(2)
Solution anneal if required by manual.
(3)
Hand abrade area to be weld repaired if required by manual.
(4)
Wipe area clean with methanol or other suitable solvent.
(5)
Weld in accordance with AMS-W-5018 using filler rod as specified by process engineer.
(6)
Hand finish weld area to blend if required by manual.
(7)
Penetrant inspect if required by manual.
(8)
Pressure test if required by manual.
(9)
Radiographic inspect if required by manual.
(10)
Age as applicable if required by manual.
(11)
Re-nondestruct test if aged.
(12)
Remachine as applicable to manual requirements.
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(13)
Deburr.
(14)
Visually inspect.
12. Balancing Procedures and Guidelines
A. Method No. 412A: Turbine Wheel Assembly Balance Check and Re-balance
Check and rebalance the turbine wheel assembly as follows:
NOTE: Some starters require painting of parts of turbine wheel assemblies. Paint, as required, using aluminum silicone paint (Dutch Boy No. 5542) (SECTION VII) prior to balancing.
(1)
Install turbine wheel assembly in adapter specified in applicable manual. Place adapter and turbine wheel assembly in a balancing machine (SECTION VII). Determine class of balancing to be performed. (Refer to Method No. 412C.)
(2)
Mark consecutive numbers opposite each vane or inner flat surface of turbine wheel with industrial marking ink (Violet, No. 127-1/2) (SECTION VII). Adjust strobe lamp to illuminate numbers.
NOTE: Do not vary rpm of wheel when checking for imbalance. Speed selected shall be used for each check.
(3)
Using jet or belt drive as specified in applicable manual, rotate turbine wheel assembly at approximately 600 to 1800 rpm. Balance shall be as specified in applicable manual.
(4)
If turbine wheel assembly is not within balance requirements, stop turbine wheel and place clay opposite numbered areas indicating excessive weight and imbalance. Adjust clay to obtain balance within specified limits.
(5)
Remove turbine wheel assembly from balancing machine. Cover shaft of turbine wheel assembly to protect from metal particles and remove metal from surfaces specified in applicable manual, as required to bring turbine wheel assembly into balance. Finish affected rework surfaces to 32 microinches (0,8128 micrometers) or better with corner radii no sharper than 0.015 inch (0,0381 mm).
(6)
Remove clay. Reinstall turbine wheel assembly in balancing machine and recheck balance at same rpm used in Step (3). Continue procedure until turbine wheel assembly is within balance limits.
(7)
Remove turbine wheel assembly from balancing machine and spot treat reworked areas as specified in applicable overhaul manual for unit in work.
WARNING: SOLVENT VAPORS ARE TOXIC AND FLAMMABLE. DO NOT INHALE VAPORS. OBSERVE FIRE PRECAUTIONS.
(8)
Remove industrial marking ink numbers with solvent (Federal Specification P-D-680, Type I) (SECTION VII). If applicable, retouch reworked areas using aluminum silicone paint (Dutch Boy No. 5542) (SECTION VII). Recheck that balance is still maintained.
(9)
Remove turbine wheel assembly from adapter. Tag turbine wheel assembly as a balanced part and place in a protected area until required for re-assembly.
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B. Method No. 412B: Rotor Assembly Balance Balance rotor assemblies as follows:
(1)
Place rotor assembly in an insert specified in applicable manual and install in a standard balancing machine (SECTION VII).
(2) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：标准施工手册 STANDARD PRACTICES MANUAL 20-00-02/70-00-01(87)
