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Safety Recommendation Details

Safety Recommendation A-74-090
Details
Synopsis: ON JULY 8, 1974, A NATIONAL AIRLINES, INC., DC-10, N60NA, WAS INVOLVED IN AN ACCIDENT NEAR TAMPA, FLORIDA. THE NATIONAL TRANSPORTATION SAFETY BOARD'S INVESTIGATION OF THE ACCIDENT HAS REVEALED A NEED FOR CORRECTIVE ACTION ON THE DIGITAL FLIGHT DATA RECORDER (DFDR) SYSTEM. THE AFT COWLING ON THE NO. 1 ENGINE SEPARATED IN FLIGHT AND PART OF IT WAS INGESTED BY THE NO. 2 ENGINE.HEAVY ENGINE DAMAGE, VIBRATION, AND FIRE RESULTED.
Recommendation: MODIFY THE PERIODIC MAINTENANCE CHECK PROCEDURES FOR ALL DIGITAL FLIGHT DATA RECORDING SYSTEMS WHICH USE LOCKHEED AIRCRAFT SERVICE COMPANY RECORDERS, AS FOLLOWS: A. REVISE THE MAINTENANCE CHECK INTERVALS SO THAT THEY ARE COMMENSURATE WITH EACH OPERATOR'S MEAN-TIME-BETWEEN-FAILURE RATE, BUT DO NOT EXCEED 3,000 HOURS. B. REQUIRE AT EACH PRESCRIBED MAINTENANCE CHECK A READOUT OF ACTUAL FLIGHT DATA FOR ALL PARAMETERS EITHER BY COMPUTER OR BY ANALOG METHODS FOR PROPER RECORDER PERFORMANCE. C. REQUIRE THAT THE TAPE HEADS IN THE RECORDERS BE CLEANED EVERY 2,000 HOURS OR AT EVERY MAINTENANCE CHECK PERIOD, WHICHEVER IS LATER(NOT TO EXCEED 3,000 HOURS). D. REQUIRE MAINTENANCE CHECKS EVERY 500 HOURS ON DFDR SYSTEMS WHENEVER A MAJOR MODIFICATION IS MADE AS A RESULT OF SERVICE DIFFICULTIES UNTIL A LONGER CHECK PERIOD CAN BE JUSTIFIED BY THE OPERATOR'S NEW MEAN-TIME-BETWEEN-FAILURE RATE FOR THE SYSTEM.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Aviation
Location: Tampa, FL, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: MIA75AM002
Accident Reports: National Airlines, Inc., McDonnell Douglas DC-10-10, N60NA
Report #: AAS-75-01
Accident Date: 7/8/1974
Issue Date: 11/1/1974
Date Closed: 10/1/1975
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s):

Safety Recommendation History
From: NTSB
To: FAA
Date: 10/1/1975
Response: Closed--acceptable action.

From: FAA
To: NTSB
Date: 11/7/1974
Response: RESPONSE FROM FAA STATING THAT THEY ARE PROCESSING AN AIRWORTHINESS DIRECTIVE WHICH WILL BE IN ACCORDANCE WITH THE RECOMMENDATIONS AND WILL REPLY FURTHER WHEN IT IS COMPLETED.(B)RESPONSE DATED 5/9/75 "WE AGREE WITH THE INTENT OF RECOMMENDATION A-74-90, HOWEVER, WE DO NOT BELIEVE THAT A SPECIFIED INSPECTION PERIOD APPLICABLE ONLY TO THE LOCKHEED RECORDER CAN BEST ACHIEVE OUR COMMON OBJECTIVE. ACCORDINGLY WE HAVE RELEASED FAA NOTICE 8320.178 WHICH REQUIRES OUR FIELD PERSONNEL TO REVIEW RECORDINGS APPLYING THE STANDARDS SPECIFIED IN FAR 121, APPENDIX B. BASED ON THE RESULTS OF SUCH REVIEWS, OUR PERSONNEL ARE INSTRUCTED TO REVISE THE INSPECTION FREQUENCY COMMENSURATE WITH FLIGHT RECORDER PERFORMANCE."