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Spoiler Control Module (-200 Series) With BITE Display
Figure 12

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FAULT MESSAGE  DISCUSSION 
SCM  THIS FAULT SHOWS WHEN A PROBLEM IS DETECTED IN THE SPOILER CONTROL MODULE (SCM) 
FAULT  WHICH SHOWS THIS MESSAGE. IF THE SCM SHELF POSITION IS CHANGED, THIS FAULT WILL CONTINUE TO SHOW ON THE SAME SCM. 
FAULT SCM 2L FAULT SCM 3L FAULT SCM 1L  FAULT SCM 2R FAULT SCM 3R FAULT SCM 1R  THIS FAULT SHOWS WHEN A SCM ON THE SAME SHELF DETECTS: A DIFFERENT SCM THAT IS NOT INSTALLED CORRECTLY A CIRCUIT BOARD ON THE DIFFERENT SCM THAT IS DISLODGED A DISCONNECTED INTERCONNECT WIRE BETWEEN THE TWO SCMs. 1) 2) 3) 
26 VAC  26 VAC  THIS FAULT SHOWS WHEN A SCM DETECTS A 26V AC POWER SIGNAL THAT IS LESS THAN 
27-61-13  27-61-14  16.5V AC. 
26 VAC  26 VAC  A DEFECTIVE POWER SUPPLY MODULE (PSM), OR A SHORTED CIRCUIT IN THE SPEEDBRAKE 
27-61-15  27-61-16  TRANSDUCER, THE CONTROL WHEEL TRANSDUCER, THE SCM, OR THE WIRING BETWEEN THESE COMPONENTS, CAN CAUSE THIS FAULT. 
26 VAC  26 VAC  THIS FAULT WILL SHOW ON ALL 3 SCMs ON THE SAME SHELF IF THERE IS A DEFECTIVE 
27-61-17  27-61-18  WILL AGREE ON ALL 3 SCMs. PSM. ALSO, THE WIRING DIAGRAM MANUAL (WDM) REFERENCE SHOWN IN THE FAULT DETAILS 
A/G SYS1  EACH SCM HAS 3 AIR/GROUND SENSOR INPUTS. AN OPEN VOLTAGE GIVES A SIGNAL THAT 
FAULT  THE AIRPLANE IS IN THE AIR. A GROUND VOLTAGE GIVES A SIGNAL THAT THE AIRPLANE IS ON THE GROUND. 
A/G SYS2  THIS FAULT SHOWS WHEN 1 OF THE 3 AIR/GROUND INPUTS DISAGREES FOR 25 SECONDS, OR 
FAULT  WHEN A DISAGREE OCCURS DURING A REDUNDANCY MANAGEMENT OPERATION (A "SWITCH" OR A "SWITCH INHIBIT" ACTION). 
AIR/GND  THIS FAULT CAN SHOW WHEN YOU CHANGE THE AIR/GROUND STATE OF THE AIRPLANE DURING 
FAULT  NORMAL MAINTENANCE OPERATIONS. 
SB LVDT  THERE ARE 3 SPEEDBRAKE TRANSDUCERS (LINEAR VARIABLE DIFFERENTIAL TRANSFORMERS 
FAULT  OR LVDTs) FOR EACH SHELF. EACH TRANSDUCER SENDS A SIGNAL TO EACH SCM. THIS FAULT SHOWS WHEN 1 OF THE SPEEDBRAKE TRANSDUCER SIGNALS IS OUT OF THE TOLERANCE RANGE OF THE OTHER 2 SIGNALS. FOR A DEFECTIVE LVDT, THIS FAULT WILL SHOW ON ALL 3 SCMs ON THE SAME SHELF. IF THIS FAULT SHOWS TWO TIMES ON THE SAME SCM, THEN ALL 3 OF THE SPEEDBRAKE TRANSDUCER SIGNALS WERE OUT OF THE TOLERANCE RANGE WITH EACH OTHER. 
CW RVDT  THERE ARE 3 CONTROL WHEEL TRANSDUCERS (ROTARY VARIABLE DIFFERENTIAL TRANSFORMERS
FAULT  TRANSDUCER SIGNALS WERE OUT OF THE TOLERANCE RANGE WITH EACH OTHER. IF THIS FAULT SHOWS TWO TIMES ON THE SAME SCM, THEN ALL 3 OF THE CONTROL WHEEL SHOW ON ALL 3 SCMs ON THE SAME SHELF. TOLERANCE RANGE OF THE OTHER 2 SIGNALS. FOR A DEFECTIVE RVDT, THIS FAULT WILL THIS FAULT SHOWS WHEN 1 OF THE CONTROL WHEEL TRANSDUCER SIGNALS IS OUT OF THE OR RVDTs) FOR EACH SHELF. EACH TRANSDUCER SENDS A SIGNAL TO EACH SCM. 

-200 Series SCM - Fault Message Description Figure 13 (Sheet 1)
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FAULT MESSAGE  DISCUSSION 
PSM 1 PSM 2  THIS FAULT SHOWS WHEN A SCM DOES NOT RECEIVE A VALID POWER SIGNAL FROM THE PSM
FAULT FAULT  DEFECTIVE PSM, THIS FAULT WILL SHOW ON ALL 3 SCMs ON THE SAME SHELF. SHOWS THIS FAULT. THIS FAULT ALSO SHOWS WHEN THERE IS A WIRING FAULT FROM THE PSM TO THE SCM THAT ON THE SAME SHELF. THIS USUALLY OCCURS WHEN THERE IS A DEFECTIVE PSM. FOR A 
PCA 1 PCA 7  A POWER CONTROL ACTUATOR (PCA) IS THE UNIT AT THE WING WHICH USES THE HYDRAULIC 
FAULT FAULT  EACH SCM CONTROLS A SYMMETRICAL PAIR OF PCAs, ONE ON THE LEFT WING AND ONE ON THE RIGHT WING. PRESSURE TO RAISE AND LOWER THE SPOILER PANEL. 
　
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