TM 1-2840-252-23-3
G-12 ABBREVIATIONS
A/D
Analog-to-digital
N2A
N2 signals from
AL
Alumel
N2B
dual magnetic pickup
BLD
Bleed
N2SET
Power turbine set speed
C/P
Collective pitch angle (same as RTL)
O/S
Overspeed
CDP
Compressor discharge pressure
O/STAT
Overspeed status
CJC
Cold
junction
compensation
for
Paf
Metering head regulator bypass return
temperature signal
pressure
CR
Chromel
Pbc
Mechanical speed sensor pressure out-put
DC
Direct current
Pf
Pump discharge pressure
DECU
Digital Electronic Control Unit
Pfm
Pump discharge pressure metered
EEPROM
Electrically erasable programmable read-
PLA
Power lever angle
only memory
ECL
Engine control lever
Pm
Bleed system pressure
ECLEX
ECL excitation
Pme
Metering valve discharge pressure
EGT
Exhaust gas temperature
Pn
Fuel pressure to engine
EMS
Engine monitoring system
Pot.
potentiometer
EX
Excitation
PSM
Primary stepper motor
E01
Engine out indicator #1
Pw
Windmill bypass valve pressure
E02'
Engine out indicator #2
P1
Atmospheric air pressure
FADEC
Full Authority Digital Electronic Control
P3
Compressor discharge pressure
F/R
Failure/reversionary selected
Q
FPU
Fuel Pump Unit
RAM
Random access memory
GND
Ground
REF
Reference
HMA
Hydromechanical Assembly
RET
Return
HMU
Hydromechanical Unit
RSM
Reversion stepper motor
IGN
Ignition
RTL
Rotor thrust lever (same as collective
pitch)
LRU
Line Replaceable Unit
REV
Reversionary control mode
LVDT
Linear variable displacement transformer
SEL
Select
MAG
Magnetic
SIG
Signal
MV
Metering valve
SOL
NR
Sensed rotor speed
T1
Ambient temperature
NVM
Non-volatile memory
T4.5
Power turbine inlet temperature
N1
Sensed core speed
VDC
Volts direct current
N1A
N1 from magnetic speed pickup
VEM
Emergency voltage
N1B
N1 from alternator
Wf
Fuel flow
N2
Sensed power turbine speed
Ohms
TBD
To be determined
G-10
