SECTION 7
DESCRIPTION
T B M
700 PILOT’S INFORMATION MANUAL
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Page 7.8.3
Rev. 8
DISTRIBUTION
Airplane electrical systems are connected to ”BUS” bars and protected by
circuit breakers located on L.H. side panel, near the pilot (See Figures 7.8.3,
7.8.3A and 7.8.3B) or on R.H. side panel, if ”pilot” door installed (See
Figure 7.8.3C). In case of overload of a system, the circuit breaker triggers
and switches the system off. Allow it to cool for about three minutes, then the
circuit breaker may be reengaged (pressed down). Some systems are
equipped with ”pull off” type circuit breakers which allow the pilot to insulate, if
necessary, the corresponding equipment.
”BUS 1”, ”BUS 2”, ”BUS 3” and (if installed) ”BUS 4” bus bars are directly
connected to main bus bar and protected by fuses located in electrical power
center.
”ESS 1” and ”ESS 2” essential bus bars are connected to main bus bar
through ”ESS BUS TIE” selector set to ”NORM” position. ”ESS BUS TIE”
selector is attached to circuit breaker panel, ”NORM” position is protected
and locked by a cover. Common power supply to both essential bus bars is
protected by a fuse, each bar being individually protected by a circuit breaker.
”BUS BAT” bar is directly connected to the battery, it is protected by a fuse
located in electrical power center.
NOTE :
The electrical distribution of bus bars is described in Figure 7.8.2.
EMERGENCY USE
With both generators de–activated in flight, it is still possible to use battery
power to supply all airplane systems maintaining ”SOURCE” selector on
”BAT” position.
In order to save battery power, it is possible to shed the charges which are not
essential for flight safety, for that set :
–”ESS BUS TIE” selector to ”EMER” position
In this configuration, only ”ESS 1”, ”ESS 2” and ”BAT BUS” bars are supplied.
NOTE :
Supplying ”BUS 1”, ”BUS 2”, ”BUS 3” and (if installed) ”BUS 4” bars is always
possible, resetting temporarily ”ESS BUS TIE” selector to ”NORM” position.
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