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Completion of the Test
A. After all of the engine tests are complete, do an engine preservation procedure.
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Training Material
CFM56-7B Engine Testing
Functional Test - 72-00-00-13-002
• Leak Check
• Motoring Check
• Start Test
• FADEC System Test
• Functional Check Break-in, Vibration Signature, and Transient Checks
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Training Material
CFM56-7B Engine Testing
1. Leak Inspection.
A. If necessary, open the cowling doors.
B. Start the fuel supply to the engine. Set the fuel supply to 10-50 psig.
C. Examine all fuel components and tubes for leaks. If leaks are found, stop the fuel supply and correct them.
Do the leak inspection again after you correct the leaks.
D. If the leak inspection is complete, close the cowling doors.
2. Motoring Check. (Do this check before you start the engine).
A. If necessary, open the cowling doors.
B. Motor the engine.
C. Let the engine be stable at the maximum motoring rpm and monitor these items:
(1) Make sure there is a positive indication of oil pressure.
(2) Make sure the N2 indication is approximately 4000 rpm.
(3) Make sure there is an N1 indication.
(4) Make sure the VSV are closed (38.7 ±1 degree).
(5) Make sure the VBV are open (more than 36 degrees).
(6) Make sure there is no leakage from the oil system tubes or components.
D. If necessary, start the fuel supply to the engine.
E. Make sure there is an indication of fuel flow as follows:
(1) Set the Master Lever to ON for a maximum of 15 seconds.
(2) Monitor the fuel flow indicator for a positive indication. If the fuel flow indication is more than 680 pph (308 kg/h),
immediately set the Master Lever to OFF.
(3) Set the Master Lever to OFF. When you do this, the fuel flow indication must decrease to 0.
F. Continue to dry-motor the engine for 60 seconds to remove the fuel from the combustor.
G. Set the Mode Selector to NORMAL.
H. Listen for unusual noises from the engine during the coast- down period.
Functional Test - 72-00-00-13-002
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Training Material
CFM56-7B Engine Testing
3. Start Tests.
A. Do a normal start.
B. Let the engine become stable at minimum idle and make an inspection for leaks or other unusual conditions.
C. If you find problems, do an engine shutdown procedure and correct them before you continue with the test.
D. Make a check of the minimum-to-approach idle transition as follows:
(1) Set the throttle to APPROACH IDLE and make sure the transition is smooth.
(2) Set the throttle to MINIMUM IDLE and make sure the transition is smooth.
　
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