Transmission System Flashcards
The main function of the transmission system is to ____________________.
take the combined power from the two engines, reduce the rpm, and transfer it to the main and tail rotors.
The secondary function of the transmission system is to _______________.
provide a drive for electrical and hydraulic power generation.
The tail driveshaft consists of ___ sections with a ________ at the fold hinge.
6, disconnect coupling
The tail rotor shafts are ______ and suspended at four points by _____.
ballistically tolerant, viscous-damped bearings
The MGB is of a _____ design with a built-in __ degree forward tilt.
modular design, 3
The rotor brake is toothed to provide ___________.
the means for positioning the main rotor head for blade folding.
Each of the input modules contains ______ and ______.
input bevel-pinion gear and free wheeling unit
The freewheeling unit allows each engine to be disengaged from the transmission when ____________.
Nr exceeds Np (autorotation)
The engine output shaft provides drive from the engine to the input module via the ______.
diaphragm coupling
The diaphragm coupling is designed to ___________________.
allow for slight angular or axial misalignment of the engine output shaft during operation.
If _____________during rotor engagement, shut down the engine immediately. Whining noise may be an indication of a pending ________. Do not operate engine until appropriate troubleshooting has been performed to locate the source of the whining noise. If incorrect installation of diaphragm coupling is the source of the whining noise, further engine operation could result in diaphragm coupling failure.
an abnormal or loud whining noise is heard, diaphragm coupling failure
Caution: A loud or abnormal whining noise may be an indication of __________.
a pending diaphragm coupling failure
Each accessory module provides mounting for ___________.
an ac electrical generator and hydraulic pump module
Which sensors are located on the right and left accessory modules?
An Nr sensor for the vertical instruments is mounted on the right accessory module. The Nr sensor for the TDI and main transmission low-oil pressure sensors are mounted on the left accessory module.
How are the intermediate and tail gearboxes lubricated?
The are splash-lubricated
The TGB enables pitch changes of the tail rotor blades through the flight control system and has a __________.
built-in 20 degree left tilt
What type of lubrication system does the main transmission system have?
an integral wet sump lubrication system
The _______ also use transmission oil for cooling
ac generators on the accessory modules
The transmission oil impending bypass PDI is located _______.
above the sonobouy launcher
An extended PDI is an indication that ________. It is not ______.
maintenance action is required after the last flight of the day. It is not a lubrication system malfuntion.
________ is required to reset the transmission oil impending bypass PDI.
Replacement of the filter
The oil cooler uses a _____, driven by the _____, to cool the oil before it enters the various modules.
blower, rotor driveshaft
Where is the oil pressure sensor (caution) located and why? When is it activated?
It is located on the No. 1 accessory module, which is the farther point from the pumps. Activated when main transmission oil pressure drops below 14 PSI.
Pressure readings for the vertical instrument are taken at the _________.
MGB manifold inlet
The main transmission oil temperature HOT caution is activated when:
main transmission oil temp goes above 117 degrees C
Where is temperature for the vertical instruments sensed?
in the sump using a temperature sensor that is embedded in the main module sump chip detector.
The main transmission chip detector system consists of ____ chip detectors.
5
Where are all the chip detectors located?
Accessory chip detectors: in the return lines of the No 1 and No 2 accessory modules
Input module and main module chip detectors: in the main module
How do the chip detectors work?
The chip detectors are magnetic plus that attract ferrous material. When a metal fragment completes the circuit, the appropriate caution will appear.
Each chip detector has a _______, to eliminate false warnings created by fuzz and minute particles. This will deactivate when oil temperature is above _______.
burn-off feature, 140 degrees F
How does the chip detector in the main module work?
It rests at the lowest point of the oil system, contains an embedded temperature sensor, and incorporates at 30-second delay to further eliminate false warnings.
How are the IGB and TGB chip detectors different from the main ones?
They contain an embedded oil temperature switch
