SDR ASAA2013060495031

Service difficulty report · Probe · Boeing 737890

Difficulty date: June 4, 2013
Submitted: June 11, 2013
Operation: Air carrier
Aircraft: N589AS
Make and model: Boeing 737890
Aircraft serial: 35686
Aircraft time: 21,215 hours, 6,598 cycles
Engine: Cfmint CFM567B27
System (JASC): 7720 · Engine Temperature Indicating System
Part: Probe
Part number: TC29604
Condition: Out Of Limits
Location: Nr 2 Engine
Stage of operation: IN
How discovered: V
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 2 ENGINE TREND DATA SHOWS A SHIFT IN DELTA CRUISE AND TAKEOFF MARGIN INDICATIVE OF EGT INDICATION ERRORS. ACFT GROUNDED. ACCOMPLISHED T49.5 PROBE AND EGT SYS INSPECTION. FOUND T495 S1 EGT TEMP PROBE RESISTANCE VALUES OUT OF LIMITS AMM 77-21-01-200-801-F00. REPLACED T495S1 EGT TEMP PROBE IAW AMM 77-21-01-000, OPS CHECK NORMAL. T49.5 EGT TEMP PROBE READINGS BEFORE/AFTER (S1)180.49/33.40, (S2)133.00/19.11, (S3)129.14/19.15, (S4) 177.56/32.41.