Skip Ribbon Commands
Skip to main content
Safety Recommendation Details

Safety Recommendation A-91-123
Details
Synopsis: ABOUT 0019, SUNDAY FEBRUARY 17, 1991, RYAN INTERNATIONAL AIRLINES FLIGHT 590 (RYAN 590), A DC-9-15, CRASHED WHILE TAKING OFF FROM CLEVELAND-HOPKINS INTERNATIONAL AIRPORT (CLE). THE FLIGHTCREW CONSISTED OF TWO PILOTS. THERE WERE NO OTHER CREWMEMBERS OR PASSENGERS ON THE FLIGHT, WHICH WAS CONTRACTED TO CARRY MAIL FOR THE U.S. POSTAL SERVICE. BOTH PILOTS WERE FATALLY INJURED, AND THE AIRPLANE WAS DESTROYED AS A RESULT OF THE ACCIDENT. BETWEEN 1968 AND 1987, THERE WERE FOUR ACCIDENTS INVOLVING DC-9 SERIES 10 AIRPLANES IN WHICH THERE WAS A LOSS OF CONTROL SHORTLY AFTER TAKEOFF. IN ALL CASES, THE INVESTIGATION SHOWED THAT THE AIRPLANES ACCELERATED NORMALLY AND REACHED AIRSPEEDS AT WHICH THEY SHOULD HAVE BEEN CAPABLE OF ESTABLISHING AND SUSTAINING A SAFE CLIMB. INSTEAD, ALL WERE OBSERVED TO ENTER STEEP ROLL ATTITUDES AND DESCEND TO THE GROUND. ALSO, IN ALL OF THESE ACCIDENTS, WITNESSES REPORTED, AND THE SOUNDS ON THE COCKPIT VOICE RECORDERS (CVRS) CONFIRMED, THAT ENGINE COMPRESSOR SURGES OCCURRED AS THE AIRPLANES DESCENDED.
Recommendation: THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: REQUIRE THE INCLUSION IN THE DC-9 SERIES 10 APPROVED AIRPLANE FLIGHT MANUAL OF A CAUTION ABOUT THE SUSCEPTIBILITY OF THE AIRPLANE TO FLIGHT CONTROL PROBLEMS WITH MINUTE AND MARGINALLY DETECTABLE AMOUNTS OF ICE ON THE LEADING EDGE AND UPPER SURFACE OF THE WING.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Aviation
Location: CLEVELAND, OH, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA91MA021
Accident Reports: Ryan intl Airlines DC-9-15, N565PC Loss of Control on Takeoff
Report #: AAR-91-09
Accident Date: 2/17/1991
Issue Date: 12/11/1991
Date Closed: 6/25/1992
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s): Icing, Weather

Safety Recommendation History
From: NTSB
To: FAA
Date: 6/25/1992
Response: The Safety Board is pleased to note that on January 3, 1992, the FAA issued Airworthiness Directive (AD) 92-03-01 (Docket No. 92-NM-01-AD) fulfilling the intent of Safety Recommendation A-91-123, which is now classified as intent of Safety Recommendation A-91-123, which is now classified as "Closed--Acceptable Action."

From: FAA
To: NTSB
Date: 2/27/1992
Response: THE FAA ISSUED AD 92-03-01 ON JANUARY, 1992, APPLICABLE TO DC-9-10 SERIES AIRPLANES. THE AD REQUIRES THE INCLUSION OF A CAUTIONARY NOTE IN THE AIPLANE FLIGHT MANUAL WHICH SPECIFIES THAT WINGS WITHOUT LEADING EDGE DEVICES ARE PARTICULARLY SUSCEPTIBLE TO LOSS OF LIFT DUE TO WING ICING. MINUTE AMOUNTS OF ICE OR OTHER CONTAMINATION ON THE LEADING EDGE OR WING UPPER SURFACES CAN CAUSE A SUFFICIENT REDUCTION IN THE STALL ANGLE-OF-ATTACK. THE CAUTIONARY NOTE ALSO SPECIFIES THAT THE INCREASED STALL SPEED CAN BE WELL ABOVE THE STALL WARNING (STICK SHAKER) ACTIVATION SPEED.