Originally Posted by
Loose rivets
That would be a newspaper that probably got its data from hear. Possibly. Allegedly.
No. That was a direct quote from the head of Indonesia’s National Transportation Safety Committee, and was reported by numerous other news organizations. I’m sure you can find the press conferece taped online somewhere ass well.
I get the feeling the Airspeed indications were fine according to one log analysis.
Also, no. Look closer. There is a slight offset between the pilot and co-pilot’s computed airspeed. Refer to page 7 of the report, the traces labeled “COMPUTEDAIRSPEEEDLFDR” and “RFDR”
http://avherald.com/files/lionair_b3..._knkt_data.pdf
This is one of the expected and published effects of a bad AOA sensor on a 737. The ADIRU uses the angle of attack as one of the inputs to correct the raw indicated airspeed (as directly sensed at the pitot and static ports) for installation and position error, so that it can be used as computed airspeed and dislayed on the PFD.
The pilot and co-pilot’s air data systems and indications are independent. The computed airspeeds are monitored. If there is more than a certain difference beteen the pilot and co-pilot’s airspeed, and you will get the “IAS DISAGREE” message on the PFD. Which is what the head of the KNKT says occured on at least four different flights of this aircraft.