Air France crash data indicates pitot tube problems
Friday, May 27th, 2011Investigators have revealed details about the Air France crash of 2009 after finding the flight data recorders a few weeks ago. The three pilots fought the controls of the jet for 4 minutes after it stalled – initially climbing to 38000 feet (commercial jets, depending on the wind, tend to fly at around 33000 feet). The aircraft stalled, then plunged towards the ocean – a minute before the plane hit the water one of the three pilots who has been identified as the most senior, took the controls.
Too late. All 228 people aboard the Airbus SAS A330 were killed when the jet plunged into the ocean on June 1, 2009, en route to Paris fromRio.
What has emerged so far is that the pilot in command (PIC) had left the cockpit for the standard rest period. Pilots are not allowed to fly for longer than six hour stretches, and trans-Atlantic flights sometimes have 2 entire crews (pilot and co-pilot, and engineer) who exchange seats. So here is the detail from the professional pilots rumour network. Don’t be put off by the title – its the definitive zone for all those involved in aviation.

New findings
At this stage of the investigation, as an addition to the BEA interim reports of 2 July and 17 December 2009, the following new facts have been established:
ˆˆ The composition of the crew was in accordance with the operator’s procedures.
ˆˆ At the time of the event, the weight and balance of the airplane were within the operational
limits.
ˆˆ At the time of the event, the two co-pilots were seated in the cockpit and the Captain was
resting. The latter returned to the cockpit about 1 min 30 after the disengagement of the
autopilot.
ˆˆ There was an inconsistency between the speeds displayed on the left side and the integrated
standby instrument system (ISIS). This lasted for less than one minute.
ˆˆ After the autopilot disengagement:
„„the airplane climbed to 38,000 ft,
„„the stall warning was triggered and the airplane stalled,
„„the inputs made by the PF were mainly nose-up,
„„the descent lasted 3 min 30, during which the airplane remained stalled.
The angle of attack increased and remained above 35 degrees,
„„the engines were operating and always responded to crew commands.
ˆˆ The last recorded values were a pitch attitude of 16.2 degrees nose-up, a roll angle of 5.3 degrees left and a vertical speed of -10,912 ft/min.
There has been some comment about the pitot tubes which register static v active pressure differentiation. Looking at this description above, all pilots will tell you that there was a major problem with either these devices, or the system that contains the vacuum within the instrumentation.
Poor pilots had no chance if their instruments were reading incorrectly …
