Electrical System; Starter Generator; Stand-By Generator; Battery - Daher-Socata TBM 900 Pilot's Information Manual

PILOT'S OPERATING HANDBOOK

7.8 - ELECTRICAL SYSTEM

The airplane is fitted with a 28-Volt direct-current electrical system.
Electrical supply is obtained from various power supplies :
- a starter generator
- a stand-by generator
- a battery
- a ground power unit, via a plug, located on L.H. side.
Connection relays, main bus bar, generator regulation and protection systems and control logic systems are
grouped in Electrical Power System box located in front baggage compartment upper section.
Electrical system indicating is displayed on the GDU 1500 MFD and monitoring is ensured by CAS messages.
On ground, when the crash lever is positioned in the UP position ("SOURCE" selector in the "OFF" position), the
battery supplies the electrical power system through the "BATT BUS". A Power Up Built In Test (P-BIT) of the EPS
internal functions is performed to verify the operating status. In case of failure detection, a white message "EPS
SERVICE REQUIRED" appears in the message window on the PFD.

STARTER GENERATOR

The starter generator is the main electrical power source. It only performs its generator function when starting
sequence is completed.
Generator connection with main bus bar is controlled through "GENERATOR" selector set to MAIN position. It will
be effective when connection conditions are met. Generator connection is indicated by
message disappearance.
STARTER GENERATOR will not supply airplane if source switch is on GPU.
On ground, generator load should be maintained below 200 amps.

STAND-BY GENERATOR

Stand-by generator supplies a 28-volt stand-by direct current which may be used in case of main generator failure.
Generator connection with main bus bar is controlled through "GENERATOR" selector set to ST-BY, it will be
effective when connection conditions are met.
STAND-BY GENERATOR will not supply airplane if source switch is on GPU.
In order to prevent possible errors during flight, access to ST-BY position requires a double
action from the pilot (pull to unlock). On ground, avoid using stand-by generator at full load.

BATTERY

The battery provides the power required for starting when no ground power unit is available and is a power supply
source when engine driven generators are stopped.
The battery is always connected to "BATT BUS" bus bar except when crash lever is pulled down.
Battery connection to main bus bar is controlled through "SOURCE" selector set to BATT position.
"BAT OFF"
CAS message lights on when battery is isolated from the main bus and when main bus is supplied
through another source.
Edition 0 -- October 31, 2013
Rev. 1
(Figures 7.8.1 and 7.8.4)
NOTE
NOTE
SECTION 7
DESCRIPTION
"MAIN GEN"
CAS
Page 7.8.1