Engine Flashcards
How are pilot commands translated to engine response?
-1 Section 1
Functionality
Through the PAS and LDS inputs to the HMU. They are connected to the PCLs and the Collective respectively.
What is the primary function of the EDECU?
-1 Section 1
Functionality
- Provide Q matching/load sharing
- TGT limiting
- NP governing
- NP overspeed protection (sensing)
- HSP (sensing)
How does the oil system work?
-1 Section 1
Functionality
Oil is kept in reservoirs and bleeds slowly out of those reservoirs to be atomized by air jets, providing continuous oil mist lubrication for the bearings.
What feature is implemented to help the oil in cold weather?
-1 Section 1
Functionality
An impending bypass indicator has a thermal lockout below 38 degrees C to prevent the button from popping in cold weather.
What is the “I’m a drop of fuel” flow?
-1 Section 1 (chart)
Physical Orientation
From the tanks (duh)
Engine driven suction pump
Fuel pressure sensor
Fuel filter
HMU
Oil Cooler
ODV
Fuel injectors
Why do we care about the kind of pump that the engine uses for fuel?
-1 Section 1
Functionality
It’s a low pressure suction engine driven boost pump which assures that the airframe fuel supply system is under negative pressure, thus lessening the potential of fire in case of fuel system damage.
What is really causing filter buttons to pop?
-1 Section 1
Functionality
Pressure differential
What is the HMU’s job?
-1 Section 1
Functionality
Control the fuel to ODV for combustion
What does the HMU do?
-1 Section 1
Functionality
Pumps fuel at high pressure
Meters fuel to the ODV (fuel flow)
Positions AISBV
Positions variable guide vanes
What does the ODV do?
-1 Section 1
Functionality
Purges fuel on shutdown
Primes fuel on startup
Shuts of fuel in NP overspeed sensed by EDECU
Shuts of fuel if hot start sensed by EDECU
How does the starter disengaged? What does this prevent? On a normal start
-1 Section 1
Functionality
It has an overrunning clutch which disconnects the starter output shaft from the gear box when the gear box speed exceeds the starter’s speed.
It prevents the starter from being driven by the engine.
How can we manually disengage the starter?
-1 Section 1
Functionality
Pull down on the PCL
Hoe do you abort a start?
-1 Section 1
- Pull down on the PCL
- Press the secondary latch release
- Move PCL to OFF
What do you do if we accidnetlaly tried to start with the ignition keylock OFF?
-1 Section 1
- Do not turn the keylock ON after motoring has started (to prevent a hot start)
- Abort start procedures
Can we do a dual engine start with the APU?
-1 Section V
OpsLimits
Yes, there’s a chart for that though. It depends on the OAT and PA.