PCDU Commentary

Freaky ADIRU Behaviour Near Perth

By Grant,on January 3rd,2009

As some of you may be aware,on October 7th 2008 a QANTAS A330 traveling from Singapore to Perth was about 154km west of Learmouth,West Australia when it entered a rapid descent,causing unsecured items &people to float up in the cabin,leading to injuries on board. The aircraft declared an emergency and diverted to Learmouth.

The ATSB has released a preliminary finding that states that a fault in one of the Air Data Inertial Reference Units (ADIRU #1) led to the incident. Investigations are continuing and QANTAS have instigated changes in their procedures should the symptoms appear again.

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Reducing the load helps smooth out the system

By Grant,on October 8th,2008

I’ve been posting some comments on a couple of stories from Dan Webb’s ‘Things in the Sky’blog. He’s noted that the transport statistics for August 2008 show the on-time arrivals improved and mishandled baggage rates reduced and that he’s looking forward to September’s figures as there should be further impact from the capacity cuts recently introduced by the airlines.

I think the improvements we’re seeing now are related to a reduction in passenger numbers (the figures didn’t show pax volumes but Dan found them somewhere else in his second post). We should see even more improvement due to the capacity cuts.

To me,the US airport system is like juggling balls. You’re doing fine with 4 balls but when you add a 5th,you start to drop one every now and again –nothing major,just the odd “ooops”moment. The problem is when you wind up juggling 8 or more balls:it’s overload and you’re dropping lots,if not all of them.

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PCDU Commentary

Freaky ADIRU Behaviour Near Perth

Reducing the load helps smooth out the system

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