INTENTIONALLY BLANK
F 『R E E Page 81372-21-00
E E May 01/00 E E ECES E F 『 E C F M E E E E 56-5B E F 『 E C F M E E E E 56-5B E F 『 E C F M E E E E 56-5B E F 『 E C F M E E E E 56-5B E
R R Fan Blade Blending Repair limits Figure 804/TASK 72-21-00-991-333- 13 (SHEET 1)
F EEFF : E E ECES ALL 『E 72-21-00EEE Page 814 May 01/00
R R Fan Blade Blending Repair limits Figure 804/TASK 72-21-00-991-333- 23 (SHEET 2)
F EEFF : E E ECES ALL 『E 72-21-00EEE Page 815 May 01/00
R R Fan Blade Blending Repair limits Figure 804/TASK 72-21-00-991-333- 33 (SHEET 3)
F EEFF : E E ECES ALL 『E 72-21-00EEE Page 816 May 01/00
R Typical Examples of Unacceptable Leading Edges Contours R Figure 805/TASK 72-21-00-991-334
F 『 EEFF : ALL E Page 81772-21-00
E E May 01/00 E E ECES E
F 『
E C F M E
E E
E 56-5B E
E E
Subtask 72-21-00-220-054
B. Examine the fan blades.
(1) Leading edge and trailing edge in the critical root area.
(a) Find the critical root area. R 1_The root area longitudinal dimension is 2.32 in. (60 mm).
(2) Mid span shroud area.
(a) Find the critical area for the mid span shroud.
R 1_ The critical areas are at 1.57 in. (40 mm) from the leadingR edge and at 1.18 in. (30 mm) on each side of the mid span R shroud.
R 2_ The critical areas are at 0.63 in. (16 mm) from the bottom ofR the mid span shroud and at 0.39 in. (10 mm) from the mid span R shroud trailing edge.
(3) Leading edge and trailing edge repair in non critical areas.
(a) The leading edge dimensions. 1 Taper the blend repair for area A and area B as follows:
_
R a_ In area A the blend repair is not more than 0.08 in. (2R mm). R b_ In area B the blend repair is not more than 0.339 in. (8.6
R mm). c When the distance (Dim. O) between two blend repairs is
_ less than or equal to five times the depth of the smallest of these blends, tangentially blend out the bottom of the two blends.
d The total length of blend repairs permitted on the leading
_ R edge is equal to 2.76 in. (70 mm) per blade.
(b) The leading edge (area A and B) blend repairs are permitted with these limits.
1 Make sure that after you do the blending repair, the edge
_ thickness is not less than the initial thickness.
F 『 EEFF : ALL E Page 81872-21-00
E E Aug 01/00 E E ECES E
F 『
E C F M E
E E
E 56-5B E
E E
2 The longitudinal direction of the repair for area A must be
_ equal to or more than ten times the depth (Dim. P) of the damage.
3 The longitudinal direction of the repair for area B must be
_ equal to or more than eight times the depth (Dim. P) of the damage.
4 The minimum radius R4 is equal to or more than fifteen times
_ of depth (Dim. P) for area A.
5 The minimum radius R4 is equal to or more than ten times of
_
depth (Dim. P) for area B.
6 The radius R3 for the blend repair on either side of the
_ R initial damage is a minimum radius blend of 0.2 in. (5 mm) and R a maximum radius blend of 0.31 in. (8 mm).
7 If the distance (Dim. O1) between the blend repair and the
_ blade tip is not more than two times the depth (Dim. P) of the repair, do the step:
a Blend the bottom area of the repair tangentially from the
_
depth of the area to the blade tip and blend the tip to the R blending tip radius R1 with a minimum radius blend of 0.02 R in. (0.5 mm) and a maximum radius blend of 0.67 in. (17 mm) R at R1 minimum possible value.
(c) The trailing edge dimensions.
1 Taper the blend repair as follows:
_
R a_The blend repair is not more than 0.059 in. (1.5 mm).
b When the distance (Dim. O) between two blend repairs is
_ less than or equal to five times the depth of the smaller repair area, blend the two repairs together to a depth of a line which tangentially connects the bottom areas.
c The total length of blend repairs permitted on the trailing
_ R edge is equal to 1.77 in. (45 mm) per blade.
(d) Trailing edge blend repairs are permitted with these limits.
1 Make sure that after you do the blending repair, the edge
_ thickness is not less than the initial thickness.
F 『 EEFF : ALL E Page 81972-21-00
E E Aug 01/00 E E ECES E
F 『
E C F M E
E E
E 56-5B E
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(111)
