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!