CFM Ignition System Reliability
**** Hidden Message ***** February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 1<BR>Ignition System Reliability<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 2<BR>Ignition System Reliability<BR>• Ignition System is third leading cause of D&Cs<BR>- Behind HMU HPSOV switches and FMV faults<BR>- Includes A/C start brake assembly, A/C and engine harnesses, EEC,<BR>exciter, lead and plug<BR>- Engine hardware excluding plugs continues to be No Fault Found<BR>• CFMI and Boeing studied 117 Event Reports (1-98 to 7-00)<BR>- 58 of these events resulted in D&Cs<BR>• Data typically insufficient for exact causal determination<BR>- Squawks were intermittent, no follow up reports, plug time not tracked<BR>• Based on the E/R narrative and a predetermined set of ground rules, the team<BR>assigned cause as:<BR>- Ignitor plug<BR>- A/C switch (start brake)<BR>- Can’t determine<BR>- Other<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 3<BR>Potential Improvement Areas for Ignition System Dispatch Reliability<BR>• Improved Troubleshooting EEC SW version 7.B.M1<BR>- FIM procedure 80-06, tasks 801 through 805<BR>• Use of Input Monitoring to determine if switches are in commanded state<BR>D & Cs by Ignition Side<BR>Right<BR>Left 57%<BR>23%<BR>Can't Tell<BR>16%<BR>Both<BR>4%<BR>Breakdown of Ignition SystemD&C's<BR>Suspect Plug<BR>27%<BR>Suspect Switch<BR>33%<BR>Can't Tell<BR>22%<BR>Other<BR>18% Ignition D&C Repeats<BR>D&C Repeat<BR>16%<BR>No D&C<BR>Repeat<BR>84%<BR>Ignition System Reliability<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 4<BR>Potential Improvement Areas for Ignition System Dispatch Reliability<BR>• Plug Soft Time<BR>- Significant improvement, recommend 1000 cyc (CESM 006, revision 3)<BR>• Plug costs ~ 25¢ per engine cycle vs thousands of dollars per D&C<BR>- Unison offers a service to its customers to determine if there is<BR>significant life remaining on igniter plugs (FEB-2002 FHA)<BR>• Adjust soft time depending on results<BR>• For $9 per plug, part will be assessed for life remaining<BR>» If 50% or more life remains, plug will be returned to customer<BR>» If less than 50% life remains, part will be scrapped<BR>• Send plugs only in groups of 25 or more to<BR>» P.O. required<BR>Unison Industries<BR>ATTN: Debbie Reid<BR>7575 Baymeadows Way<BR>Jacksonville, FL 32256<BR>Ignition System Reliability<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 5<BR>Potential Improvement Areas for Ignition System Dispatch Reliability<BR>• A/C Start Brake Assembly - Significant Improvement<BR>- Refer to Boeing Service Letter 737-SL-76-020 and Maintenance Tip<BR>737MT73-001<BR>• A/C Automatic Ignition Transfer Relay Option<BR>- Boeing offers an option that allows dispatch with an inoperative right ignition<BR>system but does not require opening the fan cowls<BR>• Contact your Boeing Customer Engineering representative for<BR>production cost and availability information<BR>• Contact Boeing Airplane Services for retrofit cost and availability<BR>information at airplaneservices@boeing.com<BR>- Reduce D&Cs 30+ percent<BR>Ignition System Reliability<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 6<BR>CFM56-7B Fleet - Engine Cycles<BR>0<BR>50<BR>100<BR>150<BR>200<BR>250<BR>300<BR>350<BR>0<BR>50<BR>100<BR>150<BR>200<BR>250<BR>300<BR>350<BR>Number of Engines<BR>ECSN Distribution :victory: :victory: CFM Ignition System Reliability
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