US FAA orders Boeing 777 fix
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Joined: Feb 2010
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From: Thailand
US FAA orders Boeing 777 fix
US FAA is issuing an Airworthiness Directive this week mandating a software fix for autopilot flight director computers on 777s to prevent runway overruns on takeoff, Boeing confirmed. "Boeing had received operator reports of flight crews inadvertently engaging the autopilot while on the ground," the company told the Seattle Post-Intelligencer. "When the flight crew inadvertently engages the autopilot during the lower-speed phase of takeoff, the control column forces will be higher than normal when the pilot attempts to initiate takeoff rotation. This can result in a high-speed rejected takeoff, and increases the possibility of a runway overrun." FAA reported that there have been nine aborted 777 takeoffs owing to autopilot computer problems in the last 15 years including two this year. No injuries have resulted. Boeing said it has alerted customers to the need for a fix, which could affect as many as 800 aircraft worldwide. Fixes must occur within three months.
Joined: Mar 2000
Posts: 8,571
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From: Arizona USA
Surprising, this.
I would have thought that times had changed...and all modern aircraft could engage the autopilot on the ground (as...that older type can, L1011, in CWS)...excepting, of course, those on the Brit civil register, where it was disabled.
I would have thought that times had changed...and all modern aircraft could engage the autopilot on the ground (as...that older type can, L1011, in CWS)...excepting, of course, those on the Brit civil register, where it was disabled.
Joined: Sep 1999
Posts: 50
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From: London, UK
Autopilot engagement on the ground is normally the result of an accidental push of one of the A/P engagement buttons during the pre flight scan.
HOWEVER there have been a significant number of occasions where the Auto throttle's haven't advanced when the TOGA button was pressed at the beginning of the Take-Off run. This has resulted in a press of the A/T button on the MCP panel to restore A/T operation, before trying to press TOGA again.
In a number of cases the A/P button was pressed instead of the the A/T button thus engaging the autopilot (distractions, high pressure scenario meant that the FMA on the PFD was missed). The auto throttle still wouldn't advance meaning that power would be applied manually, and the autopilot resisted the pull at rotate.
Better FMA awareness is the key but it does seem sensible IMHO to embody this software update.
Best regards,
SR.
HOWEVER there have been a significant number of occasions where the Auto throttle's haven't advanced when the TOGA button was pressed at the beginning of the Take-Off run. This has resulted in a press of the A/T button on the MCP panel to restore A/T operation, before trying to press TOGA again.
In a number of cases the A/P button was pressed instead of the the A/T button thus engaging the autopilot (distractions, high pressure scenario meant that the FMA on the PFD was missed). The auto throttle still wouldn't advance meaning that power would be applied manually, and the autopilot resisted the pull at rotate.
Better FMA awareness is the key but it does seem sensible IMHO to embody this software update.
Best regards,
SR.
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Joined: Mar 2009
Posts: 480
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From: USA
Surprising, this.
I would have thought that times had changed...and all modern aircraft could engage the autopilot on the ground (as...that older type can, L1011, in CWS)...excepting, of course, those on the Brit civil register, where it was disabled.
I would have thought that times had changed...and all modern aircraft could engage the autopilot on the ground (as...that older type can, L1011, in CWS)...excepting, of course, those on the Brit civil register, where it was disabled.
