Skip Ribbon Commands
Skip to main content
Safety Recommendation Details

Safety Recommendation A-73-120
Details
Synopsis: INVESTIGATION OF THE PAN AMERICAN WORLD AIRWAYS, INC., BOEING 707 ACCIDENT AT BOSTON, MASSACHUSETTS, ON NOVEMBER 3, 1973, HAS DISCLOSED SOME FINDINGS ABOUT WHICH THE NATIONAL TRANSPORTATION SAFETY BOARD IS CONCERNED.
Recommendation: EFFECT RETROACTIVE MODIFICATIONS ON ALL SUBJECT AIRCRAFT TO ENSURE FULL COMPLIANCE WITH PROVISIONS OF FAR 25.855 AND 25.857 PERTAINING TO PREVENTION OF HAZARDOUS QUANTITIES OF SMOKE, FLAMES, OR NOXIOUS GASES FROM ENTERING THE FLIGHTCREW COMPARTMENT.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Aviation
Location: Boston, MA, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA74AZ016
Accident Reports: Pan American World Airways, Inc., Boeing 707-321C, N458PA
Report #: AAR-74-16
Accident Date: 11/3/1973
Issue Date: 12/28/1973
Date Closed: 2/20/1975
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s): Hazmat

Safety Recommendation History
From: FAA
To: NTSB
Date: 1/11/1974
Response: 1/11/74 RESPONSE FROM THE FAA TO SAY THAT THEY ARE PRESENTLY ASSESSING THE ADEQUACY OF THE CABIN SMOKE EVACUATION PROVISIONS ON THE 707. THIS WILL INVOLVE A REVIEW OF THE DESIGN, PAST TESTING AND THE TESTING PRESENTLY BEING CONDUCTED BY THE MANUFACTURER. BASED UPON THEIR FINDINGS OF THIS ASSESSMENT, THEY WILL, TOGETHER WITH THE MANUFACTURER, DEVELOP ANY NEEDED CORRECTIVE ACTIONS IN CONSONANCE WITH THE BOARD RECOMMENDATIONS. 1/25/74 FURTHER RESPONSE FROM THE FAA STATING THAT DURING THE CERTIFICATION PROGRAM, THE 707-321C CONFIGURATION AND THE ASSOCIATED SMOKE CHUTE INSTALLATION WAS FLIGHT TESTED WITH LARGE QUANTITIES OF SMOKE GENERATED IN THE CLASS E CARGO COMPARTMENT. WHEN SPECIFIED EMERGENCY PROCEDURES WERE FOLLOWED, SMOKE WAS EXCLUDED FROM THE COCKPIT, THUS SHOWING COMPLIANCE WITH THE SMOKE EXCLUSION PROVISIONS OF FAR 25.855 AND 25.857. MEANS ARE PROVIDED TO SHUT OFF THE NORMAL VENTILATING AIRFLOW TO THE CLASS E CARGO COMPARTMENT AS REQUIRED BY FAR 25.857(E)(3). FURTHER VISUAL OBSERVATION DURING THE ABOVE FLIGHT TESTS CONFIRMED THAT THERE WAS NO REVERSE AIRFLOW THROUGH THE SMOKE CHUTE DURING SMOKE EVACUATION TESTS. SEPERATE FLIGHT TESTS WERE PERFORMED TO SHOW COMPLIANCE WITH THE SMOKE DETECTION PROVISIONS OF FAR 25.857. THE FAA IS FURTHER INVESTIGATING THE NEED TO IMPROVE THE EMERGENCY SMOKE EVACUATION PROCEDURES WITH RESPECT TO CLARITY AND OPERATIONAL USE. FURTHER INVESTIGATION WILL DETERMINE WHETHER IMPROVED AIR CARRIER SMOKE EVACUATION PROCEDURES ARE WARRANTED.