PASUKAN UDARA TENTERA DARAT
REFERENCE
 A109 LOH ELECTRICAL TRAINING
MANUAL CH 24
 A109 LOH ROTORCRAFT FLIGHT
MANUAL VOL 1
OBJECTIVE
AT THE END OF THE LESSON, STUDENT
WILL ABLE TO :
 UNDERSTAND DC POWER SYSTEM
 MENTION THE COMPONENT AND PART OF
DC POWER SYSTEM
 MENTION THE INDICATION OF DC
POWER SYSTEM
SCOPE
DC GENERATION SYSTEM
DC DISTRIBUTION SYSTEM
ELECTRICAL MONITORING AND
INDICATION
DC GENERATION SYSTEM
3 TYPE POWER SOURCE FOR AIRCRAFT
EXTERNAL GROUND POWER UNIT
INTERNAL POWER
PRIMARY POWER GENERATION
EXTERNAL GROUND POWER
INTERNAL POWER / AIRCRAFT BATERY
INTERNAL POWER / AIRCRAFT BATERY
 BATTERY TYPE (NI-CD)
 BATTERY RATING (24V-40A/H)
PRIMARY POWER GENERATION
DC STARTER GENERATOR





OUTPUT POWER (6 KVA)
OUTPUT VOLTAGE (28V)
MAX TRANS LOAD (300A)
MAX CONT LOAD (200A)
SPEED RANGE (7200RPM TO 12100RPM)
DC GENERATION SYSTEM
STARTER- GEN 1
AIRCRAFT LOAD
EXTERNAL POWER
@ BATTERY
STARTER-GEN 2
* CHANGE FROM STARTER TO GENERATOR AT 7193 RPM
OR
50% NG
DC GENERATION CONTROL
MSTR AVNX
BAT SWITCH
GEN SWITCH
GEN BUS SWITCH
MSTR AVNX SWITCH
 GND
COM
 GND
 NORM
MSTR AVNX SWITCH
MSTR AVNX switch set to GND
COM only the following
equipment is supplied with
electrical power
•GCP#1
•GCP#2
•V/UHF #2 & LOGIC UNIT
•ADL
•CMU
•MCDU
•NAVM
•HF
DC GENERATION CONTROL
MSTR AVNX switch set to GND,
electrical power is removed from
•MFD #1
•DF
•IFF
•DVS
•HF transceiver
•Observation system
•VOR
DC DISTRIBUTION SYSTEM
DC DISTRIBUTION SYSTEM
COMPONENT AND LOCATION
AIRCRAFT FEEDER BUSSES






MAIN BUS
MISSION BUS
EMERGENCY BUS
ESSENTIAL BUS
GROUND BUS
BATTERY BUS
DC POWER SYSTEM BLOCK DIAGRAM
DC POWER SYSTEM BLOCK DIAGRAM
DC POWER SYSTEM BLOCK DIAGRAM
DC POWER SYSTEM BLOCK DIAGRAM
AIRCRAFT BATTERY
AIRCRAFT BATTERY
AIRCRAFT BATTERY
ELECTRICAL MONITORING AND
PROTECTION
WARNING INDICATION
 ELECTRICAL
 BATT DISCH
ELECTRICAL MONITORING AND
PROTECTION
 ELECTRICAL
WHEN BOTH GENERATORS ARE
INOPERATIVE, THE FLIGHT CAN
BE CONTINUED ON BATERY
POWER FOR A MAXIMUM OF 30
MINUTES
IF THE GENERATOR BUSSES ARE
NOT DISCONNECTED, THE
BATERY IS CAPABLE FOR ONLY 20
MINUTES
ELECTRICAL MONITORING AND
PROTECTION
CAUTION INDICATION
#1 DC GEN
#2 DC GEN
#1 ESS BUS
#2 ESS BUS
#1 EMER BUS
#2 EMER BUS
#1 DC CTRL
#1 DC CTRL
#1 BUS TIE
#2 BUSTIE
BATT OFF
EXT PWR
ELECTRICAL MONITORING AND
PROTECTION
CAUTION INDICATION
#1 DC GEN
#2 DC GEN
#1 ESS BUS
#2 ESS BUS
#1 EMER BUS
#2 EMER BUS
#1 DC CTRL
#1 DC CTRL
#1 BUS TIE
#2 BUSTIE
BATT OFF
EXT PWR
ELECTRICAL MONITORING AND
PROTECTION
CAUTION INDICATION
#1 DC GEN
#2 DC GEN
#1 ESS BUS
#2 ESS BUS
#1 EMER BUS
#2 EMER BUS
#1 DC CTRL
#1 DC CTRL
#1 BUS TIE
#2 BUSTIE
BATT OFF
EXT PWR
ELECTRICAL MONITORING AND
PROTECTION
CAUTION INDICATION
#1 DC GEN
#2 DC GEN
#1 ESS BUS
#2 ESS BUS
#1 EMER BUS
#2 EMER BUS
#1 DC CTRL
#1 DC CTRL
#1 BUS TIE
#2 BUSTIE
BATT OFF
EXT PWR
ELECTRICAL MONITORING AND
PROTECTION
CAUTION INDICATION
#1 DC GEN
#2 DC GEN
#1 ESS BUS
#2 ESS BUS
#1 EMER BUS
#2 EMER BUS
#1 DC CTRL
#1 DC CTRL
#1 BUS TIE
#2 BUSTIE
BATT OFF
EXT PWR
ELECTRICAL MONITORING AND
PROTECTION
CAUTION INDICATION
#1 DC GEN
#2 DC GEN
#1 ESS BUS
#2 ESS BUS
#1 EMER BUS
#2 EMER BUS
#1 DC CTRL
#1 DC CTRL
#1 BUS TIE
#2 BUSTIE
BATT OFF
EXT PWR
ELECTRICAL MONITORING AND
PROTECTION
CAUTION INDICATION
#1 DC GEN
#2 DC GEN
#1 ESS BUS
#2 ESS BUS
#1 EMER BUS
#2 EMER BUS
#1 DC CTRL
#1 DC CTRL
#1 BUS TIE
#2 BUSTIE
BATT OFF
EXT PWR
BATTERY POWER
GROUND POWER UNIT
EXTERNAL GROUND POWER
•A DC receptacle located on the
right section on the cabin.
•Supply power to all DC busses of
the aircraft.
•Used for engine starting &
maintenance purposes.
•Rectifier & Power Pack.
WARNING,CAUTION & ADVISORY
INDICATIONS
 DC Warning
 DC Caution
 DC Advisory
- Red
- Yellow
- Green
 The EPDGS advices system
status and malfunction through
the AMS Advisory, Caution and
Warning System.
 Located on screen in
instrument console
DC POWER SYSTEM CONTROLS &
INDICATIONS
DC POWER SYSTEM CONTROLS AND
INDICATIONS
DC POWER SYSTEM CONTROLS AND
INDICATOR
OVERHEAD CONSOLE PANEL CB
CO PILOT OVERHEAD CONSOLE PANEL
CB
PILOT OVERHEAD CONSOLE PANEL CB