Uncommanded Flap Retraction after V1
Join Date: Jan 2006
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While improbable, later Beoings have protection from uncommanded flap movements.
From the Boeing 737-700 (Vol. 2)
Trailing Edge Uncommanded Motion
Uncommanded motion is detected when no FLAP lever or flap load relief command is present and the TE flaps:
• move away from the commanded position
• continue to move after reaching a commanded position, or
• move in a direction opposite to that commanded.
The FSEU shuts down the TE drive unit by closing the TE flap bypass valve. TheTE flap shutdown cannot be reset by the flight crew and they must use the alternate flap system to control TE flaps. The shutdown is indicated by the flap position indicator disagreeing with the FLAP lever position. There is no flap needle split.
From the Boeing 737-700 (Vol. 2)
Trailing Edge Uncommanded Motion
Uncommanded motion is detected when no FLAP lever or flap load relief command is present and the TE flaps:
• move away from the commanded position
• continue to move after reaching a commanded position, or
• move in a direction opposite to that commanded.
The FSEU shuts down the TE drive unit by closing the TE flap bypass valve. TheTE flap shutdown cannot be reset by the flight crew and they must use the alternate flap system to control TE flaps. The shutdown is indicated by the flap position indicator disagreeing with the FLAP lever position. There is no flap needle split.
