Speed trim qustion B737 classic and NG
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Join Date: Jul 2001
Location: Denmark
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Speed trim qustion B737 classic and NG
Hi.
Anyone out there who can enlighten me as to why the "speed trim fail" light is on when the IRS' are not aligned??
Kind regards
Anyone out there who can enlighten me as to why the "speed trim fail" light is on when the IRS' are not aligned??
Kind regards
Join Date: Nov 2004
Location: here..
Posts: 30
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The speed trim system(STS) monitors different inputs such as airspeed, vertical speed, stabilizer position and thrustlever position, in order to augment the speed stability of the aircraft by commanding the stabilizer in different directions. As long as the ADIRUs(air data/inertial reference units) are not fully aligned, a few input will be considered unreliable by the Flight Control Computers(FCCs), thereby causing the STS to ”fail”.
Rgrds VK
Rgrds VK
