CFM Oil Temperature Sensor Issue

航空发表于 2011-4-15 19:18:56

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航空发表于 2011-4-15 19:19:09

February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 1 Oil Temperature Sensor Issue February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 2 Oil Temperature Sensor Issue Components & Accessories Background • Five commanded IFSD’s following Low Oil Pressure Warning / Low Oil Qty • Ground inspection showed oil temperature sensor separated from housing – All the oil expelled from the open port • Event engines age less than 850 cycles since new • Events led to extensive engine damages (bearings failure) – Low oil pressure warning delayed due to invalid PEO February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 3 Root Cause • TEO Sensor with attachment bolts and self locking inserts disengaged all together and holes threads in housing found sheared • Insert over torqued during assembly (or maintenance)  damage to the insert – Engine oil pressure cyclic load on the probe  shearing of the insert threads and to back off the probe – lack of robustness of the insert design  sensitive to over torque Insert Bolt Sheared threads Root Cause Understood = Insert Sensitive to Over Torque Oil Temperature Sensor Issue Components & Accessories February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 4 Production Final Fix • Mechanical Fix  A new housing design, more robust, new insert definition has been implemented – With this new insert, six (6) threads are engaged instead of three (3) on the current housing. – The bolt becomes the weak link in this assembly (demonstrated by test) – On new production engines since May 2001 (engine 88T-481 and up)  SB 72-0298 issued 5 Jul 2001 • Software Fix  Lower limit for PEO signals reduced to ensure low oil pressure warning activated in worst case scenario (sudden oil supply line open to ambient) – Introduced in 7BM1 software (1853M79P20) - S/B 73-0064, 31 Jul 2001 Oil Temperature Sensor Issue Components & Accessories February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 5 In-Service Plan • Containment Plan  CFM recommended Implementation of lockwire between probe and housing for engines having accumulated less than 1,000 cycles since new, or for those on which a maintenance action on the TEO Sensor had been performed – S/B 72-A0336 issued on 26 Jun 2001  CFM recommend implementation of lockwire on all field engines regardless of age – S/B 72-A0336 to be revised  Target date Mar 2002 Oil Temperature Sensor Issue Components & Accessories February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 6 In-service Final Fix Plan  CFM recommends mechanical final fix implementation during engine shop visit to replace the interim fix – This can be done by  Installation of the new housing configuration (P/N 805) with longer inserts  Installation of a current/reworked housing (P/N 804 -> P/N TBD) » Valid for a non damaged housing » Rework to be released in Mar 2002 » S/B 72-A0336 to be revised in Mar 2002 Oil Temperature Sensor Issue Components & Accessories

979199501 发表于 2011-4-16 00:01:07

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Arm
Proposed Switch Configuration
Current Double Throw
Proposed Single Throw
Run contact eliminated
Introduction Logistics
• CFMI/Boeing/Honeywell laun

kinran 发表于 2011-6-4 23:17:33

:victory: :victory:

bocome 发表于 2011-7-31 04:52:47

CFM Oil Temperature Sensor Issue

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CFM Oil Temperature Sensor Issue

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