ZOA controller experienced operational error at FL370 during non radar oceanic procedures when faili...

Narrative:

During hnl rush; aircraft X and aircraft Y were transferred out. Aircraft X unaware to me had an amendment that changed the eloyi time from XA04Z to XA43Z causing the data block to jump back into hnl's airspace. Aircraft X was at FL370. Aircraft Y had progressed to oakland's airspace at XA11Z with a position report over eloyi. At XA14Z aircraft Y requested lower altitude down to FL350. With traffic at FL360; they were what appeared to be able FL370. I descended aircraft Y to FL370 at XA47Z. Confusion occurred when aircraft X started flashing overdue to eloyi; but when aircraft X was asked for position report; they reported over errot at XA50Z. Expecting a report over eloyi; I questioned the flight and had them confirm position. The position had in fact been errot. Once I had updated the correct position; I climbed aircraft Y up to FL380 and had regained separation at XA10Z. After looking through aircraft X aircraft messages; it appears that a message containing aircraft X's position report had been mistakenly deleted.

Original NASA ASRS Text

Title: ZOA Controller experienced operational error at FL370 during non radar oceanic procedures when failing to note an aircraft position report had inadvertently been deleted.

Narrative: During HNL rush; Aircraft X and Aircraft Y were transferred out. Aircraft X unaware to me had an amendment that changed the ELOYI time from XA04Z to XA43Z causing the data block to jump back into HNL's airspace. Aircraft X was at FL370. Aircraft Y had progressed to Oakland's airspace at XA11Z with a position report over ELOYI. At XA14Z Aircraft Y requested lower altitude down to FL350. With traffic at FL360; they were what appeared to be able FL370. I descended Aircraft Y to FL370 at XA47Z. Confusion occurred when Aircraft X started flashing overdue to ELOYI; but when Aircraft X was asked for position report; they reported over ERROT at XA50Z. Expecting a report over ELOYI; I questioned the flight and had them confirm position. The position had in fact been ERROT. Once I had updated the correct position; I climbed Aircraft Y up to FL380 and had regained separation at XA10Z. After looking through Aircraft X aircraft messages; it appears that a message containing Aircraft X's position report had been mistakenly deleted.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	828157
Time
Date	200903
Local Time Of Day	0601-1200
Place
Locale Reference	ZOA.ARTCC
State Reference	CA
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Aircraft 2
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Non Radar 1
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict

ZOA controller experienced operational error at FL370 during non radar oceanic procedures when failing to note an aircraft position report had inadvertently been deleted.