Air carrier captain reported entering 'kline' into the FMS instead of the correct spelling 'klyne.' ...

Attributes
ACN	1430645
Time
Date	201703
Local Time Of Day	0001-0600
Place
Locale Reference	ZOB.ARTCC
State Reference	OH
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 100 Flight Crew Total 20000 Flight Crew Type 2000
Events
Anomaly	Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

Enroute to rod; ATC instructed us to amend our clearance: direct to klyne then direct to djb and then filed route. I entered kline as the cleared to fix and it appeared on the FMS as reasonable slight turn left of 20 degrees approximately 40 NM ahead. The first officer agreed and I executed the turn. After a few moments ATC asked if we were proceeding to klyne at which time I reentered fix as klyne and saw that it was same relative distance from our original position but instead was approximately 20 degrees right turn. We made the correction with no further issues. No traffic conflict occurred. Due to the close proximity of these two identically pronounced fixes; it would be advised that one of the two fixes should be renamed.

Original NASA ASRS Text

Title: Air carrier Captain reported entering 'KLINE' into the FMS instead of the correct spelling 'KLYNE.' The two fixes are in close proximity and the error was not initially apparent.

Narrative: Enroute to ROD; ATC instructed us to amend our clearance: direct to KLYNE then direct to DJB and then filed route. I entered KLINE as the cleared to fix and it appeared on the FMS as reasonable slight turn left of 20 degrees approximately 40 NM ahead. The first officer agreed and I executed the turn. After a few moments ATC asked if we were proceeding to KLYNE at which time I reentered fix as KLYNE and saw that it was same relative distance from our original position but instead was approximately 20 degrees right turn. We made the correction with no further issues. No traffic conflict occurred. Due to the close proximity of these two identically pronounced fixes; it would be advised that one of the two fixes should be renamed.

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.

Air carrier captain reported entering 'kline' into the FMS instead of the correct spelling 'klyne.' the two fixes are in close proximity and the error was not initially apparent.