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Safety Recommendation Details

Safety Recommendation A-72-077
Details
Synopsis: PRELIMINARY EVIDENCE COLLECTED DURING THE INVESTIGATION OF THE ACCIDENT INVOLVING DELTA AIRLINES, INC., DC-9, N3305L, AT FORT WORTH, TEXAS, ON MAY 30, 1972, SUGGESTS THAT THE VORTEX TURBULENCE GENERATED BY AN AMERICAN AIRLINES, INC., DC-10 MIGHT HAVE BEEN A FACTOR IN THE OCCURRENCE. THE DC-10 HAD JUST COMPLETED A "TOUCH AND GO" LANDING WHILE THE DC-9 WAS ON THE FINAL APPROACH.
Recommendation: ISSUE ALERT NOTICES TO ALL PILOTS AND AIRCRAFT OPERATORS THAT WILL STRESS THE URGENT NEED TO MAINTAIN AN ADEQUATE SEPARATION FROM HEAVY JET AIRCRAFT.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Aviation
Location: Fort Worth, TX, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: 79669
Accident Reports: Delta Air Lines, Inc., McDonnell Douglas DC-9-14, N3305L
Report #: AAR-73-03
Accident Date: 5/30/1972
Issue Date: 6/14/1972
Date Closed: 9/7/1972
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s):

Safety Recommendation History
From: NTSB
To: FAA
Date: 12/1/1973
Response: Closed--Acceptable Action.

From: FAA
To: NTSB
Date: 7/5/1972
Response: ATC PROCEDURES ARE CONSTANTLY BEING REVIEWED FOR ADEQUACY. AIRCRAFT OPERATING BEHIND HEAVY JET AIRCRAFT REQUIRE EITHER FIVE MILES RADAR SEPARATION OR TWO MINUTES LONGITUDINAL SEPARATION. CONTROLLERS ISSUE CAUTIONARY INFORMATION IF IN THEIR OPINION WAKE TURBULENCE WILL HAVEAN ADVERSE EFFECT. PRESENT NONRADAR VFR PROCEDURES PLACE THE PRIMARY RESPONSIBILITY FOR SEPARATION WITH THE PILOT. TWO MINUTES SEPARATIONIS PROVIDED FOR SUCCESSIVE DEPARTURES. UNTIL SUCH TIME AS A METHOD OF DETECTING AND DISPLAYING THE POSITION OF THE VORTICES IS DEVISED,THE RESPONSIBILITY FOR ADEQUATE SEPARATION WILL BE THAT OF THE PILOT. ALL CONTROLLERS HAVE SEEN THE FILM "WAKE TURBULENCE." THEY WILL ALSO BE SHOWN A VIDEO TAPE TO EMPHASIZE THE FACT THAT LARGE AIRCRAFT MAY ALSO BE AFFECTED BY WAKE TURBULENCE.