# SDR ASAA2012091292877

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 1, 2012
- Submitted: September 18, 2012
- Operation: Air carrier
- Aircraft: [N581AS](https://openairdocs.org/aircraft/N581AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35188
- Aircraft time: 20,525 hours, 6,364 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [7720 · Engine Temperature Indicating System](https://openairdocs.org/jasc/7720)
- Part: Probe
- Part number: TC29604
- Condition: Faulty
- Location: Nr 2 Engine
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2012091292877

## Discrepancy

MANUFACTURER DIAGNOSTICS REPORTED, NR 2 ENGINE TREND DATA SHOWS A SHIFT IN EGT HOT DAY MARGIN.  ALL OTHER PARAMETERS NORMAL.  EGT INDICATION ERRORS ARE SUSPECT.  ACFT GROUNDED.  FOUND NR 2 ENG HAD LOGGED FAULT CODE NR 77-20872 TOP LT EGT OUT OF RANGE, ON LAST 6 FLT LEGS.  COMPLETED NR 2 ENGINE EGT CLEANING REF MM 77-21-00, REPLACED TOP LT (S4) T49.5 PROBE REF MM77-21-01. OPS CHECKED NORMAL,

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.