Service difficulty report · Warning Message · Boeing 737890

Difficulty date
June 30, 2017
Submitted
July 3, 2017
Operation
Air carrier
Aircraft
N538AS
Make and model
Boeing 737890
Aircraft serial
41188
Aircraft time
20,295 hours, 5,919 cycles
Engine
Cfmint CFM567B27
Part
Warning Message
Condition
False Activation
Location
Nr 1 Engine N1
Stage of operation
TX
How discovered
9
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

AFTER ENGINE START, BEFORE TAKEOFF. THE NR 1 ENGINE N1 INDICATED 100.8, THE NR 2 ENGINE INDICATED 100.0 PLANNED AND SET 26K MAX POWER TAKEOFF, AFTER CYCLING ENG BLEED SWITCHES MANY TIMES THE NR 1 ENGINE N1 VALUE FINALLY MATCHED NR 2 N1 VALUE AT 100.0, NORMAL INDICATION AND THRUST OCCURED FOR THE REMAINDER OF THE FLIGHT. ACFT GROUNDED. A/T BITE PROCEDURE DONE IAW FIM 22-31-TASK 801, NO CURRENT FAULTS. NO ENGINE PARAMETERS EXCEEDED OR DEFECTS NOTED, ACCOMPLISHED AVM BITE CHECK, NO FAULTS LOGGED IAW FIM 77-31- TASK 801, ACCOMPLISHED EEC BITE TEST NO DEFECTS NOTED IAW FIM 73-00-TASK 801, NO HISTORY N1 INDICATION NOTED.