H25 captain questions FMS capability regarding unpublished holding pattern entry.

Attributes
ACN	650466
Time
Date	200503
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : tyi.vortac
State Reference	NC
Altitude	msl single value : 27000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc.artcc
Operator	general aviation : corporate
Make Model Name	HS 125 Series
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 120 flight time total : 28500 flight time type : 240
ASRS Report	650466
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : overcame equipment problem
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance Environmental Factor Aircraft
Primary Problem	Aircraft

Narrative:

We were about 40-45 mins into the flight when the controller cleared us to tyi VOR; well off of our flight plan; and gave holding instructions. The hold was to the southwest of tyi on the 249 degree radial. We were flying with both honeywell FMS's in the 'track up' mode. By the time we got to tyi and set up the holding pattern in the FMS; we were well past the VOR. The controller told us to fly a southwest heading until we were southwest of the VOR; then enter holding. The FMS simply could not figure the problem out. After several 'near errors;' I abandoned the FMS and flew the pattern manually with raw data. A combination of very high winds; a 'clunky' FMS -- I have flown vastly superior honeywell FMS's on the B757/767/777 and MD11 -- and 'off the wall' holding instructions; late in the game; resulted in a less than precise holding pattern.

Original NASA ASRS Text

Title: H25 CAPT QUESTIONS FMS CAPABILITY REGARDING UNPUBLISHED HOLDING PATTERN ENTRY.

Narrative: WE WERE ABOUT 40-45 MINS INTO THE FLT WHEN THE CTLR CLRED US TO TYI VOR; WELL OFF OF OUR FLT PLAN; AND GAVE HOLDING INSTRUCTIONS. THE HOLD WAS TO THE SW OF TYI ON THE 249 DEG RADIAL. WE WERE FLYING WITH BOTH HONEYWELL FMS'S IN THE 'TRACK UP' MODE. BY THE TIME WE GOT TO TYI AND SET UP THE HOLDING PATTERN IN THE FMS; WE WERE WELL PAST THE VOR. THE CTLR TOLD US TO FLY A SW HDG UNTIL WE WERE SW OF THE VOR; THEN ENTER HOLDING. THE FMS SIMPLY COULD NOT FIGURE THE PROB OUT. AFTER SEVERAL 'NEAR ERRORS;' I ABANDONED THE FMS AND FLEW THE PATTERN MANUALLY WITH RAW DATA. A COMBINATION OF VERY HIGH WINDS; A 'CLUNKY' FMS -- I HAVE FLOWN VASTLY SUPERIOR HONEYWELL FMS'S ON THE B757/767/777 AND MD11 -- AND 'OFF THE WALL' HOLDING INSTRUCTIONS; LATE IN THE GAME; RESULTED IN A LESS THAN PRECISE HOLDING PATTERN.

Data retrieved from NASA's ASRS site as of January 2009 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.