SDR ASAA2020010631789

Service difficulty report · Probe · Boeing 737890

Difficulty date: January 3, 2020
Submitted: January 7, 2020
Operation: Air carrier
Aircraft: N532AS
Make and model: Boeing 737890
Aircraft serial: 36346
Aircraft time: 36,616 hours, 10,903 cycles
Engine: Cfmint CFM567B27
System (JASC): 7722 · Engine EGT/TIT Indicating System
Part: Probe
Part number: TC29603
Condition: Defective
Location: Nr 1 Engine
Stage of operation: NR
How discovered: O
Nature of condition: N
Precautionary procedure: K

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

What was found

#1 ENGINE EGT SHOWS RED BOX ON ENGINE SHUTDOWN. GROUNDED - YES. ACCOMPLISHED EEC TEST PER B737-800 AMM 73-21-00-700-804-F00. PERFORMED INPUT MONITORING OF THE T49.5 SYSTEM AND NOTICED S4 TEMPERATURE WAS READING A HIGH. REMOVED AND REPLACED S4 PROBE IAW AMM 77-21-01-000/400. ACCOMPLISHED EEC TEST. TEST PASSED. PERFORMED INPUT MONITORING OF THE T49.5 SYSTEM AND S4 TEMPERATURES WITHIN RANGE. ACCOMPLISHED POWER ASSURANCE CK REF AMM 70-00-00-700-813-F00 NO DEFECT FOUND.