Prepared by Argha Saha
(Engg Training Dept.)
DIFFERENCES BETWEEN HONEYWELL 131-9 A & APIC APS 3200 APU SYSTEMS
AT A GLANCE
SL. NO.
SYSTEMS
HONEYWELL 131-9 A
APIC APS 3200
1.
IGV ACTUATOR VANE
(AIR SYSTEM)
16 VANES GUIDES AIFLOW FROM PLENUM CHAMBER
TO LOAD COMPRESSOR.
24 VANES GUIDES AIFLOW FROM PLENUM
CHAMBER TO LOAD COMPRESSOR
2.
IGNITOR
(IGNITION SYSTEMS)
ONE IGNITION BOX WITH ONE IGNITOR IS PRESENT.
ONE IGNITION BOX WITH TWO IGNITORS ARE
PRESENT.
3.
BLEED & SURGE
(AIR SYSTEM).
SEPARATE LOAD CONTROL VALVE AND SURGE
CONTROL VALVES ARE PRESENT. LOAD CONTROL
VALVE IS CONTROLLED BY SOLENOID AND SURGE
CONTROL VALVE IS CONTROLLED BY TORQUE
MOTORS. BOTH ARE CONTROLLED BY ECB FOR
PNEUMATIC SUPPLY AND SURGE PROTECTION
RESPECTIVELY.
A SINGLE BLEED CONTROLLED VALVE IS
PRESENT TO CONTROL PNEUMATIC SUPPLY OF
AIR & SURGE PROTECTION BY ECB.
CONTROLLED ELECTRICALLY AND OPERATED
BY REGULATED FUEL MUSCLE PRESSURE.
4.
OIL TANK CAPACITY
(OIL SYSTEM)
SPEED SENSOR
6.2 Lts.
5.3 Lts.
ONE SPEED SENSOR
TWO SPEED SENSOR
FUEL NOZZLES
(FUEL SYSTEMS)
PMG IN GEARBOX
10 FUEL NOZZLES (WITH PRIMARY & SECONDARY
ORIFICE)
NOT PRESENT
OIL PUMP
(OIL SYSTEM)
PROTECTIVE
SHUTDOWN
DEOILING SOLENIOD
VALVE (OIL SYSTEM).
OIL IS PRESSURISED BY GEROTOR TYPE PUMP
9 FUEL INJECTORS ( 3 PRIMARY & 6 MAIN
INJECTORS)
PMG IS PRSEENT FOR SUPPLY OF POWER TO ECB
IN EMERGENCY AND BACKUP OVERSPEED
PROTECTION
VANE TYPE PUMP IS PRESENT
GEARBOX HIGH OIL TEMP. LIMIT: 162.78 DEGREE C
LOW OIL PR. THRESHOLD: 33 PSI.
ECB ENERGIZES IT TO REMNAIN OPEN DURING APU
STARTING AT LOW TEMPERATURE UPTO 6O% SPEED
TO REDUCE LOAD ON THE PRESSURE PUMP &
GEARBOX HIGH OIL TEMP. LIMIT: 135 DEGREE C
LOW OIL PR. THRESHOLD: 35 PSI.
ECB ENERGIZES IT TO REMNAIN OPEN DURING
APU STARTING AT LOW TEMPERATURE UPTO
55% SPEED TO REDUCE LOAD ON THE
5.
6.
7.
8.
9.
10.
Prepared by Argha Saha
(Engg Training Dept.)
REOPENS DURING SHUTDOWN FROM 50% TO 7%
SPEED TO PREAVENT COKING.
STARTER CONTACTOR &
IGNITION UNIT
ENERGIZING &
DEENERGIZING
SEQUENCE
(STARTING & IGNITION)
3 WAY FUEL SHUT OFF
SOLENOID VALVE
COOLDOWN TIME
(IN CASE PNEUMATIC
SUPPLY IS IN USE)
OIL TEMPEARTURE
SENSOR.
ECB ENERGIZES THE STARTER CONTACTOR &
IGNITION SYSTEM DURING STARTING. STARTER
CONTACTOR & IGNITION SYSTEM GET DEENERGIZED
AT 50% & 60 % SPEED RESPECTIVELY.
PRESSURE PUMP & REOPENS DURING
SHUTDOWN FROM 90% TO 7% SPEED TO
PREAVENT COKING.
ECB ENERGIZES THE STARTER CONTACTOR &
IGNITION SYSTEM DURING STARTING. BOTH
STARTER CONTACTOR & IGNITION SYSTEM GET
DEENERGIZED AT 55% SPEED.
ENERGIZED OPEN BY ECB DURING STARTING AT
SPEED 7%.
60 SECS
ENERGIZED OPEN BY ECB DURING STARTING AT
SPEED > 3%
120 SECS.
ONE SENSOR IS PRESENT.
15.
OIL PRESSURE
REGULATION.
HAVING BOTH PRESSURE REGULATOR & RELIEF
VALVE.
TWO SENSORS ARE PRESENT ONE AT THE
PRESSURE LINE AND OTHER ON THE
GENERATOR.
ONLY RELIEF VALVE IS PRESENT.
16.
FUEL PRESSURE
DELIVERY
FUEL IS PRESSURISED BY HP PUMP ONLY IN FCU
(FUEL CONTROL UNIT).
11.
12.
13.
14.
Page 2.
FUEL IS PRESSURISED BY LP PUMP & HP PUMP
IN FCU (FUEL CONTROL UNIT).