SDR ASAA2020082103055

Service difficulty report · Probe · Boeing 737990ER

Difficulty date: August 20, 2020
Submitted: August 21, 2020
Operation: Air carrier
Aircraft: N433AS
Make and model: Boeing 737990ER
Aircraft serial: 41704
Aircraft time: 26,381 hours, 8,426 cycles
Engine: Cfmint CFM567B27E
System (JASC): 7720 · Engine Temperature Indicating System
Part: Probe
Part number: TC29603
Condition: Out Of Limits
Location: Nr 1 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

REF W.O. 1843189. DURING EEC BITE CHECK FOLLOWING NR 1 ENG, EGT PROBE CLEANING DISCOVERED NR 4 EGT PROBE READING OUT OF LIMIT HIGH. GROUNDED - YES. ALT DEACTIVATION PROC ACCOMPLISHED, PER CH. 5 TABLE 3. 6 CBS PULLED AND TAGGED. REPLACED NR 4 EGT PROBE ASSY ON LT ENGINE, IAW B737-900 AMM 77-21-01. OP CHKS GOOD, RESTORED A/C TO NORMAL CONFIG. 6 CBS RESET.