SDR ASAA2016092018093

Service difficulty report · Probe · Boeing 737990ER

Difficulty date: September 20, 2016
Submitted: September 26, 2016
Operation: Air carrier
Aircraft: N474AS
Make and model: Boeing 737990ER
Aircraft serial: 40715
Aircraft time: 4,934 hours, 1,616 cycles
System (JASC): 7722 · Engine EGT/TIT Indicating System
Part: Probe
Part number: TC29603
Condition: Out Of Tolerance
Location: Nr 2 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

NR 2 ENGINE HAD ECONOMIC FAULT CODE 77-20872, TOP LT EGT SIGNAL OUT OF RANGE. ACFT GROUNDED. VERIFIED DISCREPANCY T49.5 INPUT MONITORING PAGE SHOWS S4 SHOWING DASHES. PERFORMED EGT SYSTEM INSPECTION, IAW AMM 77-21-01. FOUND S4 OUT OF TOLERANCE, IAW AMM 77-21-01. S4 T49.5 PROBE REMOVED & REPLACED, IAW AMM 77-21-01, OPS NORMAL. GROUND VERIFICATION CHECKED GOOD.