Los angeles center controller reported descending an aircraft below the minimum en route altitude.

Attributes
ACN	1624766
Time
Date	201903
Local Time Of Day	1201-1800
Place
Locale Reference	ZLA.ARTCC
State Reference	CA
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 135
Flight Phase	Descent
Route In Use	STAR FASTO 2
Flight Plan	IFR
Person 1
Function	Enroute
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 27
Events
Anomaly	ATC Issue All Types Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT

Narrative:

Aircraft X at 10;000 feet northwest of lhs on the bfl FASTO2 arrival; lhs transition. A faster aircraft was overtaking 10;000 feet; so I coordinated with bfl TRACON to descend aircraft X to 9;000 feet. My belief being that the MEA on that route segment was 9;000 feet. However; immediately after issuing 9;000 feet I had doubts and looked at the fasto two chart and saw that the MEA is 10;000 feet; so I climbed aircraft X back to 10;000 feet. The lowest altitude I observed aircraft X mode C; was 9;500 feet.

Original NASA ASRS Text

Title: Los Angeles Center Controller reported descending an aircraft below the Minimum En route Altitude.

Narrative: Aircraft X AT 10;000 feet northwest of LHS on the BFL FASTO2 ARRIVAL; LHS TRANSITION. A faster aircraft was overtaking 10;000 feet; so I coordinated with BFL TRACON to descend Aircraft X to 9;000 feet. My belief being that the MEA on that route segment was 9;000 feet. However; immediately after issuing 9;000 feet I had doubts and looked at the FASTO TWO chart and saw that the MEA is 10;000 feet; so I climbed Aircraft X back to 10;000 feet. The lowest altitude I observed Aircraft X MODE C; was 9;500 feet.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.