THE WORN OR DAMAGED AREAS MAY BE REPAIRED TO A DEPTH OF 0.0020 INCHES ALONG ALL THE SHANK LENGTH. GRIND, MACHINE OR POLISH TO GET THE NECESSARY SURFACE. NO WORK IS PERMITTED ON THE THREADS OR THE THREAD RUNOUT OR IN THE HEAD TO THE SHANK FILLET. THE AXIAL LENGTH OF THE REPAIR CANNOT BE MORE THAN 10% OF THE GRIP LENGTH.
Engine Mount Wear Limits Figure 601 (Sheet 5)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
71-21-00
ALL ú ú N01 Page 606 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
NO. INDEX PART NAME DIM. DESIGN LIMITS WEAR LIMITS WORN PART REPLACE PART WORN REPAIR INSTR. REPAIR
DIAMETER PER-DIM. WEAR MITTED MAX ANCE CLEAR-DIAM
MIN MAX
24 LINK ID 2.4995 2.5000 -- 0.0020 --
BEARING RACE OD 2.4990 2.5000 -- X
25 BEARING RACE ID -- -- 8 X X
BEARING BALL OD -- -- X
26 LINK ID 1.9995 2.0000 -- 0.0020 --
BEARING RACE OD 1.9995 2.0000 -- X
27 BEARING RACE ID 1.7820 1.7825 1.7852 0.0047 1 X
BEARING BALL OD 1.7805 1.7810 -- X
28 BEARING BALL ID 1.2495 1.2500 1.2522 0.0042 1 X
PIN OD 1.2480 1.2490 1.2458 X 5
29 PIN ID 0.3800 0.4000 0.4012 0.0272 X
BOLT OD 0.3740 0.3745 0.3708 X
30 HANGER ID 1.5669 1.5679
BUSHING OD 1.5683 1.5693
31 BUSHING ID 1.4083 1.4091
BUSHING OD 1.4097 1.4105
32 BUSHING ID 1.2495 1.2505
PIN OD 1.2480 1.2490
33 BEARING BALL ID 1.2495 1.2500 1.2522 0.0042 1 X
BOLT OD 1.2480 1.2490 1.2458 X
0.0050 (RADIAL) + 0.0250 (AXIAL)
Engine Mount Wear Limits
Figure 601 (Sheet 6)
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71-21-00
ALL ú ú N01 Page 607 ú Jun 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(e) Pickup
NOTE: Pickup occurs when material is moved from one surface
____
to a surface which it touches.
(f) High metal
NOTE: High metal is metal which is pushed above the surface
____ adjacent to scratches or other damage.
S 226-004-N00
(3) Examine the lower engine mount and shear pin for worn areas (Fig. 601):
NOTE: Fig. 601 gives the wear limits for the attach points of
____
the lower engine mounts.
(a)
Do the applicable task to get access to the inspection area: "Forward Lower Engine Mount Removal" (AMM 71-21-01/401) or "Aft Lower Engine Mount Removal" (AMM 71-21-02/401).
(b)
Make sure that the barrel nuts in the front of the lower engine mount are free from damage.
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