ICA-D212-725 (63)
Page 32 of 144
CHAPTER 63 – MAIN ROTOR DRIVE SYSTEM (63-00-00)
COPYRIGHT
2007 BY DART AEROSPACE LTD.
THIS DOCUMENT IS PRIVATE AND CONFIDENTIAL AND IS SUPPLIED ON THE EXPRESS CONDITION THAT IT IS NOT TO BE USED FOR ANY PURPOSE OR COPIED OR COMMUNICATED TO ANY
OTHER PERSON WITHOUT WRITTEN PERMISSION FROM DART AEROSPACE LTD.
Revision:
6
Date: 13.08.26
63.4.5 Maintenance
63.4.5.1 Removal
SPECIAL TOOLS REQUIRED
NUMBER NOMENCLATURE
SWE-13852-20 Stand
T100220
Lifting sling (2)
T101358
Wrench adapter equivalent
T101581 Maintenance
hoist
equivalent
204-040-929-029 or
204-040-929-101
Cover and Lift Plate
Assembly
63.4.5.1.1
When transmission is to be
replaced, accomplish preservation by one of the
following methods:
63.4.5.1.1.1
If helicopter and transmission are
operational, perform a ten minute ground run
FMS-D212-725-1 prior to removal of transmission.
63.4.5.1.1.2
If transmission/engine cannot be
ground run, accomplish the following:
63.4.5.1.1.2.1 Remove mast assembly (2, Figure
63-7) from transmission (paragraph 63.3.2.1).
63.4.5.1.1.2.2 Spray inside of transmission
through top case opening with four quarts of
transmission oil (Chapter 12). Rotate gears by
hand while spraying oil.
63.4.5.1.1.2.3 Install cover and lift plate
assembly (204-040-929-029 or 204-040-929-101)
or mast assembly.
63.4.5.1.2
Open and remove cowling,
fairings, firewalls and baffles as required for
access to transmission, mounts, and driveshafts.
In cabin, remove access doors from both sides
and front of pylon support.
63.4.5.1.3
Disconnect battery and any
external power source. Disconnect transmission
electrical harness at connector on right side of
pylon support.
63.4.5.1.4
Remove No. 1 hydraulic pump
and tachometer generator from drive quill
(paragraph 63.7.5.1). Disconnect No. 2 hydraulic
pump lines and cap fittings (Chapter 29).
63.4.5.1.5 Remove
engine-to-transmission
(main) driveshaft (paragraph 63.2.1.1).
63.4.5.1.6
Disconnect forward tail rotor
driveshaft at both ends, and move shaft clear of
transmission (Chapter 65).
63.4.5.1.7
Drain oil from transmission sump
(Chapter 12).
63.4.5.1.8
Disconnect oil outlet and inlet
hoses.
63.4.5.1.9
Disconnect oil drain line from
sump.
63.4.5.1.10
Disconnect rotor brake hydraulic
hoses and electrical wires, if so equipped.
63.4.5.1.11
Erect T101581 maintenance hoist,
or equivalent.
CAUTION
BEFORE USING T101581 MAINTENANCE
HOIST TO REMOVE OR INSTALL
TRANSMISSION, PLACE A SUITABLE
SUPPORT UNDER TAILBOOM TO STEADY
FUSELAGE IF A TAIL-HEAVY CONDITION
OCCURS.
NOTE
For ease of rotating upper tower of maintenance
hoist, clean pivot tube and Teflon bushings before
each use.
NOTE
Disregard step 63.4.5.1.12 through step
63.4.5.1.14 if mast assembly was removed in step
63.4.5.1.1.2.1.
63.4.5.1.12
Remove main rotor hub and blade
assembly (Chapter 62).
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