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MAINTENANCE MANUAL
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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MAINTENANCE MANUAL
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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