ch-47d auxiliary power unit. terminal learning objective (tlo) action : describe components,...
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CH-47D Auxiliary CH-47D Auxiliary Power UnitPower Unit
Terminal Learning Objective Terminal Learning Objective (TLO)(TLO)
ActionAction: : Describe components, operational Describe components, operational characteristics, functions, restrictions and characteristics, functions, restrictions and limitations of the CH-47D Auxiliary Power Unit limitations of the CH-47D Auxiliary Power Unit (APU)(APU)
ConditionCondition: : In a classroom, given a student In a classroom, given a student handouthandout
StandardStandard: : Correctly answer in writing, Correctly answer in writing, without reference, three of four questions, without reference, three of four questions, pertaining to Components, Operational pertaining to Components, Operational Characteristics , Limitations, Functions, and Characteristics , Limitations, Functions, and Malfunctions of the CH-47D APU, In Malfunctions of the CH-47D APU, In Accordance With (IAW) TM 1-1520-240-10 and Accordance With (IAW) TM 1-1520-240-10 and the student handoutthe student handout
Terminal Learning Objective Terminal Learning Objective (TLO) (Cont)(TLO) (Cont)
Safety RequirementsSafety Requirements: : NoneNone Risk AssessmentRisk Assessment: : LowLow Environmental ConsiderationEnvironmental Consideration: : NoneNone EvaluationEvaluation: : Each student will be Each student will be
evaluated on this block of instruction evaluated on this block of instruction during the written examination. This during the written examination. This will be a criterion type examination will be a criterion type examination requiring a requiring a GOGO on each scored unit. on each scored unit. You will have 90 minutes for the exam You will have 90 minutes for the exam
Learning Step/Activity (LSA) Learning Step/Activity (LSA) #1#1
1. Describe operational characteristics, of the 1. Describe operational characteristics, of the Auxiliary Power Unit (APU) ComponentsAuxiliary Power Unit (APU) Components
General CharacteristicsGeneral Characteristics Model T-62T-2BModel T-62T-2B Manufactured by Manufactured by
TurbomachTurbomach Consumes 90 PPHConsumes 90 PPH Rated Power 95 SHPRated Power 95 SHP Weight 74.8 W/O Weight 74.8 W/O
GeneratorGenerator Single stage centrifugal Single stage centrifugal
compressor/PTcompressor/PT Mounted at Sta. 600 Mounted at Sta. 600
Above the rampAbove the ramp
APU Mounting PointsAPU Mounting Points
Mounts:Mounts: Two forward and two rigid Two forward and two rigid links links APU to rotate downAPU to rotate down
Provide:Provide: Vertical and lateral supportVertical and lateral support
APU System ComponentsAPU System Components
APU Start Accumulator APU Start Module
Motor/Pump
Auxiliary Power Unit
APU Fuel Shutoff Valve
APU Electronic Sequence Unit
APU Fuel Boost Pump
APU Fault Relay
Master Caution Panel
Overhead Panel
APUGenerator
Solenoid Valve
APU AssemblyAPU Assembly
Learning Step/Activity Learning Step/Activity (LSA) #2(LSA) #2
1. Describe1. Describe Principles of Operational Principles of Operational for the APUfor the APU
Sections of the APUSections of the APU
Reduction Drive AssemblyPower Turbine Assembly
Air Inlet, and Compressor Assembly
Compressor SectionCompressor Section
Type:Type: Single stage centrifugal-flow Single stage centrifugal-flow (impeller) (impeller) Air drawn in through the inletAir drawn in through the inlet
Combustor AssemblyCombustor Assembly
Provides: Intake of ambient air to the Provides: Intake of ambient air to the compresscompress
Protects: APU against FOD ingestionProtects: APU against FOD ingestion
Power Turbine SectionPower Turbine Section
Type: Impeller turbine rotorType: Impeller turbine rotor Secured: Aft end of the turbine assembly Secured: Aft end of the turbine assembly
Reduction Gear AssemblyReduction Gear Assembly
Purpose:Purpose: Reduces power turbine shaft Reduces power turbine shaft rotational speedrotational speed Three mounting padThree mounting pad
APU Start AccumulatorAPU Start Accumulator
Mounted: Mounted: Sta.555 R/H Ramp Sta.555 R/H Ramp AreaArea
Purpose: Purpose: Stores Hydraulic FluidStores Hydraulic Fluid APU StartAPU Start Emergency Use:Emergency Use:
Utility Sub-SystemUtility Sub-System Indicator: Indicator: 3,0003,000 PSI PSI
APU Start ModuleAPU Start Module Located:Located:
Sta.584 R/H side Sta.584 R/H side ramp arearamp area
