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B787 FLT CONTROL MODE

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B787 FLT CONTROL MODE

Old 18th Mar 2017, 12:08
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Join Date: Feb 2000
Location: LHR and beyond
Posts: 134
B787 FLT CONTROL MODE

Hi Guys

Can anyone explain why when you have this failure you cannot use FLCH SPD with flaps not up and not allowed to follow flight director pitch guidance?

QRH notes indicates a service bulletin FCE CBP2 but i don't have this bulletin as it is engineers only by all accounts!

thoughts please?
fast cruiser is offline  
Old 20th Mar 2017, 19:16
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Join Date: Feb 2009
Location: Seattle
Posts: 379
787 Secondary Mode

This message is an indication that the 787 Primary Flight Control System has dropped to Secondary Mode. The Autopilot will no longer be available. I am not sure of the status of the Flight Director. One of the most likely reasons for losing Normal Mode and ending up in Secondary Mode is loss of valid air data which would make any Flight Director commands that rely on air data similarly suspect.
FCeng84 is offline  
Old 22nd Mar 2017, 08:34
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Join Date: Oct 2009
Location: Australia the Awesome
Posts: 159
Hi Fast,

Do you have a reference for this? My company QRH doesn't mention it (although I do remember it from the type rating)

My take on it is the FLT DIR will indicate whatever the MCP/FMC is programmed, but the lack of Autopilot combined with what FCeng84 said, plus no autothrottle wake up in FLCH SPD will make this a perilous combination.
Roj approved is offline  

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