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Descent below charted minimum altitude as a heavy jet cargo flight starts their descent on the GS for ILS runway 25L while off the localizer due to deviation for thunderstorm activity from 25 NM to 8 NM northeast of vhhh, first officer.
| Attributes | |
| ACN | 559603 |
| Time | |
| Date | 200209 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : vhhh.airport |
| State Reference | FO |
| Altitude | msl bound lower : 3800 msl bound upper : 4300 |
| Environment | |
| Flight Conditions | Mixed |
| Weather Elements | Rain Thunderstorm |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : vhhh.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 25l other |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 30 flight time total : 14000 flight time type : 202 |
| ASRS Report | 559603 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | inflight encounter : weather non adherence : published procedure other anomaly other other spatial deviation other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued advisory flight crew : returned to assigned altitude |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Airport Airspace Structure Chart Or Publication Flight Crew Human Performance Weather |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Approximately 25 mi from runway 25L at hkg, we were cleared for the ILS approach, maintain 4300 ft until established on the localizer. Just prior to localizer intercept, we noticed an area of intense WX approaching the localizer. We intercepted the localizer and requested a 30 degree left turn. The turn was approved and GS intercept occurred. At approximately 3900 ft MSL, the controller informed us that we were south of course and in an area where the minimum altitude was 4300 ft. We immediately returned to 4300 ft. Once clear of the WX, we returned to the localizer and GS and landed without further incident.
Original NASA ASRS Text
Title: DSCNT BELOW CHARTED MINIMUM ALT AS A HVY JET CARGO FLT STARTS THEIR DSCNT ON THE GS FOR ILS RWY 25L WHILE OFF THE LOC DUE TO DEV FOR TSTM ACTIVITY FROM 25 NM TO 8 NM NE OF VHHH, FO.
Narrative: APPROX 25 MI FROM RWY 25L AT HKG, WE WERE CLRED FOR THE ILS APCH, MAINTAIN 4300 FT UNTIL ESTABLISHED ON THE LOC. JUST PRIOR TO LOC INTERCEPT, WE NOTICED AN AREA OF INTENSE WX APCHING THE LOC. WE INTERCEPTED THE LOC AND REQUESTED A 30 DEG L TURN. THE TURN WAS APPROVED AND GS INTERCEPT OCCURRED. AT APPROX 3900 FT MSL, THE CTLR INFORMED US THAT WE WERE S OF COURSE AND IN AN AREA WHERE THE MINIMUM ALT WAS 4300 FT. WE IMMEDIATELY RETURNED TO 4300 FT. ONCE CLR OF THE WX, WE RETURNED TO THE LOC AND GS AND LANDED WITHOUT FURTHER INCIDENT.
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.