A jetstream 4100 crew is reviewing FMS holding procedures on the FMS which defaults to an alternate routing. Aircraft suffers a course deviation with ZNY, ny.

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Attributes
ACN	458290
Time
Date	199912
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : har.vortac
State Reference	PA
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zny.artcc
Operator	common carrier : air carrier
Make Model Name	Jetstream 41
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : cfi pilot : commercial pilot : multi engine
Experience	flight time last 90 days : 240 flight time total : 1670 flight time type : 315
ASRS Report	458290
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : returned to intended or assigned course
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On the night of dec/xa/99 at XA10, flight was en route from iad. During cruise from V377 to har, while reviewing FMS holding procedures, our FMS box changed routing with no warning. The captain and I noticed the discrepancy and changed heading to reintercept the course. The captain then queried ZNY to inform them of the deviation. Center had us proceed direct har VOR and then proceed on course. To prevent future occurrences, we need to change from LNAV to VOR mode before selecting/reviewing other pages/features on FMS box.

Original NASA ASRS Text

Title: A JETSTREAM 4100 CREW IS REVIEWING FMS HOLDING PROCS ON THE FMS WHICH DEFAULTS TO AN ALTERNATE ROUTING. ACFT SUFFERS A COURSE DEV WITH ZNY, NY.

Narrative: ON THE NIGHT OF DEC/XA/99 AT XA10, FLT WAS ENRTE FROM IAD. DURING CRUISE FROM V377 TO HAR, WHILE REVIEWING FMS HOLDING PROCS, OUR FMS BOX CHANGED ROUTING WITH NO WARNING. THE CAPT AND I NOTICED THE DISCREPANCY AND CHANGED HDG TO REINTERCEPT THE COURSE. THE CAPT THEN QUERIED ZNY TO INFORM THEM OF THE DEV. CTR HAD US PROCEED DIRECT HAR VOR AND THEN PROCEED ON COURSE. TO PREVENT FUTURE OCCURRENCES, WE NEED TO CHANGE FROM LNAV TO VOR MODE BEFORE SELECTING/REVIEWING OTHER PAGES/FEATURES ON FMS BOX.

Data retrieved from NASA's ASRS site as of July 2007 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.