TASK 72-21-00-300-025
Angular Distribution for a Replacement of 3 to 18 Pairs of fan Rotor Blades Manual Method
1. Reason for the Job
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Self Explanatory
2. Job Set-up Information
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A. Fixtures, Tools, Test and Support Equipment
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REFERENCE QTY DESIGNATION
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No specific warning notice
No specific access platform 0.5 m (1 ft. 8 in.)
B. Referenced Information
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REFERENCE DESIGNATION
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R 72-21-00-991-331 Fig. 807
3. Job Set-up
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Subtask 72-21-00-941-077
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a warning notice to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
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(b) Put a warning notice to tell persons not to energize the FADEC 1(2).
(4) Put an access platform in position.
4. Procedure
_________ R (Ref. Fig. 807/TASK 72-21-00-991-331) Subtask 72-21-00-350-051
A. Manual Distribution Method.
(1) Put the blades in decreasing order of moment weights. The moment weight of each blade is marked under the blade root.
(2) Temporarily give numbers to the blades from 1 to 36, blade No. 1 is the haviest, blade No. 36 is the lightest.
(3) Make the angular distribution of blades as shown in table of
referenced figure. R (Ref. Fig. 807/TASK 72-21-00-991-331)
(4) Calculate the resulting (static) moment of the imbalance of the blades.
(5) Decrease the calculated resultant to the lowest possible amount. To do this, change the location of the blades as necessary.
NOTE : The moment weight difference between 2 blades 180-degree apart
____ must be kept within 200 g.cm. The resultant moment of imbalance must be less than 80 g.cm.
5. Close-up
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Subtask 72-21-00-869-072
A. Make sure that the work area is clean and clear of tool(s) and other items.
Subtask 72-21-00-942-071
B. Close Access
(1) Remove the access platform(s).
(2) Remove the warning notice(s).
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Angular Distribution and Installation of Blades on Fan Disk R Figure 807/TASK 72-21-00-991-331
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E E May 01/00 E E ECES E NO.1 AND NO.2 BEARING SUPPORT ASSEMBLY - DESCRIPTION AND OPERATION
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1. General
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(Ref. Fig. 001)
A. No. 1 and no. 2 bearing support module
(1) The No. 1 and No. 2 bearing support module is bolted to the fan frame front face and supports both the fan and booster rotor assemblies.
(2) The bearing support consists of the following major parts :
(a) No. 1 bearing support.
(b) No. 1 ball bearing.
(c) No. 2 bearing support.
(d) No. 2 roller bearing.
(e) Oil manifold assembly.
(f) External piping.
(g) Fan shaft.
(h) Forward stationary air/oil seal.
2. Description
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(Ref. Fig. 002, 003, 004, 005)
A. No. 1 Bearing Support (Ref. Fig. 002, 003) The No. 1 bearing support is a titanium weldment. The rear outer flange of the support is bolted to the fan frame. The front flange of the support carries the No. 1 ball bearing housing. The rear inner flange carries the No. 2 bearing support. The outer casing is provided with a flange onto which is attached the No. 1 bearing stationary air/oil seal. The bottom rear of the casing has an orifice providing for oil draining through the fan frame hub. The forward casing has holes for oil and air venting into the No. 1 bearing air/oil seal and from there, to the front engine sump via a vent tube. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM ENGINE 发动机 1(115)
