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A B777 pilot reports rjaa used the term 'microburst alert' inappropriately because the detection equipment is not installed.
| Attributes | |
| ACN | 668317 |
| Time | |
| Date | 200508 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : rjaa.airport |
| State Reference | FO |
| Altitude | msl single value : 16000 |
| Environment | |
| Weather Elements | Windshear Thunderstorm |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : rjtg.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : holding descent : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : rjtg.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : holding descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : relief pilot |
| Experience | flight time last 90 days : 240 flight time total : 6000 flight time type : 1000 |
| ASRS Report | 668317 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | inflight encounter : weather non adherence : published procedure |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : unable |
| Consequence | other |
| Supplementary | |
| Problem Areas | Weather ATC Human Performance Airport |
| Primary Problem | ATC Human Performance |
Narrative:
During descent to rjaa; the approach controller announced 'microburst alert' for runway 16R with loss of airspeed of 37 KTS. At least 6 aircraft then asked for holding clrncs during which time some aircraft diverted to rjtt (including some air carrier X aircraft). It appears to me that rjaa does not have the proper ground equipment to measure microburst alert. They have no doppler system and thus cannot legally use this term when communicating to other aircraft. This will certainly cause further confusion in the future if they seemingly can use this phrase arbitrarily. Please clarify this for flight crews for future use.
Original NASA ASRS Text
Title: A B777 PLT RPTS RJAA USED THE TERM 'MICROBURST ALERT' INAPPROPRIATELY BECAUSE THE DETECTION EQUIP IS NOT INSTALLED.
Narrative: DURING DSCNT TO RJAA; THE APCH CTLR ANNOUNCED 'MICROBURST ALERT' FOR RWY 16R WITH LOSS OF AIRSPD OF 37 KTS. AT LEAST 6 ACFT THEN ASKED FOR HOLDING CLRNCS DURING WHICH TIME SOME ACFT DIVERTED TO RJTT (INCLUDING SOME ACR X ACFT). IT APPEARS TO ME THAT RJAA DOES NOT HAVE THE PROPER GND EQUIP TO MEASURE MICROBURST ALERT. THEY HAVE NO DOPPLER SYS AND THUS CANNOT LEGALLY USE THIS TERM WHEN COMMUNICATING TO OTHER ACFT. THIS WILL CERTAINLY CAUSE FURTHER CONFUSION IN THE FUTURE IF THEY SEEMINGLY CAN USE THIS PHRASE ARBITRARILY. PLEASE CLARIFY THIS FOR FLT CREWS FOR FUTURE USE.
Data retrieved from NASA's ASRS site as of January 2009 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.