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B737-500 aircraft on arrival encountered wake turbulence from preceding B747-400 aircraft 8 mi ahead. Reporter captain complains of lack of ATC advisory.
| Attributes | |
| ACN | 385627 |
| Time | |
| Date | 199711 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : smo airport : lax |
| State Reference | CA |
| Altitude | msl bound lower : 10000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : lax |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent other |
| Route In Use | arrival other arrival star : star enroute airway : lax |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : commercial pilot : flight engineer pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 10000 flight time type : 3000 |
| ASRS Report | 385627 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe inflight encounter other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Air Traffic Incident | other |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
On socal TRACON descending on sadde arrival to lax, encountered moderate wake turbulence. Asked controller who we were following -- B747 12 O'clock 8 mi. Received no wake turbulence cautionary advisories per 7110.65 until on tower frequency. Called TRACON. They stated that they 'do not normally' give advisories if more than 6 mi in trail. I told them that we could have injured the flight attendants -- they were up in the aisle at the time of the encounter. The advisories are needed at more than the minimum separation distance.
Original NASA ASRS Text
Title: B737-500 ACFT ON ARR ENCOUNTERED WAKE TURB FROM PRECEDING B747-400 ACFT 8 MI AHEAD. RPTR CAPT COMPLAINS OF LACK OF ATC ADVISORY.
Narrative: ON SOCAL TRACON DSNDING ON SADDE ARR TO LAX, ENCOUNTERED MODERATE WAKE TURB. ASKED CTLR WHO WE WERE FOLLOWING -- B747 12 O'CLOCK 8 MI. RECEIVED NO WAKE TURB CAUTIONARY ADVISORIES PER 7110.65 UNTIL ON TWR FREQ. CALLED TRACON. THEY STATED THAT THEY 'DO NOT NORMALLY' GIVE ADVISORIES IF MORE THAN 6 MI IN TRAIL. I TOLD THEM THAT WE COULD HAVE INJURED THE FLT ATTENDANTS -- THEY WERE UP IN THE AISLE AT THE TIME OF THE ENCOUNTER. THE ADVISORIES ARE NEEDED AT MORE THAN THE MINIMUM SEPARATION DISTANCE.
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.