[SystemSafety] QF 32 and the Airbus A380

[Matthew Squair]

Hi all,

Just to add that in the A380, as in earlier Airbus aircraft, fuel is used
to control CoG via a trim tank in the tail. The objective is to increase
fuel efficiency.

However you do end up with an in flight longitudinal CoG that's 'unsafe'
for landing so you can either burn it, transfer it or dump it prior to
making an emergency landing.

All the above does require a working fuel transfer system, something QF32
obviously did not have. And does raise the question of whether trimming in
flight with fuel makes the fuel transfer system a critical flight control
system?

If your interested here's my tally of system damage on QF32 compiled from
contemporaneous sources.

http://msquair.wordpress.com/2010/11/06/qantas-flight-qf32-and-common-cause/

Matthew Squair

Sent from iPhone

On 29/09/2012, at 6:31 AM, Bernd Sieker <sieker at causalis.com> wrote:

On 28.09.2012 16:06, michael.lemay at aero.bombardier.com wrote:


I've had some experience doing loads and dynamics on transport-category

aircraft, so maybe I can provide some insight.


Thank you, Michael, that was very interesting.


On 26.09.12 10:37, Bernd Sieker wrote:


> All transport category aircraft have to be designed for the same load

> factors. These are +2.5 G and -1 G with high-lift devices retracted

> ("clean"), and +2.0 and 0 with flaps/slats extended (design limit load).


Some references for that: CS 25.337 and CS 25.345, respectively.


CS 25: Certification Specifications for transport category aeroplanes,

found at


http://www.easa.europa.eu/agency-measures/docs/certification-specifications/CS-25/CS-25%20Amdt%2012.pdf


AMC 25.307 specifies that structures need be shown to support limit load

with detrimental permanent deformations, and ultimate load (usually 1.5


sorry, that should obviously be "without detrimental permanent
deformations".

times limit load, CS 25.303) without failure.


AMC 25: Acceptable Means of Compliance, Book 2 of CS 25, which specifies

some acceptable means, but not the only possible ones, of showing

compliance with the specifiations in CS 25 (Book 1).



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