The Titanic effect (Part II)

07/08/2011 — Leave a comment

What the engineers at Airbus and Harland & Wolff have in common

Thinking about the unintentional and contra-indicating stall warning signal of AF 447 I was struck by the common theme between the AF 447 crash and the Titanic’s sinking. In both we see a system being operated in a way unanticipated by the designers, with this unanticipated operation subverting their design’s safety barriers.

In the case of the Titanic it was the decision by the OOW to put the helm hard over that negated the watertight subdivisions of Harland and Wolff that were predicated on a head on collision. In the case of AF 447 it was the aircrews flight into a deep stall with it’s low forward air speed that negated the stall warning protection.

In neither case were these implicit assumption about how the system should be operated clearly communicated from the designers to the operators. As a result the operators had no idea that their actions would have the consequences that they did. Had these assumptions been made visible one can imagine the interesting discussion that might have ensued.

No Comments

Be the first to start the conversation!

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s