Skip Ribbon Commands
Skip to main content
Safety Recommendation Details

Safety Recommendation A-71-022
Details
Synopsis: THE NATIONAL TRANSPORTATION SAFETY BOARD IS PRESENTLY INVESTIGATING THE WESTERN AIR LINES BOEING 720B TRAINING ACCIDENT WHICH OCCURRED DURING A "HIGH DRAG" APPROACH WITH A SIMULATED INOPERATIVE ENGINE ATTHE ONTARIO INTERNATIONAL AIRPORT, ONTARIO, CALIFORNIA, MARCH 31, 1971.
Recommendation: THE FEDERAL AVIATION ADMINISTRATION REEVALUATE THE MANDATORY INSPECTION TIME PERIODS AND PROCEDURES REQUIRED IN AIRWORTHINESS DIRECTIVE 69-13-2 AND AMENDMENT 39-1174 AND MAKE MODIFICATIONS AS DEEMED NECESSARY TO ASSURE AN ADEQUATE LEVEL OF SAFETY.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Aviation
Location: Ontario, Canada
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA71AZ009
Accident Reports: Western Air Lines, Inc., Boeing 720- 047B, N3166
Report #: AAR-72-18
Accident Date: 3/31/1971
Issue Date: 4/9/1971
Date Closed: 5/17/1971
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s):

Safety Recommendation History
From: FAA
To: NTSB
Date: 4/30/1971
Response: THE FAA STATED THEY ARE IN THE PROCESS OF FURTHER AMENDING THE AD TO REDUCE THE INITIAL AND REPETITIVE INSPECTION TIME INTERVALS AND TO SPECIFY REVISED INSPECTION PROCEDURES AS FOLLOWS: A. COMPLIANCE WITH INITIAL INSPECTION TO BE DONE USING ULTRASONIC TECHNIQUES REDUCED FROM 600 HOURS TO 100 HOURS. B. WITHIN 1,200 HOURS, THE BUSHINGS BE REMOVED, THE INTERNAL BORE OF THE FITTING INSPECTED USING EDDY CURRENT TECHNIQUE, AND THE FITTING COMPREHENSIBLY PROTECTED AGAINST CORROSION IN THE REINSTALLATION OF THE BUSHING. C. TO CONTINUE WITH EITHER ULTRASONIC INSPECTIONS EACH 650 HOURS OR EDDY CURRENT INSPECTION, WITH THE BUSHING REMOVED, EACH 1,200 HOURS.D. THAT AT NOT LATER THAN 5,400 HOURS OR OCT. 1, 1972, FITTINGS BE REPLACED WITH 7075-T73 MATERIAL OR A NEW STEEL DESIGN FITTING. E. THAT DYE PENETRANT INSPECTIONS HAVE BEEN DELETED FROM THE INSPECTION PROCEDURES.