<< >> NASA ASRS Report 611290, February 2004

A BE40 first officer claimed that his aircraft is insufficiently equipped to navigation precisely which caused a heading deviation in N90 airspace.

Attributes
ACN	611290
Time
Date	200402
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : hpn.airport
State Reference	NY
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90.tracon
Operator	general aviation : corporate
Make Model Name	Beechjet 400
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : westchester 1
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 90 flight time total : 3000 flight time type : 1500
ASRS Report	611290
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical non adherence : published procedure non adherence : far non adherence : company policies non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued advisory controller : issued new clearance
Consequence	other other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Aircraft has an FMS (single) with no GPS. Uses VOR/DME to update position. (Ams-850 full keypad, limited database). In this aircraft, as equipped, it is common to have a yellow dead reckoning flag until aircraft is airborne and able to update its position. During the westchester 1 departure (hpn) while flying the 295 degree heading as depicted in the STAR, we were given a right turn direct merit. FMS course needle centered 056 degree course to merit, dead reckoning flag cleared, then reappeared. ATC inquired our heading to merit. We responded 055 degrees. Controller said 'that's nowhere near merit, turn right 110 degrees.' we informed ATC that we were having FMS problems. We were given a 90 degree heading to intercept lga 055 degree radial to merit. The rest of the flight was uneventful.

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Original NASA ASRS Text

Title: A BE40 FO CLAIMED THAT HIS ACFT IS INSUFFICIENTLY EQUIPPED TO NAV PRECISELY WHICH CAUSED A HDG DEV IN N90 AIRSPACE.

Narrative: ACFT HAS AN FMS (SINGLE) WITH NO GPS. USES VOR/DME TO UPDATE POS. (AMS-850 FULL KEYPAD, LIMITED DATABASE). IN THIS ACFT, AS EQUIPPED, IT IS COMMON TO HAVE A YELLOW DEAD RECKONING FLAG UNTIL ACFT IS AIRBORNE AND ABLE TO UPDATE ITS POS. DURING THE WESTCHESTER 1 DEP (HPN) WHILE FLYING THE 295 DEG HDG AS DEPICTED IN THE STAR, WE WERE GIVEN A R TURN DIRECT MERIT. FMS COURSE NEEDLE CTRED 056 DEG COURSE TO MERIT, DEAD RECKONING FLAG CLRED, THEN REAPPEARED. ATC INQUIRED OUR HDG TO MERIT. WE RESPONDED 055 DEGS. CTLR SAID 'THAT'S NOWHERE NEAR MERIT, TURN R 110 DEGS.' WE INFORMED ATC THAT WE WERE HAVING FMS PROBS. WE WERE GIVEN A 90 DEG HDG TO INTERCEPT LGA 055 DEG RADIAL TO MERIT. THE REST OF THE FLT WAS UNEVENTFUL.

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.