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Forum: Tech Log

6th Jan 2015, 20:04

Replies: 183

A330/A340 EAD (AoA PROBES)

Views: 74,071

Posted By A33Zab

The history goes like: original flat plate...

The history goes like:

original flat plate --> (A320) XL airways accident --> Change to conical plate -->(A330) EVA incident --> Revert to flat plate per EAD--> (A321) LH incident --> ?

The...

Forum: Tech Log

12th Jan 2013, 20:48

Replies: 183

A330/A340 EAD (AoA PROBES)

Views: 74,071

Posted By A33Zab

@OK465 & CONF

From the QF72 (http://www.atsb.gov.au/media/3532398/ao2008070.pdf) (AoA spikes) final report:

Table 19: Characteristics of elevator control mechanisms

High AOA protection
Control law:...

Forum: Tech Log

12th Jan 2013, 06:27

Replies: 183

A330/A340 EAD (AoA PROBES)

Views: 74,071

Posted By A33Zab

@OK465:

I doubt that.

From an academic point of view:

When alpha protect is triggered

AP disconnect
Nz law is replaced by Hi AoA Law
Auto pitch trim is limited from entry point AoAprot. to...

Forum: Tech Log

10th Jan 2013, 03:36

Replies: 183

A330/A340 EAD (AoA PROBES)

Views: 74,071

Posted By A33Zab

The nose was low and couldn't be levelled by SS...

The nose was low and couldn't be levelled by SS aft.

Please explain to me why manual trim to full AND is required to counter alpha prot - in this case - when they wanted the nose to go up.

Forum: Tech Log

8th Jan 2013, 19:13

Replies: 183

A330/A340 EAD (AoA PROBES)

Views: 74,071

Posted By A33Zab

@Lyman:

During BUSS operation (3 ADR OFF) the flight continues in ALTERNATE (less Hi speed protection).
BUSS can be deselected by restoring 1 ADR, don't know if the Hi speed protection is also restored.
...

Forum: Tech Log

8th Jan 2013, 18:30

Replies: 183

A330/A340 EAD (AoA PROBES)

Views: 74,071

Posted By A33Zab

@Chris:

Thanks for pointing out the date, I completely missed that and thought it was new information.

Forum: Tech Log

8th Jan 2013, 16:15

Replies: 183

A330/A340 EAD (AoA PROBES)

Views: 74,071

Posted By A33Zab

Totally agree, the AFM TR should be followed! ...

Totally agree, the AFM TR should be followed!
But alleged 'total loss of pitch control' is besides the truth.

Learmount link (http://www.flightglobal.com/blogs/learmount/)

Forum: Tech Log

7th Jan 2013, 16:21

Replies: 183

A330/A340 EAD (AoA PROBES)

Views: 74,071

Posted By A33Zab

Symmetrical position of AoA vanes is very common,...

Symmetrical position of AoA vanes is very common, the longitudinal position of A33/A34 is much further aft (aft of pax door#1) than e.g. the T7 (just below the flightdeck aft window).
Airbus don't...

Forum: Tech Log

30th Dec 2012, 09:22

Replies: 183

A330/A340 EAD (AoA PROBES)

Views: 74,071

Posted By A33Zab

AoA sensor installation.

For the Thales AoA sensor to protect from ice accretion to the protruding (non heated) base.

For the Goodrich AoA sensor to protect from water ingression in outer bearing. (Perpignan accident)
...

Forum: Tech Log

29th Dec 2012, 20:03

Replies: 183

A330/A340 EAD (AoA PROBES)

Views: 74,071

Posted By A33Zab

@ Philemon:

No EVA source however:

From another topic about the subject, it was said they switched off all 3 ADR i.s.o. 2, if equipped with 'BUSS' that will display the BackUp SpeedScale and AoA pointer.
...

Forum: Tech Log

21st Dec 2012, 19:46

Replies: 183

A330/A340 EAD (AoA PROBES)

Views: 74,071

Posted By A33Zab

@GG:

That is 1 ADR to much....

'Degraded' because one will loose more than the AoA protection only in alternate.

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