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E. Do an engine shutdown procedure.
F. Fill the oil tank to full.
G. Do a normal start.
H. Operate the engine at or near minimum idle before you accelerate to a higher power setting.
I. If necessary, do an engine shutdown procedure.
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CFM56-7B Engine Testing
4. FADEC System Test.
A. Perform an engine shutdown procedure.
B. Remove power to both channels of the ECU (off for at least 30 seconds).
C. Energize both channels of the ECU.
NOTE: One channel will become active, the other channel will be in stand-by. Assuming equivalent health on both channels,
the channel in control will alternate on each engine shutdown.
D. Make sure that there are no FADEC faults indicated on the ARINC output. If a fault is generated, perform necessary troubleshooting and clear the fault.
E. Do an engine start procedure.
F. Let the engine become stable at minimum idle.
G. Make sure of the integrity of the FADEC System as follows:
(1) Slowly accelerate the engine to 11,100 rpm N2, and allow it to become stable.
(2) Decelerate the engine to minimum idle. Let the engine become stable for 5 minutes.
(3) If no faults were generated, continue to the next step. If a fault is generated, perform necessary trouble-shooting to clear the fault, and repeat this test.
H. Do an engine shutdown procedure.
I. Make sure that the stand-by channel (from the first time through the test) becomes active. This is to make sure that the FADEC system test is done on both channels of the ECU.
J. Repeat paragraph 5.D. through paragraph 5.H.
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CFM56-7B Engine Testing
5. Functional Check Break-in, Vibration Signature, and Transient Checks.
A. General.
(1) You can do these checks at the same time.
(2) This procedure conditions the surfaces of these seals to help keep clearance deterioration to a minimum in normal service:
. Low Pressure Turbine (LPT) shrouds
. LPT interstage seals
. Compressor discharge seals
. Balance piston seals
(3) Carefully monitor the fan vibration levels during all accelerations and decelerations. Do a fan trim balance procedure if the fan vibrations are not in the limits.
(4) Carefully monitor the core vibration levels during all accelerations and decelerations. Send the engine to the shop if the core vibrations are not in the limits.
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The recommended acceptance test has
been designed to combine all tests into
　
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