Page 96.8 Chapter 96 Electrical System R66 Maintenance Manual SEP 2012
96-80 Engine Monitoring Unit (EMU)
Refer to Section 71-43 for EMU maintenance procedures.
The Engine Monitoring Unit (EMU) is a digital recording device mounted behind the right rear
seatback panel. The EMU continuously monitors N
1
, N
2
, engine torque, and MGT. EMU
status is indicated by the EMU segment on the annunciator panel. The EMU segment will
only illuminate while the annunciator panel test button is depressed. The EMU requires
approximately ten seconds to initialize after the aircraft battery is switched ON. Once
initialization is complete, steady illumination of the annunciator means normal EMU operation.
A slowly flashing indication (once every two seconds) is given if the EMU detects a fault in its
senders or circuitry. A fast flashing indication (four times per second) is given if the EMU has
detected an exceedance. A fault or exceedance indication should be investigated and reset by
a qualified mechanic prior to further flight.
The EMU records exceedances of Rolls-Royce engine limits, not airframe operating limits as
given in Section 2. The EMU will record an exceedance if any of the following are exceeded:
MGT during start: 999°C, or 927°C for 1 second, or 810°C for 10 seconds.
MGT engine running: 843°C, or 782°C for 6 seconds, or 706°C for 5 minutes.
N
1
: 106%, or 105% for 15 seconds.
N
2
: 110%, or 105% for 15 seconds.
78% to 88% for 60 seconds over 38% torque.
Torque: 122% for 15 seconds, or 104% for 5 minutes.
The EMU also records a start cycle when N
1
exceeds 30% and MGT is at least 343°C.
The EMU is intended to be used only as a maintenance aid. It is the pilot's responsibility to
report any observed exceedances and the operator's responsibility to maintain a record of
engine starts and time in service.
96-90 Emergency Locator Transmitter (ELT)
Refer to Section 25-61 for ELT programming instructions and maintenance procedures.
The Emergency Locator Transmitter (ELT) installation consists of a transmitter with internal
battery pack, an external antenna, and a remote switch/annunciator. The transmitter is
mounted to the upper steel tube frame and is accessible through the spring loaded air intake
door in the right-side cowl. The remote switch/annunciator is located left of the cyclic stick.
The ELT is operated by a switch on the transmitter and by the remote switch. The transmitter
switch has been set in the ARM position at installation and should always be in this position
for flight. The remote switch/annunciator is a three position switch with indicator light. This
switch should be in the ARMED position for flight. With both switches set to armed, the ELT
will begin transmitting when subjected to a high "G" load. When the unit is transmitting, the
red indicator light illuminates.
Moving the remote switch to ON activates the transmitter. Use the ON position if an emergency
landing is imminent and time permits.
If the ELT is inadvertently activated, use the momentary RESET & TEST position of the remote
switch to stop transmission and reset the unit. The red indicator will extinguish when unit is
reset.
For more detailed instructions on ELT operation, maintenance, and required tests, refer to
manufacturer's instructions supplied with the unit.
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