CFM Oil Temperature Sensor

航空发表于 2011-4-12 08:59:40

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航空发表于 2011-4-12 09:00:01

Oil Temperature Sensor Oil Temperature Sensor • Oil T° Sensor Disengagement - Background • Investigation • Product Improvements • In-service Plan - Interim - Final • Summary CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 3 Oil Temperature Sensor Background • Five commanded IFSD’s in 2001 • Oil Temperature Sensor disengaged 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 CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 4 Oil Temperature Sensor Oil T° Sensor Oil T° Sensor Housing CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 5 Investigation • TEO Sensor with attachment bolts and self locking inserts disengaged all together • Housing threads found sheared • 2,000 engines have been delivered with Housing P/N 340- 091-804-0 • Oil pressure cyclic load on the probe  back off the probe Oil Temperature Sensor Root Cause Understood: Lack of Robustness of the Housing/insert Design  Sensitive to Over Torque CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 6 Failure Mode Insert Bolt Housing sheared threads Oil Temperature Sensor CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 7 Product Improvements • New insert definition implemented (P/N 340-091- 805-0) - Six (6) threads are engaged instead of three (3) - On engines since May 2001 (engine 88T-481 and up) - SB 72-0298 issued on July 5, 2001 • EEC Software - Lower limit for PEO signals reduced - Introduced in 7BM1 software (1853M79P20) - S/B 73-0064 issued on July 31, 2001 Oil Temperature Sensor CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 8 In-service Plan • Containment Plan - Implementation of lockwire to secure the probe onto the housing - For engines with less than 1,000 cycles since new - S/B 72-A0336 issued on June 26, 2001 • Interim Plan - Implementation of lockwire on all field engines regardless of age - S/B 72-0372 issued in March 2002 Oil Temperature Sensor CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 9 Lockwire to secure Oil T° Sensor onto Oil Sensor Housing Oil Temperature Sensor CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 10 In-service Plan • Final Fix - Mechanical final fix implementation during engine shop visit - Install the new housing configuration (P/N 805) Or - Install a current/reworked housing (P/N 804 -> P/N TBD) - Valid for a non damaged housing - Rework to be released 2nd quarter 2002 - S/B 72-0298 to be revised in 2nd quarter 2002 Oil Temperature Sensor CFM56 Operators Conference – May 22 - 23, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 11 • Five in-service events (IFSD’s) • Root cause is the lack of Housing/Insert design robustness • New insert introduced in production (P/N 340-091-805-0) • Interim field plan is to implement Lockwire on all engines - SB72-0372 issued in March, 2002 • Final In-service plan is to replace or repair old Housing - Repair, and SB to be issued in 2Q 2002 Oil Temperature Sensor Summary

979199501 发表于 2011-4-12 14:26:11

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CFM56-7 Starter Reliability

kinran 发表于 2011-6-4 23:33:16

:victory: :victory:

08032135 发表于 2011-6-6 10:19:10

:lol :lol :lol

bocome 发表于 2011-7-31 03:54:03

CFM Oil Temperature Sensor

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CFM Oil Temperature Sensor

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