Transmission Flashcards
NATOPS Chap 2
Transmision System
The primary 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”
NATOPS Chap 2
Transmision System
The secondary function of the transmission is?
“to provide a drive for electrical and hydraulic power generation”
NATOPS Chap 2
Transmision System
What does the transmission power train consist of?
Main transmission modules, tail rotor drive shaft, oil cooler, intermediate gearbox, and tail gearbox.
NATOPS Chap 2
Transmision System
How many sections does the tail drive shaft consist of?
It consists of 6 sections with a disconnect coupling at the fold hinge. The shafts are ballistically tolerant and suspended at four points by viscous damped bearings. The oil cooler is an integral part of the tail rotor drive shaft system
NATOPS Chap 2
Transmision System
What are the 5 modules the Transmission consists of?
Two accesory modules, two input modules, and one main module (this has a 3* forward tilt).
NATOPS Chap 2
Transmision System
Where is the Util hydraulic pump located
on the right rear quadrant of the main transmission
NATOPS Chap 2
Transmision System
Describe the oil system of the main gearbox…
“pressure lubricated with a oil sump, oil filter, oil temp/px/chip indication systems”
NATOPS Chap 2
Transmision System
What do the Input modules contain?
input bevel-pinion gear and a freewheeling uint. The Freewheeling unit allows each engine to be disengaged from the transmission when Nr exceeds Np. The Input Module provides the first gear reduction between the engine and the main module
NATOPS Chap 2
Transmision System
What connects the engine and the input mod?
The diaprahgm coupling connects the two and allows for slight angular or axial misalignment of the engine output shaft during operation
NATOPS Chap 2
Transmision System
What are attached on the Accessory Mods
The accessory mods provide mounting for hydraulic pumps, generators, and Nr tachometer (#2 side), Low oil px sensor and TDI (#1 side)
NATOPS Chap 2
Transmision System
How are the Intermediate and tail gearbox lubricated?
Splash type
NATOPS Chap 2
Transmision System
Main Tranmission lubrication system incorporates…
“integral wet sump lubrication system that provides: cooled, filtered oil to all bearings and gears.”
NATOPS Chap 2
Transmision System
What also uses cooled transmission oil?
both generators
NATOPS Chap 2
Transmision System
MAIN XMSN OIL HOT advisory
Oil temp is > 105 and OIL HOT caution is not activated
NATOPS Chap 2
Transmision System
XMSN Px LOW advisory
Oil Px is <= 30psi, Nr is >= 25%, and XMSN Px low caution is not activated
