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Monitor engine vibration indicators for inlet and turbine positions during engine speed
changes to ensure AVM system is operating.
A.  Adjust IDLE trim screw to obtain idle speed determined in paragraph 3.I.(1). Idle setting tolerance is +0.0/-1.0% N2 rpm.
NOTE:  To provide good engine acceleration and satisfactory electrical load carrying capability, engine idle should be adjusted to the upper limit of the % N2 setting tolerance. Engine idle trim adjustment must be accomplished with a calibrated precision tachometer indicator.
Turn IDLE and MIL trim screws clockwise to decrease rpm and counterclockwise to increase rpm. Make all final adjustments in the increase rpm direction. Do not exceed maximum torque value of seven pound-inches when adjusting trim screws.
CAUTION:  EXCEEDING THE MAXIMUM TORQUE LIMIT ON TRIM SCREWS MAY DAMAGE THE FUEL CONTROL UNIT.
B.  Advance thrust lever until contact is made with part power trim stop. Check for satisfactory surge bleed valve closure as the thrust lever is advanced from idle (Fig. 205). Surge bleed valve closure is indicated by a sudden jump in N1 (approximately 8%) and EPR (0.06).
CAUTION:  DO NOT USE EXCESSIVE FORCE WHEN ADVANCING THRUST LEVER AGAINST PART POWER TRIM STOP AS DAMAGE TO THE TRIM STOP MAY OCCUR.
C.  Immediately adjust MIL trim screw to trim target Pt7.
D.  Retard thrust lever to idle and readjust idle setting, if required.
E.  Advance thrust lever until contact is made with part power trim stop and remain for 1 minute.
F.  During the last 30 seconds, adjust the MIL trim screw to trim target Pt7 (+0.5/-0.0 IN. HG ABS) and take complete set of engine instrument readings (except vibration readings).
501 
Feb 20/85  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  71-09-200 Page 209 

G42895G42902
Engine Trim Instrumentation Connections  500 
71-09-200  Figure 204 (Sheet 1)  Aug 15/67 
Page 210 
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500 Engine Trim Instrumentation Connections Feb 15/79 Figure 204 (Sheet 2) 71-09-200 Page 210A/210B BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

T54673
500  Engine Trim Instrumentation Connections 
Feb 15/77  Figure 204 (Sheet 3)  71-09-200 
Page 211 
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G.  Deleted
H.  Retard the thrust lever to idle, if idle RPM is not satisfactory after a 5 minute stabilization period, adjust the idle trim screw and repeat the trim procedure.
NOTE:  Turning engine thermal anti-icing on and then off will speed achieving a stabilized idle. This technique can be used to appreciably shorten engine trim runs.
NOTE:  Idle adjustment of as much as 0.5% N2 (8 "clicks") is permitted after final setting of part power trim without a recheck of part power trim provided final adjustment is made in the increase rpm direction.
I.  Deactivate and lockwire part power trim stop (Fig. 203).
J.  Deleted
500 
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G42803
500  Compressor Anti-Surge Bleed Valves Schedule 
Feb 20/94  Figure 205  71-09-200 
Page 213 
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K.  Compare the following instrument readings recorded during the trim operation.
(1)  
Deleted

(2)  
Compare part power trim EPR recorded at the engine instrument panel with target EPR determined in paragraph 3.I. The difference should not be greater than + 0.02 units. If difference is greater, check EPR system for leaks and faulty indicator or transmitter.

NOTE:  Any Pt7 leakage is a very serious matter since inadvertent engine overboosting can result and false throttle stagger can be created. If a large enough leak is present, engine operating limitations can be exceeded before attaining takeoff EPR. If Pt7 leakage is suspected, conduct leak check of Pt7 system. Refer to Engine Pressure Ratio Indicating System, Chapter 77.

(3)  
The N2 tachometer indicator, on the engine instrument panel, should read within + 0.5 percent rpm of the precision tachometer indicator. If not within this tolerance, the N2 tachometer indicator should be changed and a check run with the new indicator.

L.  Deleted.
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