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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
~.............................................................................. | | | CORRECTIVE | | CHECK | LIMIT | ACTION | ................................................................................ | Axial scratches area B |None permitted |Replace the | | | |manifold | ................................................................................
| Nicks and pits area C |0.031 inch (0.8 mm) maximum depth |Make the |
| |after you make it smooth |depressions |
| | |smooth |
................................................................................ | Nicks and pits areas |None permitted |Replace the | | A and B | |manifold | ................................................................................ |Thread damage |One-half thread cumulative or |Remove the | | |continuous after removal of the |damage thread or| | |damage threads |replace the | | | |manifold | 2..........................…..................................…................1
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE A FUEL NOZZLE (20 LOCATIONS)
SEE B
FUEL SUPPLY MANIFOLD TUBES
DRAIN MANIFOLD
A1
FUEL NOZZLE (20 LOCATIONS)
FUEL SUPPLY MANIFOLD TUBES
A2 1
ENGINES WITHOUT CFMI SB 73-116
2ENGINES WITH CFMI SB 73-116
Fuel Manifold Lines Inspection Areas Figure 601 (Sheet 1)
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
DRAIN MANIFOLD/
LINE CONNECTOR
NOZZLES AT POSITION
3,6,8,11 AND 18
AREA C
AREA B POINT
AREA A
AREA A AREA B AREA C (EXAMPLE)
(EXAMPLE)
G-M56-SM-0723(1)-00-C
Fuel Manifold Lines Inspection Areas Figure 601 (Sheet 2)
F90262
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
FUEL CONTROL SYSTEM - DESCRIPTION AND OPERATION
_______________________________________________
1. General_______
A. Fuel Control System is comprised of:
(1)
Main Engine Control, AMM 73-21-01
(2)
Compressor Inlet Temperature Sensor, AMM 73-21-02
(3)
Engine Idle Control System including Idle Reset Solenoid,
AMM 73-21-00
(4)
Power Management Control, AMM 73-21-04
(5)
T12 Temperature Sensor, AMM 73-21-05
(6)
CFMI Wiring Harness, AMM 73-21-06
(7)
Fuel Control Box, AMM 76-11-08
(8)
N2 Control Alternator Speed Sensor, AMM 73-21-08
(9)
T2 Temperature Sensor, AMM 73-21-09.
B. The fuel control system, in conjunction with the variable stator vane and variable bleed valve systems, regulates the thrust output of the engine under all conditions. The main engine control (MEC) integrates inputs from the thrust lever, compressor inlet temperature (CIT) sensor, compressor discharge pressure (CDP), variable stator vane feedback position, high pressure compressor speed (N2), variable bleed valve feedback position and Power Management Control (PMC) to establish the desired power output level. The system controls transient and steady-state fuel flows and sets variable stator vane and variable bleed valve positions to maintain steady-state speeds and acceleration/deceleration transients within stall and temperature limits. The engine idle control system indicates a low idle condition on approach and during icing conditions and provides high idle as required.
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