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B.  The target values needed for engine trimming are identified and defined as follows:
TARGET VALUE  DEFINITION 
IDLE % N2  Percent N2 rpm target to which IDLE trim screw is adjusted. 
TO EPR  EPR target to which engine is operated, after part power trim operation, to check availability of TAKEOFF power and amount of throttle cushion. 
PP EPR  EPR reference for personnel in control cabin. This value gives an indication of the accuracy of the airplanes EPR indicating system. This value must not be used for engine trim unless precision trim instrumentation is not available and airplane instruments are known to be accurate. If control cabin instruments are used for engine trim, a complete trim run must be accomplished as soon as calibrated trim instruments become available. 
PP PT7  Pt7 target to which MIL trim screw is adjusted during part power trim operation. 

C. The trim table locator tabulation is shown on Fig. 202. 
500 
Feb 20/88  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  71-09-210 Page 201 

2.  Power Plant Trim Data Usage
NOTE:  For the example problem (Fig. 201) the ambient temperature, barometric pressure, and engine data plate rpm are assumed and the applicable portion of a typical trim table page is shown. The proper trim table page for specific situations may be located using Fig. 202.
A.  Determine trim table section and page on which data for ambient temperature and barometric pressure are located (Fig. 202).
B.  Using appropriate page, determine following target values corresponding to ambient
temperature and/or barometric pressure.

(1)  
Deleted.

(2)  
IDLE % N2 (1)

(3)  
TO EPR (2)

(4)  
PP EPR (3)

(5)  
PP PT7 (4)

CAUTION:  PAY PARTICULAR ATTENTION TO ANY FOOTNOTES CONCERNING USE OF PART POWER TRIM STOP.
NOTE:  If ambient temperature or barometric pressure is found to fall between values given in trim table, correct data can be obtained by interpolation.
Data plate information is included in the Trim Tables as reference material only.
500 
71-09-210 Page 202  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 20/88 

H30542
500  Typical Trim Data Usage 
Feb 20/88  Figure 201  71-09-210 
Page 203 

EFFECTIVITY
JT8D - 17 ENGINES
BAROMETRIC PRESSURE INCHES OF MERCURY ABSOLUTE
AMBIENT TEMPERATURE - FO
20.9 TO 22.4  22.5 TO 24.0  24.1 TO 25.6  25-7 TO 27.2  27.3 TO 28.8  28.9 TO 30.4  30.5 TO 32.0 
-38 TO -22  SECTION 71-01-241 PAGE 202  SECTION 71-09-242 PAGE 202  SECTION 71-09-243 PAGE 202  SECTION 71-09-244 PAGE 202  SECTION 71-09-245 PAGE 202  SECTION 71-09-246 PAGE 202  SECTION 71-09-247 PAGE 202 
-20 TO -4  203  203  203  203  203  203  203 
-2 TO +14  204  204  204  204  204  204  204 
16 TO 32  205  205  205  205  205  205  205 
34 TO 50  206  206  206  206  206  206  206 
52 TO 68  207  207  207  207  207  207  207 
70 TO 86  208  208  208  208  208  208  208 
88 TO 104  209  209  209  209  209  209  209 
106 TO 120  210  210  210  210  210  210  210 

Trim Table Locator Tabulation  554 
71-09-210  Figure 202 (Sheet 1)  Jun 20/83 
Page 204 

BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
EFFECTIVITY

JT8D-17A ENGINES

BAROMETRIC PRESSURE INCHES OF MERCURY ABSOLUTE
AMBIENT TEMPERATURE - F°
20.9 TO 22.4  22.5 TO 24.0  24.1 TO 25.6  25.7 TO 27.2  27.3 TO 28.8  28.9 TO 30.4  30.5 TO 32.0 
-38 TO -26  SECTION 71-09-261 PAGE 202  SECTION 71-09-262 PAGE 202  SECTION 71-09-263 PAGE 202  SECTION 71-09-264 PAGE 202  SECTION 71-09-265 PAGE 202  SECTION 71-09-266 PAGE 202  SECTION 71-09-267 PAGE 202 
-20 TO -4  203  203  203  203  203  203  203 
-2 TO +14  204  204  204  204  204  204  204 
16 TO 32  205  205  205  205  205  205  205 
34 TO 50  206  206  206  206  206  206  206 
　
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