(b)
Either engine idle reset solenoid is energized and respective TLA is set to 9 1/2 degrees or less.
(c)
Engine speed is less than 45% N1 while above 46% N2 for either engine and these conditions occur: 1) The start switch is in the FLT position for either engine 2) The airplane is above 500 feet radio altitude.
(4)
The idle reset solenoid circuit is separate from the LOW IDLE light circuit and provides high and low engine idle. The solenoids, when energized, restrict idle fuel flow, with corresponding engine speed decrease. This is accomplished when the airplane is on the ground. The solenoids provide additional idle fuel flow during high idle in flight.
E. AIRCRAFT WITHOUT THE INDICATION CIRCUIT FOR THE 45% N1 ENGINE IDLE; Engine Idle Control System (Fig. 11)
(1)
Power for the engine idle control circuit is provided by the IDLE CONT and MASTER CAUTION circuit breakers located on the P6-2 circuit breaker panel (WDM 73-23-11). The indication system monitors engine fan speed (N1), thrust lever angle (TLA), start lever position and the state of the idle reset solenoids.
(2)
The LOW IDLE light is illuminated in the following cases:
(a)
Start lever is set to IDLE and respective engine speed (N1) is less than 25%
(b)
Either engine idle reset solenoid is energized and respective TLA is set to 9 1/2 degrees or less.
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73-21-00
ALL ú ú C02 Page 31 ú Nov 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
DISCONNECTED
Engine Idle Control Schematic Figure 11 (Sheet 1)
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73-21-00
FOR THE 45% N1 ENGINE IDLE ú ú C01 Page 32 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
AIRCRAFT WITH THE INDICATION CIRCUIT FOR ú
73-21-00
THE 45% N1 ENGINE IDLE ú
ú C02 Page 33
ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(3) The idle reset solenoid circuit is separate from the LOW IDLE light circuit and provides high and low engine idle. The solenoids, when energized, restrict idle fuel flow, with corresponding engine speed decrease. This is accomplished when the airplane is on the ground. The solenoids provide additional idle fuel flow during high idle in flight.
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73-21-00
ALL ú ú C03 Page 34 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FUEL CONTROL SYSTEM - ADJUSTMENT/TEST
_____________________________________
1. General_______
A. This procedure contains two tasks:
(1)
The first task is the test of the fuel control system.
(2)
The second task is the system test of the engine idle control.
TASK 73-21-00-705-041-C00
2. Fuel Control System - Adjustment/Test_____________________________________
A. General
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