manual 'inadequate and almost criminally insufficient'.

The company insists that full instructions could be found in the flight manual and some pilots say that a skilled pilot would have been able to switch it off anyway.

Accident report notes that the flight manual did not sufficiently highlight the unusual stall characteristics.

These civil agencies are concerned with the aircrafts safety and that the pilots flight manual accurately reports the aircrafts performance.

Aircraft manufacturers use the aircraft flight manual to publish details of the error in indicated airspeed and indicated altitude across the operating range of speeds.