(a)
LOW IDLE (%N2)
(b)
HIGH IDLE (%N2)
(2)
Main Engine Control (MEC) Trim (Test No. 6)
(a)
PART POWER (P-P) PMC OFF (%N2)
(b)
PART POWER (P-P) PMC ON (%N1)
(3)
Accel/Decel Check (Test No. 8)
(a)
STATIC TAKEOFF (T.O.) PMC ON/OFF (%N1)
(b)
ACCEL CHECK START (%N1)
(c)
ACCEL CHECK TARGET (%N1)
D.
The trim tables contain data for a range of ambient outside air
temperatures (OAT) and barometric pressures.
(1)
The data range for the OAT is -40°F (-40°C) thru 120°F (49°C) in increments of 2°F.
(2)
The data range for the barometric pressure range is 21.5 thru 31.0 inches of mercury in increments of 0.5 inches of mercury.
E.
The trim data is applicable to an engine with these conditions:
(1)
No bleed air load
(2)
No electrical load.
F.
The tolerances for each speed target (if applicable) are at the bottom of each page.
TASK 71-00-01-972-001-C05
2. Find the Engine Speed Target
____________________________
A. Equipment
(1) Alcohol Thermometer - MIL-T-11399, Type ML-5 (or mercury thermometer if not taken on the airplane), -40 to 120°F (-40 to 49°C), | 1/2°F (| 1/4°C) accuracy.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. CFM56-3B-2 ENGINES ú
71-00-01
(RATED AT 22K) ú CONFIG 5 ú C02 Page 201 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
EXAMPLE PROBLEMASSUME: AMBIENT TEMPERATURE (0AT) = 60`F (16`C) BAROMETRIC PRESSURE = 30.0 INCHES OF MERCURY
DETERMINE TARGET VALUES:
LOW IDLE = 60.8 +3.0/-1.0 %N2
HIGH IDLE = 69.9 +3.0/-0.7 %N2 P-P PMC OFF = 91.4 +0.5/-0.5 %N2
P-P PMC ON = 73.4 +1.5/-1.5 %N1
STATIC T.O. PMC ON/OFF = 94.6 %N1
ACCEL CHECK TARGET = 92.8 %N1 6
Trim Table Usage Figure 201
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. CFM56-3B-2 ENGINES ú
71-00-01
(RATED AT 22K) ú CONFIG 5 ú C01 Page 202 ú Nov 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
B. Calculate the Target Value (Fig. 201).
S 972-005-C05
CAUTION: THE TRIM TABLES IN THIS SECTION ARE APPLICABLE TO
_______
CFM56-3B-2 ENGINES AND ARE AUTHORIZED FOR USE ON
CFM56-3-B1 ENGINES FOR THE ENGINE TRIM BALANCE REQUIREMENTS.
(1) Make sure you have the correct trim tables for the engine model.
S 972-002-C05
CAUTION: DO NOT USE THE AIRPLANE TOTAL TEMPERATURE INDICATION TO GET THE
_______ AMBIENT AIR TEMPERATURE. AN INCORRECT TEMPERATURE CAN GIVE YOU AN INCORRECT TARGET SELECTION.
DO NOT USE A MERCURY THERMOMETER IN THE AIRPLANE. IF THE THERMOMETER BREAKS, THE MERCURY CAN TOUCH AIRPLANE COMPONENTS AND CAUSE DAMAGE.
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