SDR ASAA2018053024860

Service difficulty report · Probe · Boeing 737890

Difficulty date: May 30, 2018
Submitted: May 31, 2018
Operation: Air carrier
Aircraft: N506AS
Make and model: Boeing 737890
Aircraft serial: 35690
Aircraft time: 37,955 hours, 11,635 cycles
Engine: Cfmint CFM567B27
System (JASC): 7720 · Engine Temperature Indicating System
Part: Probe
Part number: TC29604
Condition: Malfunctioned
Location: Nr 1 Egt
Stage of operation: NR
How discovered: O
Nature of condition: N
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

NR 1 ENGINE EGT WAS ALWAYS HIGHER THAN NR 2 ENGINE EGT BY AT LEAST 36 C, DURING TAKEOFF ROLL, NR 1 EGT GAUGE INDICATED SOLID RED FOR LESS THAN ONE MINUTE. ACFT GROUNDED. IAW TSR 701846. REPLACED THE TOP LEFT EGT T49.5 PROBE IAW AMM 77-21-01, PERFORMED POWER ASSURANCE CHECKS, FOUND NORMAL IAW AMM 71-00-00, GROUND VERIFICATION SUCCESSFUL.