Light transport heading over north atlantic lost communication then LORAN.

Attributes
ACN	127771
Time
Date	198911
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : cyyr
State Reference	NF
Altitude	msl bound lower : 41000 msl bound upper : 41000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : abq
Operator	common carrier : air taxi
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute airway : czqx
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 120 flight time total : 9000 flight time type : 1500
ASRS Report	127771
Person 2
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	aircraft : equipment problem dissipated
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Crossing atlantic from cyyr to basf. Lost all communications near prawn intersection. Shortly afterwards LORAN started giving bad information. About 15 mins later LORAN went into warning mode and then dropped off completely. The snr indications still showed a strong signal from all required ground stations. LORAN finally started working, still in warning mode, about 45 min to 1 hour later. Communication were reestablished at about the same time.

Original NASA ASRS Text

Title: LTT HEADING OVER NORTH ATLANTIC LOST COM THEN LORAN.

Narrative: XING ATLANTIC FROM CYYR TO BASF. LOST ALL COMS NEAR PRAWN INTXN. SHORTLY AFTERWARDS LORAN STARTED GIVING BAD INFO. ABOUT 15 MINS LATER LORAN WENT INTO WARNING MODE AND THEN DROPPED OFF COMPLETELY. THE SNR INDICATIONS STILL SHOWED A STRONG SIGNAL FROM ALL REQUIRED GND STATIONS. LORAN FINALLY STARTED WORKING, STILL IN WARNING MODE, ABOUT 45 MIN TO 1 HR LATER. COM WERE REESTABLISHED AT ABOUT THE SAME TIME.

Data retrieved from NASA's ASRS site as of August 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.