A cpr aircraft, using omega navigation, failed to make an altitude crossing at an intersection.

Attributes
ACN	224743
Time
Date	199210
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : bdl
State Reference	CT
Altitude	msl bound lower : 19000 msl bound upper : 22000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zbw
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 75 flight time total : 8000 flight time type : 4000
ASRS Report	224743
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : atp
Experience	flight time last 90 days : 75 flight time total : 3600 flight time type : 800
ASRS Report	224424
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : crossing restriction not met non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

While following a clearance to cross 55 mi west of stela intersection at FL190, ZBW asked at 65 west of the intersection if we were going to meet the crossing restriction. We answered yes. At 60 mi west of stela, we were asked our distance from stela and altitude. We stated FL220 and 60 west. While still descending, we were told to turn 20-30 degrees to the left. Upon reaching the new heading, we were leveling at FL190 at 55 west of stala. We were then cleared direct stela. The only way we had to identify the 55 mi west of stela was on our VLF omega. The VLF omega appeared to be operating normally. But from the questioning of the controller, there appears to be a difference on the distance west of stela between what we were indicating and what the controller was seeing.

Original NASA ASRS Text

Title: A CPR ACFT, USING OMEGA NAV, FAILED TO MAKE AN ALT XING AT AN INTXN.

Narrative: WHILE FOLLOWING A CLRNC TO CROSS 55 MI W OF STELA INTXN AT FL190, ZBW ASKED AT 65 W OF THE INTXN IF WE WERE GOING TO MEET THE XING RESTRICTION. WE ANSWERED YES. AT 60 MI W OF STELA, WE WERE ASKED OUR DISTANCE FROM STELA AND ALT. WE STATED FL220 AND 60 W. WHILE STILL DSNDING, WE WERE TOLD TO TURN 20-30 DEGS TO THE L. UPON REACHING THE NEW HDG, WE WERE LEVELING AT FL190 AT 55 W OF STALA. WE WERE THEN CLRED DIRECT STELA. THE ONLY WAY WE HAD TO IDENT THE 55 MI W OF STELA WAS ON OUR VLF OMEGA. THE VLF OMEGA APPEARED TO BE OPERATING NORMALLY. BUT FROM THE QUESTIONING OF THE CTLR, THERE APPEARS TO BE A DIFFERENCE ON THE DISTANCE W OF STELA BTWN WHAT WE WERE INDICATING AND WHAT THE CTLR WAS SEEING.

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.