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TM 55-4920-412-13&P
f.
Rotor Overspeed 127%, 137%, 142%, sensing
A or B, Rotor SPEED, ENG 1 OUT, ENG 2 OUT, OIL 1
PRESS, OIL 2 PRESS, OIL 1 TEMP and OIL 2 TEMP,
INT LIGHT, Lamp circuits.
(1)
Press LAMP TEST switch on simulator to
light Lamps before troubleshooting circuits.
(2)
Refer to schematic FO-6 to troubleshoot
applicable circuits.
(3)
Troubleshooting
Table
4-25
identifies
probable causes of trouble.
Table 4-25. Troubleshooting Rotor Overspeed, 127%o 137%, 142%, Sensing, Rotor Speed, ENG 1 OUT, ENG 2 OUT,
OIL 1 PRESS, OIL 2 PRESS, OIL 1 TEMP, OIL 2 TEMP, INT LIGHT, LAMP CIRCUITS.
NOTE
Voltage input is from CDU or SDC when testing.
Trouble
Probable Cause
Remedy
Rotor 127% overspeed lamp will not
Redundant Warn O/P switch (S7),
Replace defective components, FO-6
light
Lamp Test Board
Rotor 137% overspeed lamp will not
Redundant Warn O/P switch (S7),
Replace defective components, FO-6
light
Lamp Test Board
Rotor 142% overspeed lamp will not
Redundant Warn O/P switch (S7)
Replace defective components, FO-6
light
Lamp Test Board
Sensing A or B lamps will not light
Lamp Test Board, J3 or J2 con-
Replace defective components, FO-6
nector
Rotor speed lamp will not light
S7, Interconnecting cable, J3 or J2
Replace defective components, FO-6
connectors, Lamp Test Board
ENG 1 OUT or ENG 2 OUT lamps
Lamp Test Board, J3 or J2 con-
Replace defective components, FO-6
will not light
nector
OIL 1 PRESS or OIL 2 PRESS
Lamp Test Board, J2 or J3 con-
Replace defective components. FO-6
lamps will not light
nector
High OIL Temp 1 or 2 lamps will
Lamp Test Board, J2 or J3 con-
Replace defective components, FO-6
not light
nector
INT light lamps will not light
Lamp Test Board, J8 or J9 con-
Replace defective components, FO-6
nector
4-50
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