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Safety Recommendation Details

Safety Recommendation A-72-154
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: ALL MANEUVERS REQUIRING ENGINE(S)-OUT OPERATION OF THE AIRCRAFT CLOSE TO THE GROUND BE CONDUCTED, TO THE MAXIMUM EXTENT POSSIBLE, INAPPROPRIATE FLIGHT SIMULATION DEVICES. FOR THOSE ENGINE(S)-OUT MANEUVERS WHICH THE ADMINISTRATOR DETERMINES MUST BE PERFORMED IN FLIGHT, THE BOARD FURTHER RECOMMENDS THAT CONSIDERATION BE GIVEN TO THEIR PERFORMANCE AT ALTITUDES THAT WILL INSURE AMPLE MARGINS OF SAFETY IN THE EVENT THAT UNEXPECTED AIRCRAFT EMERGENCIES ARE ENCOUNTERED.
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: 11/16/1972
Addressee(s) and Addressee Status: FAA (Closed - Unacceptable Action)
Keyword(s):

Safety Recommendation History
From: FAA
To: NTSB
Date: 9/26/1972
Response: FAR'S PARTS 61 AND 121 PERTAINING TO THE ENGINE(S)-OUT TRAINING MANEUVERS CLOSE TO THE GROUND HAVE BEEN AMENDED. PRESENT REGULATIONS NOW PROVIDE FOR THE MAJORITY OF THE TRAINING MANEUVERS TO BE ACCOMPLISHED IN A SIMULATOR CONSISTENT WITH THE CAPABILITY OF PRESENT AIRCRAFT SIMULATORS. FAA ALSO PLANS REGULATORY ACTION TO PERMIT ADDITIONAL MANEUVERS TO BE ACCOMPLISHED IN THE MORE SOPHISTICATED AIRPLANE SIMULATORS. THE FAA DOES NOT ACCEPT THE BOARD'S RECOMMENDATION THAT ENGINE-OUT TRAINING CHECKS BE CONDUCTED AT HIGH ALTITUDE AS THEY WILL NOT BE REALISTIC.