- Difficulty date
- September 13, 2009
- Submitted
- September 14, 2009
- Operation
- Air carrier
- Make and model
- Boeing 737890
- Aircraft serial
- 35179
- Aircraft time
- 11,826 hours, 3,738 cycles
- Engine
- Cfmint CFM567B27
- Part
- Probe
- Part number
- TC29604
- Condition
- Faulty
- Location
- Nr 1 Engine
- Stage of operation
- IN
- How discovered
- O
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GE DIAGNOSTICS REPORTS NR 1 ENGINE TREND DATA SHOWS A LARGE FLUCTUATION IN EGT HOT DAY MARGIN AND DELTA EGT ALL OTHER PARAMETERS NORMAL. EGT INDICATION ERRORS ARE SUSPECT. PRE CONNECTOR CLEANING VALUES S1 83 S2 43 S3 49 & S4 101. ACCOMPLISHED CONNECTOR CLEANING REF MM 77 21 00 VALUES S1 32 S2 21 S3 25 & S4 48. REMOVED AND REPLACED T495 S4 PROBE REF MM 77 21 01, OPS CHECK NORMAL. VALUES S1 30 S2 20 S3 21 & S4 33. SEAMC NOTIFIED.