(2)
At 55% engine speed, the ECB 59KD de-energizes the exiter and the starter motor 8 KA. The engine continues to accelerate under its own power to governed speed. The speed control function in the ECB 59KD transmit a signal to the FCU. The FCU then increases or decreases the fuel flow as necessary for the changes in load. This keeps the speed of the APU constant.
(3)
As the engine accelerates, the ECB 59KD transmits a signal to the servo valve in the FCU to control the metered fuel flow. The fuel acceleration control in the ECB 59KD keeps the necessary fuel flow until the engine gets to governed speed. At low speed all pump flow goes to the pilot injectors.
The engine accelerates, the fuel flow increases to a set level and the main injector valve of the FDDVA opens. This permits more fuel to flow.
APU FUEL CONTROL ((APS 3200)) - INSPECTION/CHECK
________________________________________________
TASK 49-32-00-200-002
Visual Check of Fuel Distribution System for Condition and Security (APS 3200)
WARNING : DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS
_______ WHEN YOU DO THE MAINTENANCE TASK(S).
WARNING : DO NOT GET AIRCRAFT FUEL:
_______
-
IN YOUR MOUTH
-
IN YOUR EYES
-ON YOUR SKIN FOR A LONG TIME.
AIRCRAFT FUEL IS POISONOUS.
1. Reason for the Job
__________________
Self Explanatory
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific circuit breaker(s) safety clip(s) No specific platform 3 m (9 ft. 10 in.)
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied
from the External Power 29-10-00-864-001 Depressurize the Green Hydraulic System 29-10-00-864-002 Depressurize the Yellow Hydraulic System 29-10-00-864-003 Depressurize the Blue Hydraulic System 52-41-21-010-001 49-32-00-991-001 Fig. 601
3. Job Set-up
__________ Subtask 49-32-00-860-050
A. Aircraft Maintenance Configuration
(1)
Put the warning notices on panel 25VU to tell persons not to start the APU.
(2)
Energize the ground service network (Ref. TASK 24-41-00-861-002).
(3)
Make sure that the hydraulic systems are depressurized (Ref. TASK 29-10-00-864-001), (Ref. TASK 29-10-00-864-002) and (Ref. TASK 29-10-00-864-003).
Subtask 49-32-00-865-052
B. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41
Subtask 49-32-00-010-051
C. Get Access
(1)
Put the platform below the APU access doors.
(2)
Open the APU access doors 315AL, 316AR and safety them in the open position (Ref. TASK 52-41-21-010-001).
(3)
Set the light switch 11LJ on.
4. Procedure
_________
(Ref. Fig. 601/TASK 49-32-00-991-001)
Subtask 49-32-00-790-050
A. Visual Check of the APU Fuel Distribution Sytem for Condition and
Security
(1)
APU Fuel Pipes.
(a)
Examine the fuel pipe between the Fuel Control Unit (FCU) and the Flow Divider for damage and signs of leakage.
(b)
Examine the supply and return lines from the pressure regulator of the FCU to the servo valves of the IGV and BCV for damage and signs of leakage.
(c)
Examine the fuel pipes from the Flow Divider to the Pilot Fuel and Main Fuel Manifold for damage and signs of leakage.
(d)
Examine the Fuel Drain Pipes from the:
-flow divider to the Exhaust System
-Combustion-Chamber Drain Valve to the APU Drain Collector
-FCU (pump shaft seal) to the APU Drain Collector
-BCV (actuator seal) to the APU Drain Collector
-IGV (actuator seal) to the APU Drain Collector for damage and signs of leakage.
(2)
Fuel Control Unit.
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