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Safety Recommendation Details

Safety Recommendation A-81-112
Details
Synopsis: ON JUNE 19, 1980, A MCDONNELL DOUGLAS DC-9-80, N1002G, SKIDDED OFF THE RIGHT SIDE OF RUNWAY 21R WHILE ATTEMPTING A SIMULATED HYDRAULIC SYSTEMS INOPERATIVE LANDING AT THE YUMA INTERNATIONAL AIRPORT, YUMA, ARIZONA. THE AIRCRAFT CAME TO REST ABOUT 6,700 FEET BEYOND THE LANDING THRESHOLD OF THE RUNWAY. THE AIRCRAFT WAS DAMAGED SUBSTANTIALLY; HOWEVER, THE THREE FLIGHTCREW MEMBERS WERE NOT INJURED. THERE WERE NO PASSENGERS. THE PURPOSE OF THE FLIGHT WAS TO DEMONSTRATE THAT THE AIRCRAFT COULD BE FLOWN AND LANDED SAFELY WITH A COMPLETE FAILURE OF ITS HYDRAULIC SYSTEMS TO DEMONSTRATE COMPLIANCE WITH A SPECIAL CONDITION TO THE PROVISIONS OF 14 CFR 25. (FOR MORE INFORMATION READ NTSB-AAR-81-16.)
Recommendation: THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: REVISE CERTIFICATION REQUIREMENTS FOR THOSE AIRCRAFT FOR WHICH SAFE FLIGHT AND LANDING FOLLOWING A PARTIAL OR TOTAL HYDRAULIC SYSTEM FAILURE MUST BE DEMONSTRATED TO: (A) INCLUDE A QUANTIFIED LEVEL OF DIRECTIONAL CONTROL FOLLOWING TOUCHDOWN IN TERMS OF YAWING MOMENT OR YAW ACCELERATION FOR APPROPRIATE ROLL OUT SPEEDS; (B) REQUIRE THAT THE APPLICANT DEMONSTRATE THAT THESE VALUES CAN BE OBTAINED USING THOSE CONTROLS WHICH ARE AVAILABLE AND USING THE PROCEDURES WHICH ARE TO BE SPECIFIED FOR THIS CONDITION IN THE AIRCRAFT'S APPROVED FLIGHT MANUAL; AND (C) DEMONSTRATE OR CALCULATE LANDING DISTANCES FOR THIS SPECIAL CONDITION AND INCLUDE THEM IN THE AIRCRAFT'S FLIGHT MANUAL.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Unacceptable Action
Mode: Aviation
Location: Yuma, AZ, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: LAX80FA111
Accident Reports: McDonnell Douglas Corporation, DC-9-80, N1002G
Report #: AAR-81-16
Accident Date: 6/19/1980
Issue Date: 9/15/1981
Date Closed: 5/12/1983
Addressee(s) and Addressee Status: FAA (Closed - Unacceptable Action)
Keyword(s):

Safety Recommendation History
From: NTSB
To: FAA
Date: 5/12/1983
Response: The Board is disappointed in the FAA's conclusion not to revise certification requirements to include a quantified level of directional control in terms of yawing moment or yaw acceleration following touchdown or to require the application to demonstrate that these values can be obtained using the controls and procedures which are available. Therefore, we have classified A-81-112 as "Closed-- Unacceptable Action." The Safety Board will continue to monitor this area of concern.

From: FAA
To: NTSB
Date: 7/12/1982
Response: FAA LETTER: WE DO NOT AGREE WITH PARTS (A) AND (B) OF THIS RECOMMENDATION. THE ONLY SUCCESSFUL CONCLUSION TO THIS TYPE CERTIFICATION REQUIREMENT IS THAT THE PILOT HAVE THE ABILITY CONTROL THE AIRCRAFT DURING FLIGHT AND LANDING WITH A COMPLETE FAILURE OF THE HYDRAULIC SYSTEM. WE FIND THIS DIFFICULT TO QUANTIFY SINCE IT IS LARGELY A FUNCTION OF SKILL OF A PROPER TRAINED PILOT USING PROPER PROCEDURES. WE AGREE WITH PART ( THIS RECOMMENDATION TO THE EXTENT THAT A LANDING DISTANCE COULD BE HELPFUL TO THE PILOT UNDER THE GIVEN CIRCUMSTANCES. TO THAT END, WE HAVE ADDED A NOMINAL WEIGHT, SEAL LEVEL, DRY RUNWAY LANDING DISTANCE TO THE DC-9 SERIES AFM'S. IT IS AN AID ONLY SINCE THE CREW WOULD ALSO NEED TO WEIGH SUCH FACTORS AS FLAP CONFIGURATION, WEIGHT, WEATHER CONDITIONS, ETC. AS WITH OTHER EMERGENCIES AND ABNORMAL SITUATIONS, WE CONTINUE TO STRESS APPROPRIATE TRAINING WITH ADEQUATE PROCEDURES AND PRECAUTION THE AFM'S.

From: NTSB
To: FAA
Date: 7/8/1982
Response: Your reply indicated that an in-depth evaluation of these recommendations would be conducted at meetings between FAA and aircraft manufacturer representatives; therefore, these recommendations have been classified as "Open--Acceptable Action," pending receipt of your findings.

From: FAA
To: NTSB
Date: 12/30/1981
Response: FAA LTR: THE FAA CONCURS IN THE INTENT OF THIS RECOMMENDATION AND AGREES THAT FURTHER STUDY AS RECOMMENDED IN A-81-104, 107, 110, AND 112 IS DESIRABLE. HOWEVER, A MEANINGFUL RESPONSE TO THESE RECOMMENDATIONS AT THIS TIME WOULD BE PREMATURE. MEETINGS ARE SCHEDULED IN THE NEAR FUTURE BETWEEN FAA AND MCDONNELL DOUGLAS REPRESENTATIVES TO CONDUCT AN IN-DEPTH EVALUATION OF EACH RECOMMENDATION. ESTIMATED COMPLETION DATE OF THESE DISCUSSIONS IS EARLY JANUARY 1982. AT THE CONCLUSION OF THESE EVALUATIONS, THE BOARD WILL BE INFORMED OF OUR FINDINGS.