SYSTEM DESCRIPTION (cont)
(i) Pilot and CPG LVDT (fig. 1132) positions are compared by a level detector. If the level detector
detects a difference of position of 40% (mistrack), the DASEC commands disengagement of that axis. This
action lights the ASE indicators on the pilot and CPG caution/warning panels.
+ 30% IN
Position LVDT Monitor Functional Block Diagram
(j) The pitch stability command augmentation system (SCAS) (fig. 1133) is a combination of SAS and
CAS. Pitch SCAS controls the helicopters pitch axis as a function of rate, attitude and cyclic stick position. When
the pitch engage switch on the pilot ASE panel is placed in the PITCH position, the DASEC latches the switch and
engages pitch SCAS. The DASEC disengages pitch SCAS under the following conditions: if HARS or ADSS
malfunctions, the SAS servocylinder LVDT feedback does not match the DASEC mathematical model, a mistrack
between the pilots and CPGs LVDTs occurs, a mistrack between dual position 1 (BUCS 1) LVDT and the pilots
LVDT occurs, or a mistrack between dual position 1 (BUCS 1) and dual position 2 (BUCS 2) occurs.
Disengagement lights the ASE indicators on the pilot and CPG caution/warning panels.
PILOT LVDT INPUT
SAS LVDT FEEDBACK
SAS/CAS Pitch Functional Block Diagram