elevation to get the LBP.
(b)
The equation to find LBP using the altimeter setting in inches of Hg and Standard Local Barometric Pressure (SLBP) is: LBP = (Altimeter Setting in inches of Hg - 29.92) + SLBP
NOTE: To do a check of the LBP (if an altimeter is available), adjust the altimeter to zero feet altitude and read LBP from the barometric pressure display window of the altimeter.
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I. Using trim table sections, determine and record the following targets for the existing ambient temperature and true local barometric pressure:
(1)
Idle target - % N2 rpm
(2)
Part power trim target - Pt7 and EPR
(3)
Takeoff power target - EPR
NOTE: If trim table has a staggered line, targets appearing to the right of the line will require use of the part power trim stop in the cold weather (C) position during trim procedure. Targets appearing to the left, or on a table without a staggered line, will require use of the part power trim stop in the standard (S) position.
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Altimeter Setting Conversion to Local Barometric Pressure 501
71-09-200 Figure 202A Feb 01/95
Page 206B
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
J. Deleted
K. Activate part power trim stop at engine fuel control (Fig. 203) according to following:
(1)
If trim table for targets determined in step I does not have a staggered line, ensure that trim stop spacer is installed in standard position with the S visible (facing outward).
(2)
If trim table for targets determined in step I has staggered line, ensure that trim stop spacer is installed in C or S position according to table footnotes.
CAUTION: THE IMPORTANCE OF USING THE CORRECT PART POWER TRIM STOP DURING ENGINE TRIM RUNS CANNOT BE OVEREMPHASIZED. INABILITY TO REACH TAKEOFF EPR OR EXCESSIVE THROTTLE STAGGER WITH SENSITIVITY AND EXCESSIVE OVERBOOST CAPABILITY WILL RESULT FROM THE USE OF THE INCORRECT PART POWER TRIM STOP. THE TRIM STOP SPACER SHOULD NEVER BE REMOVED FROM THE FUEL CONTROL UNLESS A COLD WEATHER TRIM IS NECESSARY. ALWAYS STOW TRIM STOP IN THE STANDARD POSITION WITH THE S VISIBLE.
L. Start auxiliary power unit or connect external electrical power and ground low pressure air supply to airplane.
M. Start engine (Ref 71-09-100).
CAUTION: OBSERVE NORMAL ENGINE OPERATING LIMITATIONS WHEN TRIMMING ENGINES. ON THE INITIAL TRIM RUN OF A NEWLY INSTALLED ENGINE, PROMPT THRUST LEVER MOVEMENT MAY BE REQUIRED TO PREVENT OVERSPEEDING OR OVERBOOSTING THE ENGINE IF THE "MIL" TRIM SCREW IS MALADJUSTED OR IF THERE IS A LEAK IN THE Pt7 SYSTEM.
N. Allow 5 minutes for engine to stabilize at idle setting. Observe that engine instrument indications are within normal operating ranges.
O. Shut down APU (if operating) or turn off external pneumatic supply.
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4. Trim Engine
NOTE: Fuel heater, generator, air conditioning packs, anti-icing, and low pressure air bleeds must be turned off during engine trimming. The engine part power trim curves are based on NO LOAD - NO AIR BLEED, and Ground Static Conditions. Generator cooling air bleed is negligible as are the no load power requirements of the system A hydraulic pump and the constant speed drive. For proper engine trim, engine oil temperature must be within the green band for all ambient conditions.
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