Systems Flashcards
Detection
- 5 radiation-sensing flame detectors(2 in engine compartments, 1 in APU compartment)
- Reacts to infared radiation
- System resets itself when infared goes away
Extingushing
- two-shot, main and reserve capability
- system has a thermal discharge safety port that will cause a visual indicator on the right side of
the fuselage to rupture, indicating that one or both containers have discharged overboard - Each engine compartment contains three discharge nozzles, two inboard, one forward outboard. inboard only has one
Extinguishing Warning
Shut off #2 ENG first. You cant discharge fire ext agent into No2 engine without AC power.
Extinguishing Notes
- FIRE EXTG SW only works after you pull EMER OFF/APU T HANDLE
- Crash actuated system, 10Gs or more and fire extg a gent goes into both eng compartments
Four sections
Cold, Hot, Power Turbine, Accessory
Cold section
IPS, Compressor, Output shaft, Line Replaceable Units
IPS, Compressor, Output shaft, Line Replaceable Units
- IPS - Removes foreign material from eng inlet air
- Compressor - 5 axial stages, 1 centrifugal stage
+ Pressurizes combustion chamber
+ Cools hot section components
+ Provides bleed air, 3 ports (Anti-Ice start bleed valve, pneumatic system, engine inlet anti-ice
+ Output shaft assembly -houses the high speed shaft that connects input module to the main XMSN. - LRUs - Line replaceable units
+ DEC - Digital Engine Control
+ anti-ice/start bleed valve
+ History Counter
+ Ignition system, electrical cables
Hot Section Module
Sub-assemblies:
Gas generator (GG) turbibne
Stage 1 nozzle assembly
Combustion liner.
LRUs on the hot section are 701C ignitors
Power Turbine Section Module
2-stage power turbine, exhaust frame, drive shaft
assembly, and the C-sump housing.
LRUs on power turbine section - thermocouple
harness, torque and overspeed sensor, NP sensor (% RPM1 or 2)
Power turbine, thermocouple harness
- Power turbine converts gas pressure into rotational shaft energy
- thermocouple harness - 7 thermocouple probes measure temp of gases between Ng & Np
turbine sections FEED it to DEC for TGT LIMITING & signal TGT temp to be displayed on CDU
Accessory Section Module
Includes the top mounted accessory gear box (AGB) and a number of LRUs.
LRUs: hydromechanical unit (HMU) 701C 701D/CC overspeed and drain valve (ODV) starter engine driven fuel boost pump oil filter oil cooler alternator oil and scavenge pump IPS blower fuel filter assembly chip detector oil filter bypass sensor liquid to liquid cooler oil temperature sensor fuel pressure sensor oil pressure sensor
Hydromechanical Unit (HMU)
- mounted to and driven by the AGB
- Various parameters are sensed by the HMU and
influence fuel flow, variable geometry position, and engine AISBV operation - Fuel from the HMU flows to 701C ODV
HMU Purposes (PM CAN VETO)
PM CAN VETO Pumps fuel (high pressure) Meters fuel (in response to LDS,PAS,ECU)
Collective pitch compensation (
HMU Purposes (PM CAN VETO)
PM CAN VETO
Pumps fuel (high pressure) Meters fuel (in response to LDS,PAS,ECU)
Collective pitch compensation (collective cause imm response) Accel/Decel fuel flow LIMITING (prevents compressor stall from large power changes) Ng Limiting (Limits MTA @ low temps)
Variable Geometry (position of guide vanes) ECU Lockout (PAS override control, bypass TQ Mtr) Torque Motor (trim NG output, fine tune eng output, override through lockout) Open Vapor Vents (for manual HMU priming, remove air from HMU)
HMU Purposes (PM CAN VETO)
PM CAN VETO
Pumps fuel (high pressure) Meters fuel (in response to LDS,PAS,ECU)
Collective pitch compensation (collective cause imm response) Accel/Decel fuel flow LIMITING (prevents compressor stall from large power changes) Ng Limiting (Limits MTA @ low temps)
Variable Geometry (position of guide vanes) ECU Lockout (PAS override control, bypass TQ Mtr) Torque Motor (trim NG output, fine tune eng output, override through lockout) Open Vapor Vents (for manual HMU priming, remove air from HMU)
