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Safety Recommendation Details

Safety Recommendation A-72-153
Details
Synopsis: FLIGHT 366, A BOEING 720B, ON A PROFICIENCY CHECK FLIGHT, YAWED AND ROLLED OUT OF CONTROL, AND CRASHED WHILE IN THE PROCESS OF EXECUTINGA 3-ENGINE MISSED-APPROACH FROM A SIMULATED ENGINE-OUT ILS INSTRUMENT APPROACH. THE FIVE CREW-MEMBERS AND ONLY OCCUPANTS DIED IN THE CRASH. THE WEATHER CONDITIONS AT ONTARIO WERE 600 FEET OVERCAST, WITH 3/4-MILE VISIBILITY IN FOG, HAZE, AND SMOKE. THE NATIONAL TRANSPORTATION SAFETY BOARD DETERMINES THAT THE PROBABLE CAUSE OF THIS ACCIDENT WAS THE FAILURE OF THE AIRCRAFT RUDDER HYDRAULIC ACTUATOR SUPPORT FITTING. THE FAILURE OF THE FITTING RESULTED IN THE INAPPARENT LOSS OF LEFT RUDDER CONTROL WHICH, UNDER THE CONDITIONS OF THIS FLIGHT, PRECLUDED THE PILOT'S ABILITY TO MAINTAIN DIRECTIONAL CONTROL DURING A SIMULATED ENGINE-OUT MISSED- APPROACH. THE EXISTING WEATHER CONDITIONS DEGRADED EXTERNAL VISUAL CUES, THEREBY HAMPERING RAPID ASSESSMENT OF AIRCRAFT PERFORMANCE BY THE FLIGHT CHECK CAPTAIN.
Recommendation: THE FAA REVIEW ALL AIR CARRIER PILOT TRAINING PROGRAMS TO INSURE THAT ADEQUATE INFORMATION IS MADE AVAILABLE TO THE PILOTS ON WHICH TO BASE: (1) A COMPREHENSION OF THE SIDESLIP-ROLL COUPLING EFFECTS IN SWEPTWING AIRCRAFT, AND (2) CONSIDERATIONS FOR THE USE OF THE THRUST REDUCTION METHOD OF SYMMETRIZING THRUST TO OVERCOME DIRECTIONAL CONTROL PROBLEMS.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Unacceptable Action
Mode: Aviation
Location: Ontario, Canada
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA71AZ009
Accident Reports: Western Air Lines, Inc., Boeing 720- 047B, N3166
Report #: AAR-72-18
Accident Date: 3/31/1971
Issue Date: 6/7/1972
Date Closed: 1/16/1973
Addressee(s) and Addressee Status: FAA (Closed - Unacceptable Action)
Keyword(s): Flightcrew, Training and Education

Safety Recommendation History
From: FAA
To: NTSB
Date: 9/26/1972
Response: FAA FIELD PERSONNEL ARE REQUIRED TO CONTINUALLY REVIEW WITH AIR CARRIER TRAINING PERSONNEL, THE CHARACTERISTICS OF THE SWEPTWING TRANSPORT, AND, IN ADDITION, EMPHASIZE THE IMPORTANCE OF OBSERVING PROPER POWER RECOVERY TECHNIQUES AND SAFEGUARDS DURING THE CONDUCT OF TRAINING MANEUVERS.