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Flight crew inadvertently turned 2 mi earlier while on the SID, which placed them in close proximity of mountainous terrain. This error was a result of using the GPS mileage in lieu of the ILS mileage as displayed on the SID.
| Attributes | |
| ACN | 419880 |
| Time | |
| Date | 199811 |
| Day | Sun |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : vhhk |
| State Reference | FO |
| Altitude | msl bound lower : 2600 msl bound upper : 2600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : vhhk tower : stl |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : sid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 12000 flight time type : 4000 |
| ASRS Report | 419880 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While climbing out of hkg on the perch 1 departure, pilot monitoring called the 7 DME turn point and I initiated turn sbound. Departure control advised we were 'dangerously close to high terrain, turn left to 150 degrees immediately.' it seems that pilot monitoring called turn based on GPS data instead of ILS DME as published, but GPS was leading the intersection by 2 mi, so we actually turned at 5 DME, not 7. Incident occurred as a result of poor departure briefing on my part and my failure to verify position data when told to turn. To preclude this from happening to other pilots in our base, I have notified the chief pilot of the incident and he has agreed to place a notice in the pilot's 'hot read file' warning them of the danger of using the GPS data instead of the published ILS DME.
Original NASA ASRS Text
Title: FLC INADVERTENTLY TURNED 2 MI EARLIER WHILE ON THE SID, WHICH PLACED THEM IN CLOSE PROX OF MOUNTAINOUS TERRAIN. THIS ERROR WAS A RESULT OF USING THE GPS MILEAGE IN LIEU OF THE ILS MILEAGE AS DISPLAYED ON THE SID.
Narrative: WHILE CLBING OUT OF HKG ON THE PERCH 1 DEP, PLT MONITORING CALLED THE 7 DME TURN POINT AND I INITIATED TURN SBOUND. DEP CTL ADVISED WE WERE 'DANGEROUSLY CLOSE TO HIGH TERRAIN, TURN L TO 150 DEGS IMMEDIATELY.' IT SEEMS THAT PLT MONITORING CALLED TURN BASED ON GPS DATA INSTEAD OF ILS DME AS PUBLISHED, BUT GPS WAS LEADING THE INTXN BY 2 MI, SO WE ACTUALLY TURNED AT 5 DME, NOT 7. INCIDENT OCCURRED AS A RESULT OF POOR DEP BRIEFING ON MY PART AND MY FAILURE TO VERIFY POS DATA WHEN TOLD TO TURN. TO PRECLUDE THIS FROM HAPPENING TO OTHER PLTS IN OUR BASE, I HAVE NOTIFIED THE CHIEF PLT OF THE INCIDENT AND HE HAS AGREED TO PLACE A NOTICE IN THE PLT'S 'HOT READ FILE' WARNING THEM OF THE DANGER OF USING THE GPS DATA INSTEAD OF THE PUBLISHED ILS DME.
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.