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Safety Recommendation Details

Safety Recommendation A-71-031
Details
Synopsis: THE NATIONAL TRANSPORTATION SAFETY BOARD'S INVESTIGATION OF THE APACHE AIRLINES, INC., ACCIDENT NEAR COOLIDGE, ARIZONA, MAY 6, 1971,INVOLVING A CARSTEDT DE HAVILLAND DOVE, MODEL CJ-60, N4922V, HAS REVEALED A FATIGUE FRACTURE WHICH REQUIRES IMMEDIATE CORRECTIVE ACTION. OUR EXAMINATION OF THE RIGHT WING LOWER MAIN SPAR TO FUSELAGE ROOT FITTING P/N CPD2004, WHICH WAS INSTALLED DURING MODIFICATION UNDER STC NO. SA1747WE, REVEALED THE PRESENCE OF A FATIGUE FRACTURE ON ONE SIDE OF THE ATTACHMENT BOLT HOLE. THE FATIGUED REGION WAS IN EXCESS OF 45 PERCENT OF THE TOTAL FRACTURED AREA.
Recommendation: CONDUCT A ONE-TIME METALLURGICAL INSPECTION ON AN EXPEDITED BASIS BY APPROVED METHODS OF ALL LOWER MAIN WING SPAR ROOT FITTINGS P/N CPD2004 ON ALL DE HAVILLAND MODEL DH.104 "DOVE" AIRPLANES THAT HAVE BEEN MODIFIED UNDER STC NO. SA1747WE.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Aviation
Location: Coolidge, AZ, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: LAX71AL066
Accident Reports: Apache Airlines, Inc., DeHavilland DH-104-7AXC, N4922V
Report #: AAR-72-19
Accident Date: 5/6/1971
Issue Date: 5/12/1971
Date Closed: 5/2/1972
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s):

Safety Recommendation History
From: FAA
To: NTSB
Date: 7/14/1971
Response: Pursuant to 14 cfr 435.3 and part 401 of the board's organization regulations, requests for information from the public file of the accident maintained by the board will be entertained, and the material ultimately made available for inspection and copying. In conclusion, we are asking that this airplicant data not be included in the board's public file and thereby not be made available for public inspection and copying.

From: FAA
To: NTSB
Date: 5/27/1971
Response: FAA CONCURRED WITH THE BOARD'S RECOMMENDATIONS AND STATED THAT ADDITIONAL TIME IS NEEDED TO COMPLETE THE ENGINEERING EVALUATION. HOWEVER, ALL CARSTEDT MODIFIED AIRCRAFT ARE BEING INSPECTED FOR NON CONFORMITIES TO TYPE DESIGN AND THEIR AIRWORTHINESS CERTIFICATES HAVE BEEN SUSPENDED PENDING EVIDENCE TO JUSTIFY SAFE FLIGHT. 3/31/72 FURTHER RESPONSE FROM THE FAA TO SAY THAT THEY HAVE APPROVED A MODIFICATION UNDER STC SA2438WE ON 10/22/71 WHICH ADDS TWO FAIL SAFE STEEL STRAPS ACROSS THE LOWER FUSELAGE. A NPRM ISSUED 1/10/72 PROPOSED ON AD TO REPLACE EACH WING LOWER SPAR ATTACH FITTING AND THE LOWER SPAR BOOM AT OR BEFORE EACH 1,800 HOURS TIME IN SERVICE UNLESS STC SA2438WE ACCOMPLISHED.