N1 = 3400 RPM
2) From the Trim Balance Matrix (Figure 503). Spinner Hole Location - number 19
Balance Weight Quantity (W1) - 60.0 grams
3) From the Polar Weight Map (Figure 505). Locations 18, 19, 20, and 21 have P07
screws installed.
4) Make a selection of the necessary screw or screws.
Removed Installed Effective Difference
Hole 18 P07 P05 14.71
Hole 19 P07 P06 17.31
Hole 20 P07 P05 14.71
Hole 21 P07 P05 14.71
--------
W1 = 61.44
I. Install the balance screws as follows:
(Figure 506)
SUBTASK 72-31-00-945-020-G00
(1) Put protective mats, STD-6378 (3 required) on the bottom half of the internal inlet cowl.
SUBTASK 72-31-00-025-039-G00
(2) Remove the screws to be replaced by the W1 screws.
(a) Make a record of the location of each of the screws that you remove.
(b) Keep the screws because it is possible you will have to put them back (in the same
location).
SUBTASK 72-31-00-435-017-G00
(3) Install the replacement balance screws.
(a) Tighten the screws to 50-75 pound-inches (5.6-8.4 newton meters).
SUBTASK 72-31-00-945-026-G00
(4) Remove the protective mats from the internal inlet cowl.
J. Do a check of the correction for the imbalance of the engine (Run number 2).
SUBTASK 72-31-00-865-018-G00
(1) Do the steps in the Operate the Engine paragraph.
NOTE: Operate the engine at the same N1 speed (rpm) that was used for the initial engine
run.
(a) Look at the engine vibration indication on the lower EICAS display (Figure 507).
1) The guideline is 2.5 units (on the display). No sudden changes of 1.0 units or more
are permitted (PAGEBLOCK 71-00-00/201).
2) If the vibration amplitude is less than the guideline, the trim balance procedure is
complete.
a) Do the steps to put the Airplane Back to its Usual Condition.
3) If the vibration is more than the guideline, continue with the procedure.
767
AIRCRAFT MAINTENANCE MANUAL
CF6-80A SERIES ENGINES
72-31-00
NoC
Page 505
D633T1B7 Aug 22/2017
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ABX 001-007, 011, 012, 016-019, 021, 022, 025, 101,
109, 114, 115, 314-999
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