CFM56-7 7.B.N. Software Version
**** Hidden Message ***** CFM56-7<BR>7.B.N.<BR>Software<BR>Version<BR>CFM56 Operators Conference – May 21 - 22, 2002 CFM Proprietary Data Unauthorized Disclosure Prohibited 2<BR>CFM56-7 7BN Software<BR>• Key Functional Changes<BR>- High altitude ratings for 737-600 and 737-700<BR>- Modified PS3 lower range limit<BR>- EGT trim logic simplification<BR>- Improved VSV & VBV selection logic<BR>- Improved start-lever selection logic<BR>- Modification To VBV fault disagree threshold<BR>- Revised N1 Trim washout function<BR>- Correction to EGT redline indication during airstarting<BR>- BSV and MSV solenoid driver logic<BR>CFM56 Operators Conference – May 21 - 22, 2002 CFM Proprietary Data Unauthorized Disclosure Prohibited 3<BR>7.B.N Change List<BR>• High Altitude Rating(s) for 737-600 and 737-700<BR>- Addition of two new ratings - 7B22/B2 (for -600) 7B26/B2 (for -700)<BR>- Takeoff and Climb same as current 7B22 (for -600) and 7B24 (for -700)<BR>- Emergency Over Boost (EOB) faired between 7B22 and 7B27B1 (for -600) and<BR>7B26 and 7B27B1 (for -700)<BR>- Max Continuous faired between 7B22 and 7B26 (for -600) and 7B24 and 7B26 (for -<BR>700)<BR>- Input Selection (New ID Plug Rating)<BR>- Maintenance Logic (FDP and MMP)<BR>• Ps3 Signal Selection<BR>- Modification to range checking to improve detection of disconnected Ps3 line<BR>• EGT Trim Logic<BR>- Simplification to trim logic to aid in EGT trending<BR>- Currently two EGT trim levels exist (takeoff and EOB)<BR>- Proposed logic ties EGT trim to nameplate allowing for one EGT trim level<BR>- Elimination of DAC Shunt for 7B27B1 Rating<BR>CFM56 Operators Conference – May 21 - 22, 2002 CFM Proprietary Data Unauthorized Disclosure Prohibited 4<BR>• VSV/VBV Selection logic<BR>- Improvement to current selection logic robustness by using a fault history<BR>similar to FMV selection<BR>• Start Lever Selection Logic<BR>- Current logic prevents engine starts with single point failure in start lever<BR>- DEU 1 and DEU 2 discrete signals are not fully independent (share same start<BR>lever relay)<BR>- New logic to use the two analog EEC reset discretes and two igniter<BR>voltages in a 2 out of 4 or 3 out of 4 voting scheme<BR>• VBV Disagree Fault Tolerance<BR>- Disagree fault threshold to be changed from a constant 4 degrees to a<BR>variable as a function of VBV door position<BR>- Maintain current 4 degrees threshold at high power<BR>- Increase threshold at low power to prevent inadvertent VBV disgree faults from<BR>being set<BR>7.B.N Change List (cont.)<BR>CFM56 Operators Conference – May 21 - 22, 2002 CFM Proprietary Data Unauthorized Disclosure Prohibited 5<BR>7.B.N Change List (cont.)<BR>• N1 trim washout function<BR>- Modify washout function so that trim is ramped out between 103.5% and<BR>103.7% to eliminate ‘flat’ in indicated N1<BR>• New throttle interpolation curves for new high altitude ratings<BR>- New interpolation points used with new ratings in order to maintain thrust<BR>sensitivity requirements<BR>• Modification to quick windmill relight EGT redline inhibit logic<BR>- Latches quick windmill relight timer threshold<BR>- Prevents EGT redline inhibit once start determined not to be a quick windmill relight<BR>- Addresses potential for erroneous redline indication during over temperature<BR>events<BR>• Modification to burner staging valve and main staging valve driver logic<BR>- When opening the MSV Channel-A and Channel-B will drive the solenoid for<BR>two seconds (DAC only)<BR>- When closing the BSV channel-a and channel-b will drive the solenoid for two<BR>seconds (SAC only)<BR>- After two seconds the channel-in-control will keep the solenoid energized<BR>until required to de-energize :victory: :victory: 谢谢楼主，坚决顶！ CFM56-7 7.B.N. Software Version cfm56-7的资料 收下了:) 看看。。。。。。。。。。。。。。。。。。。 CFM56-7 7.B.N. Software Version
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