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Safety Recommendation Details

Safety Recommendation A-71-026
Details
Synopsis: AS A RESULT OF A RECENT INCIDENT INVOLVING A BOEING 747 WHICH ENCOUNTERED SEVERE TURBULENCE, SIX PASSENGERS AND ONE STEWARDESS WERE HOSPITALIZED, AND 15 PASSENGERS AND ONE STEWARDESS WERE TREATED FOR MINOR INJURIES. ALL INJURIES WERE THE RESULT OF THE SEVERE TURBULENCE ENCOUNTERED WHILE CLIMBING THROUGH FLIGHT LEVEL 280 AT AN INDICATED AIR SPEED OF 280 KNOTS.
Recommendation: LOCKING MECHANISMS BE INSPECTED AND EITHER BE REPLACED WITH LOCKS OF A NEW DESIGN OR THE DEFECTIVE LOCK MECHANISMS BE RETURNED TO SERVICEABLE CONDITION BY REWORK OR REPAIR.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Aviation
Location: Nantucket, MA, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: NYC71AN054
Accident Reports: Pan American World Airways, Inc., Boeing 747-121, N739PA
Report #: AAR-72-14
Accident Date: 11/4/1970
Issue Date: 4/7/1971
Date Closed: 5/24/1971
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s):

Safety Recommendation History
From: FAA
To: NTSB
Date: 5/7/1971
Response: A CORRECTIVE RETROFIT MODIFICATION TO THE LOCKING MECHANISM HAS BEENPREPARED BY BOEING IN SERVICE BULLETIN 25-2056. FAA STUDYING NEED FOR MANDATORY ACTION.