- Difficulty date
- August 22, 2013
- Submitted
- August 22, 2013
- Operation
- Air carrier
- Make and model
- Boeing 737990ER
- Aircraft serial
- 41730
- Aircraft time
- 3,209 hours, 1,021 cycles
- Part
- Probe
- Part number
- TC29604
- Condition
- Reads High
- Location
- Nr 1 Engine
- Stage of operation
- IN
- How discovered
- V
- Nature of condition
- N
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIAGNOSTIC REPORTS NR 1 ENGINE TREND DATA SHOWS A SHIFT IN DELTA CRUISE AND TAKEOFF MARGIN INDICATIVE OF EGT INDICATION ERRORS. ACFT GROUNDED. PERFORMED RESISTANCE CKS IAW AMM REF TASK 77-21-01-200-801-F00. FOUND S4 PROBE READING HIGH RESISTANCE. REPLACED T49.5 (S4) PROBE IAW AMM REF 77-21-01-801/77-32-01-000-801. T49.5 (S4) PROBE PASSED INSTALLATION TEST REF AMM TASK 71-00-00-800-811-FOO.