CL60 D-AAAY uncommanded flap extension - AAIB initial report

[FYG001]

I find incident/accident report always highly interesting (and sobering). They often give a unique insight in the machine, the way it is operated, the HMI, the procedures etc etc. Even for the flight sim pilot they contain great value.  The below one for CL60 D-AAAY definitely caught our attention

 

 

S2-2022_Bombardier_CL-600-2B16__604__D-AAAY.pdf

[Pils]

3 hours ago, FYG001 said:

I find incident/accident report always highly interesting (and sobering). They often give a unique insight in the machine, the way it is operated, the HMI, the procedures etc etc. Even for the flight sim pilot they contain great value.  The below one for CL60 D-AAAY definitely caught our attention

 

 

S2-2022_Bombardier_CL-600-2B16__604__D-AAAY.pdf 666.02 kB · 1 download

This failure will be added to the product so you can try this out for yourself in the safety of your own home!

[KirkR]

Appreciate you posting this.  Root cause still being pursued, and awareness to operators.  Managing this failure scenario when it is added would include:

-  awareness, identification (drop in speed, change in attitude, flap position indicator on the glass)
-  timely reduction speed to below 45 deg Max Flaps Extension (VFE) speed to avoid structural damage and beyond.

Edited September 26, 2022 by KirkR

[VictoryAJ]

I see colorful breaker collars in our future for 3-B-11 and 2-B-5 similar to what we have now on the 2F8 and 4B8 Stab trim breakers. 

[VictoryAJ]

Quick note. The incident aircraft was a 604. The sharp eyed Hotstart 650 pilot might look at the report wondering why the systems diagram in the report shows Flap motor power from AC BUS 1 (Motor 1) and AC BUS 2 (Motor 2) - yet on the 650,  Motor 1's breaker is located down on CBP 3 (B11), which is the AC ESS BUS. Motor 2 is still behind the right seater's head on CBP2. (B5) [AC BUS 2]

As we transitioned from the 604 to the 605/650 one item we rejoiced over during differences training was the new power source for Flap Motor 1, the AC ESS BUS. On the 604 we we weren't blessed with ESS power to a flap motor - which meant no flaps on the ADG.

This is the same diagram from the 605/650 FCOM.