Powertrain Flashcards
Which transmissions do not have auxiliary lubrication system?
Engine XSMN
How can you identify low oil pressure in the aft vertical shaft?
Maintenance Panel and WCA
What indications will the crew have when a debris screen is bridged with conductive particles?
Debris indication on EICAS, Maintenance Panel, and WCA
The _____ lubrication system lubricates the main generators.
AFT XSMN Main
What should you do if you find an engine or combining transmission oil quantity indication low and the aircraft has been shutdown for more than 30 minutes?
5 min Ground Test then recheck
What is the purpose of the 9 and 4 degree tilt in the fwd and aft transmissions?
Aids in Ground Handling and Ground Taxiing.
What is the location of the temperature/thermal switch that turns on the ENG 1 or ENG 2 XSMN warning?
Bottom of the ENG XSMN
The fluid levels in the combining and engine transmissions should be checked within ____ minutes after engine shutdown.
30
Why must you reduce the electrical load if the AFT XSMN OIL HOT caution light is active?
Aft XSMN main lubrication system lubricates and cools generators
What will happen if the maintenance panel is tested in-flight?
Same as ground
What is the emergency procedure for the ENG1 or ENG2 XSMN warning active?
-EMER ENG SHUTDOWN
-[F] Affected ENG XMSN- Check
LAND AS SOON AS POSSIBLE
How many synchronizing drive shafts are installed on the CH-47?
9 (7 FWD,2 AFT)
Exceeding VNE with the LCT retracted places excessive stress on what component?
Thrust Bearing
What items in the drive-train system allows the shaft assemblies to flex?
Layered Steel Plates
(Flex-couplings)
What reduces vibrations between drive shafts and the aircraft?
Lord Mounts/Elastomer Shock Mounts
The quill shafts are located where?
Between the engines and their repsective transmissions
What is displayed if the pressure in an ENG XMSN is greater than 90 psi?
ENG1 or ENG2 XSMN PRESS HI advisory
What temperature does the ENG1, ENG2, FWD, COMB, and AFT XSMN OIL HOT cautions become active?
140 deg C
Where is the cooling air drawn in through for the FWD XMSN oil cooler?
Air inlet duct around the synchronizing shaft on the rear of the FWD XMSN
What is the purpose of the Power Train system?
To transmit the power from the engines to the rotors
What temperature does the ENG1 or ENG2 XSMN warning become active?
190 deg C
How many transmission are in the Power Train system?
5
When the engine transmission filter differential pressure indicator extends, can the button be reset at the time?
No
When the COMB XSMN OIL HOT caution is displayed, how is the POWER TRAIN page temperature indication displayed?
Red
The left oil pump on the combining XSMN is used for which transmissions?
COMB XSMN main system and the #1 ENG XSMN
At what psi does the maintenance panel MAIN PRESS LO indicator illuminate?
When pressure drops below 20 psi
What drives the forward XMSN oil cooler fan?
Transmission driven
What automatically eliminates nuisance chip indicator lights caused by minute particles in the transmission oil system?
Fuzz Burn-off System
The aft transmission cooler is located where?
Rear of the AFT XSMN (shaft driven fan)
The AFT XSMN main filter bypass visual indicator must be installed how?
Within 30 deg of vertical, and at the top of the filter housing
What components are NOT lubricated by the aft transmission auxiliary lubrication system?
Generators and aft shaft
Describe the combining transmission lubrication system.
Consists of a left and right pump.
Left-lubricates Eng 1 XMSN and serves as primary lubrication for COMB XMSN
Right- lubricates Eng 2 XMSN and serves as auxiliary lubrication for COMB XMSN. The right pump assembly is not routed through a cooler
General Rule: Name for component that gives Oil Temp Readout and Caution
Probe and Switch
General Rule: Name for component that does Oil Pressure Readout and the Oil Pressure Caution
Transmitter/Transducer and Pressure Switch (shiny)
Where is the transmission temp caution measured at and where is the engine transmission warning measured at
Caution: 140° C at Reservoir
Warning: 190° C at Eng Transmission (Eng XSMN Thermoswitch)
Is the fuzz burn-off module attached to any debris screens?
No, only chip detectors
Where is the cooling air drawn in through for the forward transmission oil cooler?
Air is drawn through the air inlet duct around the synchronizing shaft
what drives the forward oil cooler fan
the transmission/ No.1 drive shaft
where is the aft transmission oil cooler
moiunted between the main generators on the aft section
the aft transmission main oil pump supplies oil to which components on the aft transmission
aft XMSN gears and bearings, aft vertical shaft thrust bearing and the main AC generators
the aft transmission main filter bypass visual indicator must be installed how
within 30° of vertical, and at the top of the filter house
Exceeding VNE with the LCT retracted places excessive stress on what component
Thrust Bearing
