HMU/MSV/BSV Position Faults

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February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 1
HMU/MSV/BSV Position Faults
February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 2
• Main Staging Valve (MSV) Faults
 The MSV Controls the DAC Staging Between 20/25 and 20/20
 The MSV Is Always Closed Fault Is No-Dispatch
 The MSV is Closed when De-energized
 Customers are Experiencing ATOs in Revenue Service
– The MSV Is Always Closed (73-x102n)
– More Than 90% of the Failures are Reported on Channel-B (x=2)
• Burner Staging (BSV) Valve Faults
 The BSV Controls the SAC to run 10 Nozzle or 20 Nozzle
 The BSV Is Always Open Fault Is Short Time Dispatch
 The BSV is Open when De-energized
 Customers are Experiencing BSV Faults in Revenue Service
– The BSV Is Always Open (73-x064n)
– More Than 90% of the Failures are Reported on Channel-B (x=2)
The Same HMU Solenoid is Used for Both BSV and MSV
HMU/MSV/BSV Position Faults
February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 3
• EEC Solenoid Driver Specification
 Output current for the solenoid driver is 330 ma +/- 30 ma
 EEC solenoid driver output range is 300 to 360 ma
 EEC solenoid driver output is a constant current
– ATP results show EEC solenoid output driver set to 330 ma
• Honeywell Solenoid Test Results (Solenoid Testing Only)
BECW1303 BECW0617 BECW0446
85oF 300oF 85oF 300oF 85oF 300oF
(29oC 149oC) (29oC 149oC) (29oC 149oC)
Coil-A 264 271 265 268 274 274
Coil-B 270 271 280 283 285 289
Channel-B Solenoid Requires a Higher Pull-in Current Than Channel-A
HMU/MSV/BSV Position Faults
February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 4
• CFMI Test Results From Evendale Test Facility (DAC Configuration)
 SAS HMU BECW1650
– BSV/MSV solenoid pull-in current
– ~300 ma pull-in current required at 120oF fuel temperature
– ~339 ma required to energize the solenoid at 170oF fuel temperature
– Solenoid response has been observed to be delayed as much as 5 sec
– Further Testing Required at Honeywell to determine worst case
• Channel-B Requires Higher Pull-in Current Than Channel-A
 MSV/BSV Solenoid Windings are Axially Mounted
– Channel-A is the inner winding
– Channel-B is the outer winding
• Configuration option available to address BSV Always Open Faults
 Implement Service Bulletin 73-0054
– Disable BSV
– HPTACC Faults Become Economic Rather Than No-Go
CFMI and Honeywell to Define Go-Forward Plan for MSV Faults
HMU/MSV/BSV Position Faults

junbok

谢谢楼组！

kinran

不错不错

bocome

HMU/MSV/BSV Position Faults