Directs:Directs: Signal PressureSignal Pressure APU AccumulatorAPU Accumulator
Controls:Controls: Operating Mode:Operating Mode:
APU APU Motor/PumpMotor/Pump
Indicator:Indicator: 3,000 PSI3,000 PSI
APU Motor/PumpAPU Motor/Pump
Mounted:Mounted: Forward Portion Forward Portion
APUAPU
Function:Function: MotorMotor
Drives APU Drives APU (Starting)(Starting)
PumpPump Supplies 3350 Supplies 3350
PSIPSI Engine StartersEngine Starters Utility Sub-Utility Sub-
SystemsSystems
Airframe Mounted Fuel Airframe Mounted Fuel Boost PumpBoost Pump
Type: Rotary vane pumpType: Rotary vane pump Supplies: 7−40 PSI to the APU driven Supplies: 7−40 PSI to the APU driven
fuel pumpfuel pump Energized:Energized:
APU start switch RUN positionAPU start switch RUN position
Pressure Fluid FilterPressure Fluid Filter
Type: Paper filter elementType: Paper filter element Mounted: Top of the reduction drive Mounted: Top of the reduction drive
assembly assembly
APU Fuel ControlAPU Fuel Control
Fuel ManifoldFuel Manifold
Constructed:Constructed: Metal fuel lineMetal fuel line
Six bosses equally spacedSix bosses equally spaced
Start Fuel Nozzle Start Fuel Nozzle AssemblyAssembly
Mounted:Mounted: Combustor housing at approx. 7 O’clock Combustor housing at approx. 7 O’clock positionposition
Purpose: Sprays fuel directly in front of the spark Purpose: Sprays fuel directly in front of the spark plug plug
APU Electrical SystemAPU Electrical System
Battery SwitchBattery Switch Two positionTwo position
APU SwitchAPU Switch Three positionThree position
APU GEN switchAPU GEN switch Two positionTwo position
Magnetic PickupMagnetic Pickup
Ignition Exciter BoxIgnition Exciter Box
Mounted: Upper R/H Mounted: Upper R/H side of the turbineside of the turbine
Purpose: Convert DC Purpose: Convert DC input to high energy input to high energy AC AC
Event/Time MeterEvent/Time Meter
Purpose:Purpose: Tracks starts on the rotor Tracks starts on the rotor
assembly assembly Tracks APU operational time Tracks APU operational time
APU Oil SystemAPU Oil System
Oil SumpOil Sump
Oil FilterOil FilterOil Pressure SwitchOil Pressure Switch
Manual Shutoff ValveManual Shutoff Valve
Located: Sta.540 L/H side of ramp areaLocated: Sta.540 L/H side of ramp area Purpose: Shut down the APU during an emergency Purpose: Shut down the APU during an emergency
Electronic Sequence Unit Electronic Sequence Unit (ESU)(ESU)
Located: Sta.585 L/H sideLocated: Sta.585 L/H side Purpose:Purpose:
Sequences the start procedure of the APUSequences the start procedure of the APU Continuously monitors the APU operationContinuously monitors the APU operation
Contains: Four BITE latches for fault Contains: Four BITE latches for fault
indicationsindications
BITE InformationBITE Information
New Modification (ESU)New Modification (ESU)
Learning Step/Activity Learning Step/Activity (LSA) #3(LSA) #3
1. Describe Start Procedures, 1. Describe Start Procedures, Operational Restrictions and Operational Restrictions and Emergency Procedures of the Emergency Procedures of the APUAPU
Start ProceduresStart Procedures
Start ProceduresStart Procedures
Three Positions Three Positions SwitchSwitch OffOff RunRun StartStart
Place switch to Place switch to RUNRUN for for 3-5 3-5 secondsseconds
Move switch to Move switch to STARTSTART for for 22 seconds and release seconds and release to to RUNRUN
Master Caution/Advisory Master Caution/Advisory PanelPanel
APU Operational APU Operational RestrictionRestriction
Tail in the wind!!!Tail in the wind!!!APU Exhaust
The APU shall not be started with a tail wind in excess of 25 knots
APU FireAPU Fire
APU switch – OFF.APU switch – OFF. ABORT START.ABORT START.
Pg: 9-1-22Pg: 9-1-22
Emergency Procedures
Check On LearningCheck On Learning What two components are driven by the What two components are driven by the
APU?APU? Motor/Pump and GeneratorMotor/Pump and Generator
How long should you wait before attempting How long should you wait before attempting a restart on the APU?a restart on the APU? 1 Minute1 Minute
If the APU ON caution light fails to comes If the APU ON caution light fails to comes ON, what should you do?ON, what should you do? Record the BITE information on 2408-13Record the BITE information on 2408-13
What is the maximum tailwind for starting What is the maximum tailwind for starting the APU?the APU? 25 knots 25 knots
SummarySummary
Have a nice dayHave a nice dayand and
Safe Flying!Safe Flying!