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-------------------------------------------------------------------------------next. Removal of 2 or 3 fan blades gives a better accessibility to do the check.
Be careful to not use a tool or excessive force during the check. This would damage the vanes.
Do the check on an area including 3 or 4 vanes on each side of the vane where the cracked inner shroud is located. Place the tool on the leading edge mid-span of the counterclockwise most vane. Lightly stroke the vane and subsequent vanes in the clockwise direction using a constant speed. Note any variations in the sound tone from one vane to the next. If there is a difference between the vane where the recess is cracked and the other vanes, the stage 1 vane assembly is unserviceable.
(8) Vane leading and trailing edges 10 cycles/50 hours
- Nicks, dents and scratches on LE/TE in
areas B and C with a maximum axial length
less than 0.117 in. (2.97 mm)
- Nicks, dents and scratches on LE/TE in area 2 cycles/10 hours A with a maximum axial length of 0.117 in.
(2.97 mm)
2. Fan frame
A. Fan frame
(1) Cracks, any number if max length of 0.16 in. 10 cycles or 25
(4.06 mm) and min. separation of 1 in. (25.4 hours mm)
(2) Nicks and dents, any number 10 cycles or 25 hours
B. Fan inlet case
(1) Cracks: any number, if max length of 0.16 in. 10 cycles or 25
(4.06 mm) and min. separation of 1 in. (25.4 hours mm)
(2) Nicks and scratches: any number 10 cycles or 25 hours
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(3) Crater in abradable liner (length<5x width) 50 cycles or 125 and damage other than crack rub and hours circumferential defect : if the damage is within the maximum serviceable limit (Ref. TASK 72-23-00-210-003), but the fan case parent metal is exposed and is confirmed via visual inspection to be undamaged.
(4) Grooves in abradable liner (oriented within 0 50 cycles or 125 deg. to 80 deg. from engine axis and hours. length>5x width : if the damage is within the maximum serviceable limit, (Ref. TASK 72-23-00-210-003), but the fan case parent metal is exposed and is confirmed via visual inspection to be undamaged
(5) Circumferential defect in abradable liner 50cycle or 125 (360 deg. or oriented within 80 deg. to 90 hours. deg. from engine axis) : For one or a cumulated defect less than 2 in. (50.8 mm) if the fan case parent metal remains not damaged under visual inspection.
C. Outlet Guide Vanes (OGV) for: R (Ref. Fig. 608/TASK 72-00-00-991-321)
(1) Broken vane: not serviceable, if vane is 10 cycles extension replaced
(2) Missing vane: One doublet missing 10 cycles extension
(3) Cracks
Outer platform: cracks from or along the 50 cycles extension airfoil are defined
R (Ref. Fig. 608/TASK 72-00-00-991-321)
(4) Metal leading edge missing: up to 0.78 in. 100 cycles (20 mm) in height and 0.39 in. (10 mm) extension
(5) Nicks and/or dents, on leading edge (metallic A maximum service leading edge), if damage between 0.12 in. (3 extension of 100 mm) and 0.19 in. (5 mm) deep cycles
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(6) Erosion of composite material, any amount 50 cycles or 125
hours
D. OGV inner shroud
(1) Cracks, cut or torn seal at mating with OGV, 25 cycles or 50
any amount hours
E. Fan duct panels
(1) Missing panel: Not permitted
(2) Missing lowers on panel 50 cycles with 3
missing lowers
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