FAA Approved Airplane Flight Manual Supplement

Hawker Beechcraft B300 and B300C King Air 190-00716-03 Rev. 1
Page 128 of 141
ENGINE INSTRUMENTATION
Engine instruments, located in a window on the left side of the MFD, are grouped according to their
function. The G1000 engine gauges are constructed and arranged to emulate the mechanical gauges
they replaced. At the top, the ITT (Interstage Turbine Temperature) indicators and torquemeters are
used to set take-off power. Climb and cruise power are established using the torquemeters and
propeller tachometers while observing ITT limits. Gas generator (N
1
) operation is monitored by the gas
generator tachometers. The lower grouping consists of the fuel flow indicators and the oil
pressure/temperature indicators.
The engine transducers send their signals to the GARMIN GEAs (Engine and Airframe LRU) which
process the signals and allow the engine parameters to be displayed on the MFD. There are two GEAs;
one for each engine. Operating on 28vdc power, both GEAs receive power from the Triple Fed Bus.
The GEAs are protected by circuit breakers located on the left side circuit breaker panel labeled GEA.
The ITT indicator gives a reading of engine gas temperature between the compressor turbine and the
power turbines. A digital indication combined with the pointer gives a resolution of 1
O
C.
The torquemeters give an indication in percent (%) torque being applied to the propeller. A digital
indication combined with the pointer gives a resolution of 0.2%.
Propeller Autofeather annunciations are located adjacent the torquemeters, to the upper right of each
indicator. When the autofeather system is armed, the green ‘AFX’ annunciations will be posted.
The propeller tachometer reads directly in revolutions per minute. A digital indication combined with the
pointer gives a resolution of 10 RPM.
The N
1
or gas generator tachometer is in percent of RPM, based on a figure of 37,500 RPM at 100%.
Maximum continuous gas generator speed is limited to 39,000 RPM or 104.0% N
1
. A digital indication
combined with the pointer gives a resolution of 0.1% RPM.
The fuel flow indicators give an indication of fuel consumption in pounds of fuel per hour. A digital
indication combined with the pointer gives a resolution of 1 lb/hr.
The oil pressure indicator displays oil pressure (in PSI). A digital indication combined with the pointer
gives oil pressure a resolution of 1 psi.
The oil temperature indicator displays oil temperature (in Degrees Celsius). A digital indication
combined with the pointer gives oil temperature a resolution of 1°C
A propeller synchroscope, located above and between the propeller tachometers, indicates propeller
synchronization. When the propellers are operating at the same RPM, the display will show stationary
diamond symbols. As one propeller begins to turn faster than the other propeller, the diamonds will
begin to move towards the faster turning propeller and transition into an arrowhead pointing towards the
faster turning propeller. The transition to a full arrowhead is complete when the propeller speed
difference is equal to 50 RPM. This instrument aids the pilot in obtaining synchronization of the
propellers.