SDR ASAA2018062425226

Service difficulty report · Probe · Boeing 737890

Difficulty date: June 24, 2018
Submitted: June 28, 2018
Operation: Air carrier
Aircraft: N514AS
Make and model: Boeing 737890
Aircraft serial: 35193
Aircraft time: 37,370 hours, 11,217 cycles
System (JASC): 7722 · Engine EGT/TIT Indicating System
Part: Probe
Condition: Dirty
Location: Egt System
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

DURING A NR 2 ENGINE BITE TEST, SHOWS ECONOMIC FAULT 77-20872. THE TOP LEFT EGT SIGNAL OUT OF RANGE. ACFT GROUNDED. VERIFIED FAULT WAS STILL ACTIVE. ALTERNATE DEACTIVATION APPLIED IAW CHAPTER 5, TABLE 3, ITEM 1. ACCOMPLISHED AN EGT SYSTEM INSPECTION IAW AMM 77-21-01-200-801-F00. FOUND HIGH RESISTANCE READINGS ON THE S4 SECTOR. PERFORMED AN EGT SYSTEM CLEANING IAW AMM 77-21-00-140-801. ACCOMPLISHED THE EGT SYSTEM INSPECTION AGAIN AND ALL READINGS WERE NOW WITHIN LIMITS. EEC TEST PASSED.