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A widebody transport air carrier crew had a navigation error with their inertial navigation system (3) causing a track deviation.
| Attributes | |
| ACN | 210732 |
| Time | |
| Date | 199205 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : xac |
| State Reference | FO |
| Altitude | agl bound lower : 37000 agl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : rjtg |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute : other oceanic enroute : pacific enroute airway : rjtg |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 170 flight time total : 17000 flight time type : 210 |
| ASRS Report | 210732 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 7650 flight time type : 2100 |
| ASRS Report | 211014 |
| Events | |
| Anomaly | non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : overcame equipment problem other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
INS error (type) put aircraft 5 mi south of course after 6 hours of flight from hnl to ngo. We had no indication of the extent of the error until tokyo control informed us we were 5 mi south. No conflicts involved. INS #1 did show a no update message for about 1 hour en route, but it still was in close agreement with the other 2. Supplemental information from acn 211014. Captain's leg into ngo. Our clearance was: moray otr 15 (direct) smolt otr 16 (direct) sunns direct oshima (xac). As we approached smolt, tokyo control informed us we were in radar contact and they showed us 5 mi south of course paralleling our desired track. Our clearance was direct oshima from sunns. I emphatically suggested to the captain he needed to forget about the #1 INS and just fly the airways direct to oshima, using VOR only. I stated again, I felt we should request direct oshima, (xac) navigate using the vors only, forget the #1 INS and get ready for our first descent and arrival in ngo. The top of descent point was with a few mi of xac. He was fooling around, attempting to update an INS when, we should have been busy getting us back on course and preparing for the descent. I truly felt my input was not being heard. On the return leg from ngo to hnl I brought the subject up. He quickly changed the subject. I felt I was not being heard. A serious lack of CRM was happening.
Original NASA ASRS Text
Title: A WDB ACR CREW HAD A NAV ERROR WITH THEIR INERTIAL NAV SYS (3) CAUSING A TRACK DEV.
Narrative: INS ERROR (TYPE) PUT ACFT 5 MI S OF COURSE AFTER 6 HRS OF FLT FROM HNL TO NGO. WE HAD NO INDICATION OF THE EXTENT OF THE ERROR UNTIL TOKYO CTL INFORMED US WE WERE 5 MI S. NO CONFLICTS INVOLVED. INS #1 DID SHOW A NO UPDATE MESSAGE FOR ABOUT 1 HR ENRTE, BUT IT STILL WAS IN CLOSE AGREEMENT WITH THE OTHER 2. SUPPLEMENTAL INFO FROM ACN 211014. CAPT'S LEG INTO NGO. OUR CLRNC WAS: MORAY OTR 15 (DIRECT) SMOLT OTR 16 (DIRECT) SUNNS DIRECT OSHIMA (XAC). AS WE APCHED SMOLT, TOKYO CTL INFORMED US WE WERE IN RADAR CONTACT AND THEY SHOWED US 5 MI S OF COURSE PARALLELING OUR DESIRED TRACK. OUR CLRNC WAS DIRECT OSHIMA FROM SUNNS. I EMPHATICALLY SUGGESTED TO THE CAPT HE NEEDED TO FORGET ABOUT THE #1 INS AND JUST FLY THE AIRWAYS DIRECT TO OSHIMA, USING VOR ONLY. I STATED AGAIN, I FELT WE SHOULD REQUEST DIRECT OSHIMA, (XAC) NAVIGATE USING THE VORS ONLY, FORGET THE #1 INS AND GET READY FOR OUR FIRST DSCNT AND ARR IN NGO. THE TOP OF DSCNT POINT WAS WITH A FEW MI OF XAC. HE WAS FOOLING AROUND, ATTEMPTING TO UPDATE AN INS WHEN, WE SHOULD HAVE BEEN BUSY GETTING US BACK ON COURSE AND PREPARING FOR THE DSCNT. I TRULY FELT MY INPUT WAS NOT BEING HEARD. ON THE RETURN LEG FROM NGO TO HNL I BROUGHT THE SUBJECT UP. HE QUICKLY CHANGED THE SUBJECT. I FELT I WAS NOT BEING HEARD. A SERIOUS LACK OF CRM WAS HAPPENING.
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.