CH-47D%20Auxiliary%20Power%20Unit

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CH-47D Auxiliary Power Unit
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Terminal Learning Objective (TLO)

• Action Describe components, operational
  characteristics, functions, restrictions and
  limitations of the CH-47D Auxiliary Power Unit
  (APU)
• Condition In a classroom, given a student
  handout
• Standard Correctly answer in writing, without
  reference, three of four questions, pertaining to
  Components, Operational Characteristics ,
  Limitations, Functions, and Malfunctions of the
  CH-47D APU, In Accordance With (IAW) TM
  1-1520-240-10 and the student handout

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Terminal Learning Objective (TLO) (Cont)

• Safety Requirements None
• Risk Assessment Low
• Environmental Consideration None
• Evaluation Each student will be evaluated on
  this block of instruction during the written
  examination. This will be a criterion type
  examination requiring a GO on each scored unit.
  You will have 90 minutes for the exam

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Learning Step/Activity (LSA) 1

• 1. Describe operational characteristics, of the
  Auxiliary Power Unit (APU) Components

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General Characteristics

• Model T-62T-2B
• Manufactured by Turbomach
• Consumes 90 PPH
• Rated Power 95 SHP
• Weight 74.8 W/O Generator
• Single stage centrifugal compressor/PT
• Mounted at Sta. 600 Above the ramp

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APU Mounting Points

• Mounts Two forward and two rigid links
• APU to rotate down
• Provide Vertical and lateral support

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APU System Components
Solenoid Valve
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APU Assembly
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Learning Step/Activity (LSA) 2
1. Describe Principles of Operational for the APU
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Sections of the APU
Power Turbine Assembly
Reduction Drive Assembly
Air Inlet, and Compressor Assembly
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Air Inlet Section
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Compressor Section

• Type Single stage centrifugal-flow (impeller)
• Air drawn in through the inlet

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Combustor Assembly

• Provides Intake of ambient air to the compress
• Protects APU against FOD ingestion

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Power Turbine Section

• Type Impeller turbine rotor
• Secured Aft end of the turbine assembly

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Reduction Gear Assembly

• Purpose Reduces power turbine shaft rotational
  speed
• Three mounting pad

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APU Start Accumulator
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APU Start Accumulator

• Mounted Sta.555 R/H Ramp Area
• Purpose Stores Hydraulic Fluid
• APU Start
• Emergency Use
• Utility Sub-System
• Indicator 3,000 PSI

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APU Start Module

• Located
• Sta.584 R/H side ramp area
• Directs
• Signal Pressure
• APU Accumulator
• Controls
• Operating Mode
• APU Motor/Pump
• Indicator
• 3,000 PSI

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APU Start Module
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APU Motor/Pump

• Mounted
• Forward Portion APU
• Function
• Motor
• Drives APU (Starting)
• Pump
• Supplies 3350 PSI
• Engine Starters
• Utility Sub-Systems

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APU Motor/Pump
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APU Fuel System
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Airframe Mounted Fuel Boost Pump

• Type Rotary vane pump
• Supplies 7-40 PSI to the APU driven fuel pump
• Energized
• APU start switch RUN position

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APU Fuel solenoid Valve

• Mounted Boost pump
• Normally closed, electrically opened valve
• Purpose Stops fuel flow to the APU

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Pressure Fluid Filter

• Type Paper filter element
• Mounted Top of the reduction drive assembly

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APU Fuel Control
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APU Fuel Pump
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Fuel Manifold

• Constructed Metal fuel line
• Six bosses equally spaced

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Start Fuel Nozzle Assembly

• Mounted Combustor housing at approx. 7 Oclock
  position
• Purpose Sprays fuel directly in front of the
  spark plug

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APU Electrical System

• Battery Switch
• Two position
• APU Switch
• Three position
• APU GEN switch
• Two position

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Magnetic Pickup
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Ignition Exciter Box

• Mounted Upper R/H side of the turbine
• Purpose Convert DC input to high energy AC

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Event/Time Meter

• Purpose
• Tracks starts on the rotor assembly
• Tracks APU operational time

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APU Oil System
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APU Oil System
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Oil Sump
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Oil Pump
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Oil Filter
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Oil FilterOil Pressure Switch
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Manual Shutoff Valve

• Located Sta.540 L/H side of ramp area
• Purpose Shut down the APU during an emergency

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APU Fault Relay
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Electronic Sequence Unit (ESU)

• Located Sta.585 L/H side
• Purpose
• Sequences the start procedure of the APU
• Continuously monitors the APU operation
• Contains Four BITE latches for fault indications

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BITE Information
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New Modification (ESU)
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Learning Step/Activity (LSA) 3

• 1. Describe Start Procedures, Operational
  Restrictions and Emergency Procedures of the APU

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Start Procedures
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APU Control Switch
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Start Procedures

• Three Positions Switch
• Off
• Run
• Start
• Place switch to RUN for 3-5 seconds
• Move switch to START for 2 seconds and release to
  RUN

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Master Caution/Advisory Panel
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APU Operational Restriction
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Tail in the wind!!!
APU Exhaust
The APU shall not be started with a tail wind in
excess of 25 knots
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APU Fire
Pg 9-1-22
Emergency Procedures

• APU switch OFF.
• ABORT START.

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Any Question?
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Check On Learning

• What two components are driven by the APU?
• Motor/Pump and Generator
• How long should you wait before attempting a
  restart on the APU?
• 1 Minute
• If the APU ON caution light fails to comes ON,
  what should you do?
• Record the BITE information on 2408-13
• What is the maximum tailwind for starting the
  APU?
• 25 knots

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Summary
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Have a nice dayand Safe Flying!
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Engine Shutdown With APU or APU Generator
Inoperative
Page 9-1-20
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