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Safety Recommendation Details

Safety Recommendation A-80-112
Details
Synopsis: ON FEBRUARY 12, 1979, AN ALLEGHENY AIRLINES NORD 262 CRASHED ON TAKEOFF FROM CLARKSBURG, WEST VIRGINIA. THE ACCIDENT RESULTED IN TWO FATALITIES AND SEVEN SERIOUS INJURIES. AT THE TIME OF TAKEOFF, THERE WERE LIGHT SNOW SHOWERS AT THE AIRPORT WITH AN ESTIMATED ACCUMULATION RATE OF APPROXIMATELY 1 INCH PER HOUR. DEICING OF THE AIRCRAFT, WITH A 78-PERCENT SOLUTION OF AN ETHYLENE GLYCOL-BASED DEICING FLUID AND WATER, WAS COMPLETED 25 TO 40 MINUTES PRIOR TO TAKEOFF. WITNESSES REPORTEDLY SAW SNOW ON THE EXPOSED HORIZONTAL SURFACES OF THE AIRCAFT WHEN IT TAXIED OUT. THE PROBABLE CAUSE OF THE ACCIDENT WAS DETERMINED TO BE, IN PART, THE LOSS OF LATERAL CONTROL AND LIFT DUE TO SNOW ON THE WINGS AND EMPENNAGE WHEN THE AIRCRAFT CLIMBED OUT OF GROUND EFFECT. THE PRESENCE OF FROZEN SNOW ON THE UPPER HORIZONTAL AIRFOIL SURFACES WAS CONFIRMED BY PHOTOGRAPHS AFTER THE ACCIDENT. ON FEBRUARY 18, 1980, A REDCOAT AIR CARGO, LTD., BRISTOL BRITTANIA 253, CRASHED SHORTLY AFTER TAKEOFF FROM LOGAN INTERNATIONAL AIRPORT, BOSTON. THE ACCIDENT RESULTED IN SEVEN DEATHS AND ONE SERIOUS INJURY. LIGHT SNOW HAD FALLEN THROUGHOUT THE PERIOD OF FLIGHT PREPARATION, TAXI, AND TAKEOFF AT A RATE OF BETWEEN 0.5 AND 0.8 INCH PER HOUR. THE AIRCRAFT HAD BEEN DEICED WITH A 30-PERCENT SOLUTION OF AN ETHYLENE GLYCOL-BASED DEICING FLUID 45 TO 60 MINUTES PRIOR TO TAKEOFF. EVIDENCE INDICATES THAT WET SNOW, WHICH ACCUMULATED ON THE WINGS AND HORIZONTAL STABILIZER PRIOR TO TAKEOFF, WAS A MAJOR FACTOR IN THIS ACCIDENT.
Recommendation: THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: ADVISE OPERATORS OF THE POTENTIAL HAZARD OF AN ACCUMULATION OF WET SNOW ON AIRFOIL SURFACES AFTER DEICING WITH A DILUTED ETHYLENE GLYCOL SOLUTION. (URGENT)
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Aviation
Location: Clarksburg, WV, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA80AA011
Accident Reports: Allegheny Airlines, Inc., Nord 262 Mohawk/Frakes 298, N29824
Report #: AAR-81-03
Accident Date: 2/12/1979
Issue Date: 8/16/1979
Date Closed: 7/1/1981
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s): Icing,Weather

Safety Recommendation History
From: NTSB
To: FAA
Date: 7/1/1981
Response: In Safety Recommendation A-80-112 we requested the FAA to advise operators of potential hazard of an accumulation of wet snow on air-foil surfaces after deicing with a diluted ethylene glycol solution. We have examined the FAA's advance copy of Air Carrier Operations Bulletin No.7-81--1 aircraft deicing and anti-icing procedures and find it fully responsive to the recommendation which we now classify in a closed-acceptable action status.

From: FAA
To: NTSB
Date: 5/26/1981
Response: FAA LTR: ENCLOSED WAS AN ADVANCE COPY OF AIR CARRIER OPERATIONS BULLETIN NO. 7-81-1 -- AIRCRAFT DEICING AND ANTI-ICING PROCEDURES.

From: NTSB
To: FAA
Date: 3/30/1981
Response: We are pleased to learn that the FAA is preparing an operations bulletin to emphasize the dangers of snow accumulation on aircraft following deicing. The status of this recommendation is classified as open-acceptable action.

From: FAA
To: NTSB
Date: 2/11/1981
Response: FEDERAL AVIATION ADMINISTRATION LTR: THE FAA CONCURS IN THIS SAFETY RECOMMENDATION AND WE ARE PREPARING AN OPERATIONS BULLETIN TO EMPHASIZE THE DANGERS OF SNOW ACCUMULATION ON AIRCRAFT FOLLOWING DEICING. OPERATORS WILL BE REQUESTED TO REVIEW THEIR DEICING AND ANTI-ICING PROCEDURES IN VIEW OF THESE ACCIDENTS.