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Safety Recommendation Details

Safety Recommendation A-73-077
Details
Synopsis: THE NATIONAL TRANSPORTATION SAFETY BOARD'S INITIAL INVESTIGATION INDICATES THAT ONE OR MORE FAULTS IN A BOEING 707-331B LONGITUDINAL CONTROL SYSTEM MIGHT HAVE BEEN CONTRIBUTORY TO THE CAUSE OF A RECENTACCIDENT INVOLVING TRANS WORLD AIRLINES FLIGHT 742, ON AUGUST 28, 1973. ALTHOUGH THE INVESTIGATION HAS NOT YET BEEN COMPLETED, THE SAFETY BOARD BELIEVES THAT THE INITIAL FINDINGS ARE SUFFICIENT TO JUSTIFY CERTAIN INTERIM ACTIONS DESIGNED TO PRECLUDE THE SERIOUS CONSEQUENCES WHICH MAY RESULT FROM SIMILAR OCCURRENCES.
Recommendation: ISSUE AN AIRWORTHINESS DIRECTIVE WHICH WOULD REQUIRE: (A) THAT ALL BOEING 707/720 AIRCRAFT BE SUBJECTED TO AN ELEVATOR BREAKOUT FORCE CHECK IN ACCORDANCE WITH THE APPROVED MAINTENANCE PROCEDURES AT THE NEXT SCHEDULED MAINTENANCE VISIT; AND (B) THAT THOSE AIRCRAFT ON WHICH THE BREAKOUT FRICTION DETERMINED IN PART (A) EXCEEDS THE MAXIMUM ALLOWABLE VALUES BE SUBJECTED TO FURTHER INSPECTION TO ENSURE THAT THE ELEVATOR BALANCE PANEL SEAL COMPRESSION IS NOT EXCESSIVE.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Unacceptable Action
Mode: Aviation
Location: Los Angeles, CA, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: LAX74AL019
Accident Reports: Trans World Airlines, Inc., Boeing 707-331B, N8705T
Report #: AAR-74-08
Accident Date: 8/28/1973
Issue Date: 10/5/1973
Date Closed: 12/7/1973
Addressee(s) and Addressee Status: FAA (Closed - Unacceptable Action)
Keyword(s):

Safety Recommendation History
From: NTSB
To: FAA
Date: 12/7/1973
Response: Closed--unacceptable action.

From: FAA
To: NTSB
Date: 11/2/1973
Response: FAA ENGINEERING PERSONNEL ARE WORKING WITH THE BOEING COMPANY TO ASSESS THE CHARACTERISTICS OF THE PLANE WHEN THE TEST PROGRAM IS COMPLETED AND THE DATA ASSESSED, THEY WILL TAKE APPROPRIATE ACTION. FAA DOES NOT BELIEVE AN AD IS APPROPRIATE AT THIS TIME.