SDR ASAA2013062095155

Service difficulty report · Probe · Boeing 737890

Difficulty date: June 20, 2013
Submitted: June 20, 2013
Operation: Air carrier
Aircraft: N563AS
Make and model: Boeing 737890
Aircraft serial: 35180
Aircraft time: 25,500 hours, 7,855 cycles
System (JASC): 7720 · Engine Temperature Indicating System
Part: Probe
Part number: TC29604
Condition: Dirty
Location: Nr 1 Engine
Stage of operation: IN
How discovered: 9
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

DIAGNOSTICS REPORTS NR 1 ENGINE TREND DATA SHOWS A SHIFT IN DELTA CRUISE AND TAKE-OFF MARGIN INDICATIVE OF EGT INDICATION ERRORS. ACFT GROUNDED. FOUND T 49.5 SENSORS (EGT) S1 AND S4 TO BE HIGH (BEFORE READINGS) S1- 92.88, S2-48.40, S3-52.09, AND S4-108.96 CLEANED T 49.5 PROBES, SYS OP CHECKS GOOD, (AFTER READINGS) S1 57.92, S2-34.14, S3-42.27, S4-73.14.