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Forum: Tech Log

2nd Dec 2020, 23:46

Replies: 99

B-737 Speed Trim System

Views: 79,681

Posted By RobTek

The only commonality between STS and MCAS is that...

The only commonality between STS and MCAS is that they are both functions of the FCC and Both systems move the Stab.
They are different and seperate operating logic

Forum: Tech Log

2nd Dec 2020, 23:37

Replies: 99

B-737 Speed Trim System

Views: 79,681

Posted By RobTek

Just to carify The STS system is a FCC...

Just to carify
The STS system is a FCC function, there 2 FCC (A and B), Either FCC will provide STS, if there a single failure (speed trim fail light will illuminate on recall) and as noted continue...

Forum: Tech Log

2nd Dec 2020, 00:09

Replies: 99

B-737 Speed Trim System

Views: 79,681

Posted By RobTek

STS trim stops if the column cutout switches are...

STS trim stops if the column cutout switches are activated, in the direction that will oppose what the stabiliser is doing.

Forum: Tech Log

2nd Dec 2020, 00:06

Replies: 99

B-737 Speed Trim System

Views: 79,681

Posted By RobTek

That means the aircraft is accelerating diring...

That means the aircraft is accelerating diring the climb, and STS is trying to slow you down.
Dont forget that stabiliser movement cause the column to move if you are not holding it and STS will...

Forum: Tech Log

1st Dec 2020, 23:55

Replies: 99

B-737 Speed Trim System

Views: 79,681

Posted By RobTek

The STS system is a FCC function that when...

The STS system is a FCC function that when engaged calculates the climb air speed (trimmed speed), external conditions like wind speed and direction affect air speed, the FCC moves the stabilizer to...

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