PPRuNe Forums - View Single Post - AF 447 Thread No. 7
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Old 26th Feb 2012, 21:36
  #758 (permalink)  
RR_NDB
 
Join Date: Feb 2011
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...you have to lower the flaps a little bit

Hi,

A33Zab

Well, nothing to do with a software bug...
The context of my post was Testability, maintainability, etc.

Once a day (Flight Phase 9 = after landing) the wing tip brakes are automatically checked, if test fails to initialize for 10 days, this test should be performed by maintenance through MCDU.

When -incorrectly- setting the clock date (manual) you would go beyond those 10 days and trigger the FLAP TIP BRK FAULT and SLAT TIP BRK FAULT messages.
To reset these situation you have to reset the system through CMS AND cycle flaps opposite to the direction when it locked up.
If F/S are in the full up position you only have one way (=DOWN) to go for automatic reset. (and manual reset of the devices becomes necessary when a F/S Up command is required)

To prevent this situation you would lower the F/S a little bit so you can reset (by MCDU) in both directions.

With the GPS clock setting option this would not bring one into this trouble.
Fine biz! Some friends also will benefit from your explanation.

Rgds,
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