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Safety Recommendation Details

Safety Recommendation A-83-063
Details
Synopsis: ON JANUARY 3, 1983, N805C, A CANADAIR CHALLENGER CL-600, OWNED AND OPERATED BY THE A.E. STALEY MANUFACTURING COMPANY, INC., DECATUR, ILLINOIS, CRASHED INTO A MOUNTAIN ABOUT 2.2 NMI NORTH OF THE FRIEDMAN MEMORIAL AIRPORT, HAILEY, IDAHO. AT THE TIME, THE AIRPLANE WAS PROCEEDING TO LAND AT THE AIRPORT. THE SAFETY BOARD HAS DETERMINED THAT THE PROBABLE CAUSE OF THE ACCIDENT WAS THE FLIGHTCREW'S FAILURE TO ADHERE TO THE RECOMMENDED VISUAL ARRIVAL PROCEDURES FOR THE SUN VALLEY AIRPORT, AND THEIR FAILURE TO EXECUTE TIMELY TERRAIN AVOIDANCE ACTIONS. THE REASONS FOR THE FLIGHTCREW'S FAILURES COULD NOT BE ESTABLISHED CONCLUSIVELY.
Recommendation: THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: IN CONJUNCTION WITH THE APPROPRIATE CANADIAN AUTHORITIES, CONDUCT A SURVEY OF CANADAIR CL-600 AIRPLANES TO DETERMINE WHETHER THE HYDRAULIC SYSTEMS OF THE AIRPLANES CHARACTERISTICALLY DEVELOP HIGH LEVELS OF RUBBER/TEFLON PARTICLE CONTAMINATION; IF UNACCEPTABLE LEVELS OF CONTAMINATION ARE FOUND, DETERMINE AND CORRECT THE CAUSE OF THE CONTAMINATION, AND REQUIRE THE NECESSARY IMPROVEMENTS IN THE HYDRAULIC FILTRATION SYSTEMS TO PREVENT CONTAMINANTS FROM ENTERING VITAL COMPONENTS, SUCH AS FLIGHT CONTROL ACTUATORS.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Alternate Action
Mode: Aviation
Location: HAILEY, ID, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA83AA010
Accident Reports: A. E. Staley Manufacturing Company, Inc., Canadair Challenger CL-600, N805C
Report #: AAR-83-05
Accident Date: 1/3/1983
Issue Date: 9/12/1983
Date Closed: 5/22/1984
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Alternate Action)
Keyword(s):

Safety Recommendation History
From: NTSB
To: FAA
Date: 5/22/1984
Response: Mr. Helms' letter cites specific information presented to you by the Canadian Department of Transportation indicating that, "The levels of contamination found in the hydraulic actuators are not a cause for concern for proper functioning of the actuators and the airworthiness of the aircraft." Canadair Memorandum MBS-600-229, dated October 13, 1983, states that the maximum particle count contamination levels during the hydraulic system endurance tests (15,000 equivalent flight cycles) was Class 7 to 9. The contamination levels in the accident airplane for all three hydraulic systems were significantly higher--Class 11 to 12. While Mr. Helms' letter did not speak to why the contamination level in the three hydraulic systems of the accident airplane, which had only 203 total flight hours, was so high relative to the endurance tests, it may have been related, at least in part, to improper masking of hydraulic actuator rods before the airplane was painted. Canadair's advisory material on painting precautions should alleviate this condition. In Canadair Memorandum MBS-600-229, it was stated that a program was being prepared in accordance with the CL-600 Reliability and Safety Report to monitor hydraulic power control units for excessive wear or unexpected deterioration in performance and, if found, to investigate any such occurrences. Mr. Helms' letter states that service history does not indicate excessive hydraulic actuator wear or filter replacement caused by contamination. The letter also states that the hydraulic and control system designs minimize the possibility of jams and comply with the requirements of 14 CFR 25.671. Based on this information, the close similarity of the hydraulic power control unit sampling program with the survey recommended by the Safety Board, and the satisfactory results of this program to date, the Safety Board has classified Safety Recommendation A-83-63 as "Closed--Acceptable Alternate Action." Your continued cooperation in solving transportation safety problems is appreciated.

From: FAA
To: NTSB
Date: 12/16/1983
Response: FAA LETTER: "...EFFECTS OF (HYDRAULIC) JAMS ON THE CONTROLLABILITY OF THE AIRCRAFT HAVE BEEEN ASSESSED AN FOUND IN COMPLIANCE WITH THE REQUIREMENTS OF 14 CFR 25.671 ...HYDRAULIC SYSTEM ENDURANCE TESTS (15,000 HOURS) DID NOT INDICATE EXCESSIVE CONTAMINANT ACCUMULATION IN THE RESERVOIRS... REDUNDANCY OF ACTUATORS ON ALL CONTROL SURFACES MINIMIZES THE POSSIBILITY OF JAMS. IF A JAM SHOULD OCCUR, IT IS ANNUNCIATED TO THE PILOT. CANADAIR LTD. HAS ISSUED ADVISORY MATERIAL TO OPERATORS OF THE CANADAIR MODEL CL-600 AIRPLANE INDICATING PRECAUTIONS TO BE TAKEN WHEN PAINTING THE AIRCRAFT."