posted 22nd April 2004 03:11
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cfm56-7 hmu changes
Hi WJman,
I have changed HMU`s on CFM56-7 fitted to B737NG and found they are so much easier than on the classic.Nil rigging involved,testing involves an
1)actuators test through the EEC
2)dry motor
3)idle power leak check
4)engine ground run EEC bite test.
The HMU is removed with the fuel pump package(quite heavy) due to access to some parts is restricted unless you have some "special wrenches".
The classic (CFM56-3) was quite involved and easily takes double the time due to the extensive rigging/testing involved,
VSV feedback cable rigging
VBV feedback cable rigging
Thrust lever cable rigging
Start lever cable rigging
PMC Adjustment
Specific Gravity Check
Low idle power adjustment
High idle power adjustment
Mec trim ( engine run)
Accel/deccel check(egr)
Power assurance (engine run)
Give my the NG any DAY!
Thanks for the info, I juts started working on the NG's -700. The course was good but I am a hands on type of guy. I learn more through chasing snags and changing parts. The only problem is that the NG-700's never seem to break, and when they have it has been easy to diagnose and fix. Don't get me wrong it's great to have a good a/c, it's goo fro the company, OTP and all that stuff, but sometimes a good snag on an overnighter makes the shift go by quicker and helps me learn the a/c quicker. Thanks again.