CFM56-7 7.B.N. Software Version

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CFM56-7
7.B.N.
Software
Version
CFM56 Operators Conference – May 21 - 22, 2002 CFM Proprietary Data Unauthorized Disclosure Prohibited 2
CFM56-7 7BN Software
• Key Functional Changes
- High altitude ratings for 737-600 and 737-700
- Modified PS3 lower range limit
- EGT trim logic simplification
- Improved VSV & VBV selection logic
- Improved start-lever selection logic
- Modification To VBV fault disagree threshold
- Revised N1 Trim washout function
- Correction to EGT redline indication during airstarting
- BSV and MSV solenoid driver logic
CFM56 Operators Conference – May 21 - 22, 2002 CFM Proprietary Data Unauthorized Disclosure Prohibited 3
7.B.N Change List
• High Altitude Rating(s) for 737-600 and 737-700
- Addition of two new ratings - 7B22/B2 (for -600) 7B26/B2 (for -700)
- Takeoff and Climb same as current 7B22 (for -600) and 7B24 (for -700)
- Emergency Over Boost (EOB) faired between 7B22 and 7B27B1 (for -600) and
7B26 and 7B27B1 (for -700)
- Max Continuous faired between 7B22 and 7B26 (for -600) and 7B24 and 7B26 (for -
700)
- Input Selection (New ID Plug Rating)
- Maintenance Logic (FDP and MMP)
• Ps3 Signal Selection
- Modification to range checking to improve detection of disconnected Ps3 line
• EGT Trim Logic
- Simplification to trim logic to aid in EGT trending
- Currently two EGT trim levels exist (takeoff and EOB)
- Proposed logic ties EGT trim to nameplate allowing for one EGT trim level
- Elimination of DAC Shunt for 7B27B1 Rating
CFM56 Operators Conference – May 21 - 22, 2002 CFM Proprietary Data Unauthorized Disclosure Prohibited 4
• VSV/VBV Selection logic
- Improvement to current selection logic robustness by using a fault history
similar to FMV selection
• Start Lever Selection Logic
- Current logic prevents engine starts with single point failure in start lever
- DEU 1 and DEU 2 discrete signals are not fully independent (share same start
lever relay)
- New logic to use the two analog EEC reset discretes and two igniter
voltages in a 2 out of 4 or 3 out of 4 voting scheme
• VBV Disagree Fault Tolerance
- Disagree fault threshold to be changed from a constant 4 degrees to a
variable as a function of VBV door position
- Maintain current 4 degrees threshold at high power
- Increase threshold at low power to prevent inadvertent VBV disgree faults from
being set
7.B.N Change List (cont.)
CFM56 Operators Conference – May 21 - 22, 2002 CFM Proprietary Data Unauthorized Disclosure Prohibited 5
7.B.N Change List (cont.)
• N1 trim washout function
- Modify washout function so that trim is ramped out between 103.5% and
103.7% to eliminate ‘flat’ in indicated N1
• New throttle interpolation curves for new high altitude ratings
- New interpolation points used with new ratings in order to maintain thrust
sensitivity requirements
• Modification to quick windmill relight EGT redline inhibit logic
- Latches quick windmill relight timer threshold
- Prevents EGT redline inhibit once start determined not to be a quick windmill relight
- Addresses potential for erroneous redline indication during over temperature
events
• Modification to burner staging valve and main staging valve driver logic
- When opening the MSV Channel-A and Channel-B will drive the solenoid for
two seconds (DAC only)
- When closing the BSV channel-a and channel-b will drive the solenoid for two
seconds (SAC only)
- After two seconds the channel-in-control will keep the solenoid energized
until required to de-energize

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CFM56-7 7.B.N. Software Version

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CFM56-7 7.B.N. Software Version