4. Procedure
_________ (Ref. Fig. 404/TASK 72-21-00-991-303, 405/TASK 72-21-00-991-304) Subtask 72-21-00-420-068
A. Preparation and Installation of the Fan Rotor Blades:
(1) Preparation for Installation of Fan Rotor Blades. CAUTION : THE FAN BLADES ARE KEPT IN NUMERICAL ORDER ON THE STORAGE
_______ STAND AND MUST BE INSTALLED ACCORDINGLY ON THE FAN DISK. BLADE N.1 IS INSTALLED IN FRONT OF THE OFFSET BOLT OF THE FAN DISK. NUMBERS ARE GIVEN COUNTERCLOCKWISE, FORWARD LOOKING AFT.
NOTE : Installation will be easier if the fan disk blade recess into
____ which the blade is to be installed is placed at the 6 O'clock position.
(a) Get the fan blades (80) from STAND, STORAGE - FAN BLADES (856A2631G01).
NOTE : Put the fan disk dovetail slot, where you want to install
____ blade No. 1 at the 6 O'clock position. This will help installation of the blades on the fan disk.
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Installation of the First Fan Blade at 6 O'clock
Figure 404/TASK 72-21-00-991-303
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Installation of the 2 Last Fan Blades at 12 O'clock
Figure 405/TASK 72-21-00-991-304
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R (b) Apply lubricant MoS2 dry film lubricant (Material No. CP5062) or molykote g rapid (Material No. CP2104) to the disk slots, the spacers, the blade roots (dovetails), the blade platforms and lateral surfaces of these platforms, and the midspan shroud mating surfaces, before you install the blades.
NOTE : You must apply a large quantity of lubricant to all the
____ dovetail and slot pressure faces. Brush application is prefered. If you use spray application , a minimum of 4 to 6 passes is necessary to supply all the pressure faces with sufficient lubrication. Let the lubricant become dry to a dull opaque finish before you install the blades in the disk slots.
(2) Installation of the Fan Rotor Blades.
(a) Position the fan blade No. 1 correctly (leading edge forward) and engage (dovetail lug first) in the fan disk slot No. 1 immediately below the offset hole in the fan disk bolt flange.
(b) Push the blade in full position.
(c) Pull down the fan blade to engage the lug into the booster spool recess.
(d) Install the spacer (70) between the fan blade No. 1 and the disk. Push the spacer fully in position against the front frange of the booster spool.
(e) Continue COUNTERCLOCKWISE, and use the same procedure as for fan blade No. 1 to install blades No. 2 through No. 34 in their related slots.
NOTE : The midspan shroud section of each blade will engage and
____ mate with the related midspan shroud sections of adjacent blades.
(f) Install the 2 last fan blades circled 1 and 2 at the 12 O'clock position, as follows:
1 Fully engage blade circled 1, or the 36th blade, in its
_ dovetail recess. Let its dovetail root touch the bottom of the recess. Do not install its spacer.
2 Carefully engage blade circled 2, or the 35th blade, in its
_ dovetail recess and install its spacer (70).
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3 Install the spacer (70) of blade circled 1.
_
(g) Make sure that all the blades and spacers are correctly installed.
(h) Install the spinner rear cone. (Ref. TASK 72-21-00-400-006)
(i) Install the spinner front cone. (Ref. TASK 72-21-00-400-005)
(j) Remove the rubber pad or foam material flooring from the inlet cowl.
5. Close-up
________ Subtask 72-21-00-869-064
A. Make sure that the work area is clean and clear of tool(s) and other items.
Subtask 72-21-00-942-063
B. Close Access
(1) Remove the warning notice(s).
(2) Remove the access platform(s).
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TASK 72-21-00-300-028 Replacement of Fan Rotor Blades in Pairs
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