Service difficulty report · Switch · Boeing 737990ER

Difficulty date
September 10, 2017
Submitted
September 11, 2017
Operation
Air carrier
Aircraft
N423AS
Make and model
Boeing 737990ER
Aircraft serial
35206
Aircraft time
17,517 hours, 5,787 cycles
Engine
Cfmint CFM567B27E
Part
Switch
Part number
2688072
Condition
Failed
Location
Nr 1 Engine
Stage of operation
IN
How discovered
9
Nature of condition
J
Precautionary procedure
K

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

What was found

NR 2 ENGINE, ENG VALVE CLOSED LIGHT IS BRIGHT WITH START LEVER IN CUTOFF. ACFT GROUNDED. PERFORMED FIM 73-06, TASK 804, FOUND THE HPSOV SWITCH RESISTANCE VALUES OUT OF LIMITS. REMOVED AND REPLACED HPSOV SWITCH IAW AMM 73-21-09/401. OPS CHECKED AND REPAIR CONFIRMATION SATISFACTORY. AIRCRAFT RETURNED TO NORMAL CONFIGURATION.