CFM Components and Accessories Electrical Harnesses

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October 2003 WTT Face to Face in Seville-Spain CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 􀂊420
Components and Accessories
Electrical Harnesses
•EGT System Faults
Thierry OrdinesCFM Product Support Engineering
October 2003 WTT Face to Face in Seville-Spain CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 􀂊421
EGT System FaultsBackground•Increased number of EGT indication faults reported (EGT shift and/or Fault Mess.)•in few cases, fault return few month laterInvestigation plan / status•field events analysis on going: 74 reported events since Jan.2002•Average engine age : 4500 Hrs / 2800 Cy since new•24 cases with EGT indication affected (16 with Maint.Mess also) •Over 74 squawks (53 engines) led to
• replaced probes or harnesses serial number not reported in most cases
36185114010203040T49.5 Probe ReplacedConnectors CleaningHarness ReplacedLoose Connector TightenUnknown Maint. ActionQty of Maint. Actions(3 CJ9 - 2 J9)
October 2003 WTT Face to Face in Seville-Spain CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 􀂊422
EGT System FaultsInvestigation plan / status (cont’d)•Maintenance action effect•Connectors cleaning is efficient in most cases•Fault repeated in very few cases 􀃂not all connectors may have been cleaned•T49.5 Probe replacement appears efficient in most cases, but….•None received at vendor found faultyLarge amount of faults corrected by connectors disconnect/cleaning/reconnect.0%10%20%30%40%50%60%70%80%90%100%T49.5 Probe ReplacedConnectors CleaningHarness ReplacedLoose Connector TightenUnknown Maint. Actionno repeatrepeat(3 CJ9 - 2 J9)
October 2003 WTT Face to Face in Seville-Spain CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 􀂊423
EGT System FaultsInvestigation plan / status (cont’d)•Hardware shop findings•Qty 98 T49.5 probes tested at vendor for Y2002 & 2003•much more than quantity removed•none had dual thermocouple failure•63% are NFF•34% (qty 33) found with either one open thermocouple or low insulation resistance•single open thermocouple (Qty 8) has no effect on Probe output signal.•low insulation resistance will lower Probe output signal but notenough
to cause a Maint. Message
• Qty 4 Harnesses received at manufacturer for fault
• all 4 shows damaged connectors.
No T49.5 Probes failuremode causing faults identified.
October 2003 WTT Face to Face in Seville-Spain CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 􀂊424
EGT System FaultsInvestigation plan / status (cont’d)•Multi-time loosers•5/11 engines had multi-probes replacement (same location-consecutive)•disconnect/reconnect believe to clear the fault•3/11 cleaning finally corrected the fault01234876750888900888671889339891187888484Maint. Action NbcleaningT49.5 Probe replacedJ9 Harness replacedUnknownConnectors disconnect/cleaning/reconnect efficient in correcting fault.
October 2003 WTT Face to Face in Seville-Spain CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 􀂊425
EGT System FaultsInvestigation plan / status (cont’d)•Common point to reviewed events shows•Connectors opening and cleaning appears being the most efficientaction to correct fault.•CFM is developing a connectors investigation program;•Connector design review•Investigation of complete set of field harnesses (CJ9+J9)•to be removed from faulty engine w/o disturbing connectors (no cleaning)•airlines will be contacted to retrieve hardware•will mainly focus on connectors condition•I061 item / EGT connector cleaning•FIM procedures reviewed and improved•connector cleaning added when missing•dedicated tasks for either M.M or EGT indication problem
• revised FIM tasks will be incorporated in Oct.2003 FIM rev.

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