(c)
When you install key B into a hole, put key B tightly against the side of the hole (VIEW C).
(d)
Bend a minimum of one key to the necessary clearance (VIEW D).
(e)
Make sure that a minimum width of 75 percent of the key A touches the flat side of the fastener (VIEW A).
NOTE: Measure the width of the key at the bottom of the
____
key.
(f) Bend the remaining keys to an easy shape to make sure that you will not use the tab washer again.
S 422-023-N00
(2) Elliptical keys:
(a)
Bend the washer up across one full face of the fastener (VIEW E).
(b)
Bend the key to the necessary clearance (VIEW D).
S 422-024-N00
(3) Multiple-hole keys:
(a) For multiple-hole keys with elliptical tabs, refer to the elliptical keys.
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MULTIPLE-HOLE ELLIPTICAL TAB WASHER
E
L-71055
Tab Washer Installation Figure 203
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(b) For other multiple-hole keys, refer to standard keys.
S 212-025-N00
(4) Position control:
(a) Do these steps to prevent damage to the keys:
1) Use the marking pencil to make a mark on the tab washer and the adjacent surface, that does not turn.
NOTE: Do not make the mark on the fastener because it
____ can turn with the key washer.
2) Look at the mark to make sure that the tab washer does not turn, when you tighten the fastener.
S 422-026-N00
(5) Permitted standards:
(a) Correctly installed key washers have these properties: 1) You installed a new key washer and bent the tabs with the instructions that we have given.
2) You bent the keys to make sure that the tab washer will not shake and the fastener will not loosen.
TASK 70-21-00-402-014-N00
5. Cup Washer Installation
_______________________
A. General
(1)
This procedure tells you how to crimp the cup washers on the nut.
(a) This holds the nut in its position.
(2)
Only use the cup washers one time.
B. Consumable Materials
(1) G00846 Pencil - Colorbrite Silver No. 2101
C. Access
(1) Location Zone
412 Engine No. 1
422 Engine No. 2
432 Engine No. 3
442 Engine No. 4
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THREAD DIMENSION MINIMUM DENTS
NUMBER SEPERATION
0.000-1.500 INCH 1.500-2.500 INCH 2.500-4.000 INCH OVER 4.000 INCH (0.00 - 38 mm) (38 - 64 mm) (64 - 102 mm) (102 mm) 2 4 6 8 45` |15` APART 67`30' |22`31' 8 SLOT NUT 60` |15` APART 6 SLOT NUT 90` |30` APART 180` |30` APART
FOR NUTS WITH EIGHT SLOTS
DENT LIMITS
E
L-90029
TABLE A
Cup Washer Installation
Figure 204 (Sheet 1)
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SIZE "B" (REF.) DENT LIMITS "C" MINIMUM (0.6B) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 STANDARD PRACTICES - ENGINE(19)
