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Safety Recommendation Details

Safety Recommendation A-86-131
Details
Synopsis: ON DECEMBER 2, 1985, AN EMBRAER EMB-110P1 AIRPLANE EXPERIENCED A FAILURE OF THE LEFT MAIN LANDING GEAR AXLE FITTING, P/N 14331, DURING TAXI FOR DEPARTURE FROM DETROIT METRO/ WAYNE COUNTY AIRPORT, DETROIT, MICHIGAN. THE AIRPLANE LANDING GEAR SYSTEM RECEIVED MINOR DAMAGE AND THE 15 PASSENGERS AND CREWMEMBERS WERE NOT INJURED. METALLURGICAL EXAMINATION OF THE AXLE FITTING AT THE NATIONAL TRANSPORTATION SAFETY BOARD'S MATERIALS LABORATORY REVEALED A FRACTURE BETWEEN THE BRAKE ATTACHMENT FLANGE OF THE AXLE AND THE PISTON TUBE (BODY OF THE FITTING). THERE WERE THREE ZONES OF FATIGUE CRACKING ON THE FRACTURE, ALL OF WHICH HAD INITIATED FROM MULTIPLE SITES WITHIN THE AS-MANUFACTURED RADIUS BETWEEN THE AXLE AND THE BODY OF THE FITTING. THIS MEASURED EFFECTIVE RADIUS ON A SECTION THROUGH THE AXLE WAS APPROXIMATELY 0.06 INCH AT THE POSITION CORRESPONDING TO THE LOCATIONS OF THE FATIGUE INITIATION SITES. THIS VALUE IS FAR BELOW THE MANUFACTURER'S SPECIFIED RADIUS OF 10.0 MM (0.395 INCH).
Recommendation: THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: ISSUE AN AIRWORTHINESS DIRECTIVE TO REQUIRE IMMEDIATE INSPECTIONS OF THE MAIN LANDING GEAR AXLE FITTINGS INSTALLED ON ALL EMB-110 AIRPLANES WITH METHODS ADEQUATE (1) TO DETECT CRACKING IN THE AREA OF THE RADIUS BETWEEN THE AXLE AND MAIN BODY OF THE AXLE FITTING AND (2) TO MEASURE THIS RADIUS. THE AIRWORTHINESS DIRECTIVE SHOULD SPECIFY THAT ANY CRACKED FITTINGS BE REMOVED FROM SERVICE AND THAT ALL FITTINGS WITH UNDERSIZE RADII BE REWORKED TO COMPLY WITH THE MANUFACTURER'S ENGINEERING DRAWING REQUIREMENTS WITHIN A PRESCRIBED TIME INTERVAL.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Aviation
Location: ALPENA, MI, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA86AA021
Accident Reports: Simmons Airlines, Flight 1746, Embraer Bandeirante, EMB-110P1, N1356P
Report #: None
Accident Date: 3/13/1986
Issue Date: 12/19/1986
Date Closed: 3/26/1987
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Action)
Keyword(s):

Safety Recommendation History
From: NTSB
To: FAA
Date: 3/26/1987
Response: The Safety Board has reviewed Airworthiness Directive (AD) Docket No. 86-CE-38-AD; Amendment 39-5524, which requires the inspection of the main landing gear wheel axle support junctions on Embraer Models EMB-110P1 and EMB-110P2 for cracks and the proper fillet radius. The Safety Board finds that this AD complies with the intent of this recommendation. Therefore, Safety Recommendation A-86-131 has been classified as "Closed-Acceptable Action."

From: FAA
To: NTSB
Date: 2/25/1987
Response: THE FAA AGREES WITH THIS RECOMMENDATION. ON JANUARY 15, 1987, THE FAA ISSUED AN AD, (DOCKET NO. 86-CE-38-AD: AMENDMENT 39-5524) WHICH REQUIRES INSPECTIONS OF THE MAIN LANDING GEAR WHEEL AXLE/PISTON TUBE SUPPORT JUNCTION FOR CRACKS AND THE PROPER FILLET RADIUS, AND REPLACEMENT OF REWORK OF THESE PARTS ARE REQUIRED. THIS AD IS APPLICABLE TO EMBRAER MODELS EMB-110P1 AND EMB-110P2 AIRPLANES, AND IS EFFECTIVE MARCH 1, 1987. THIS ACTION WILL DETECT THESE CRACKS AND CAUSE THE WHEEL AXLE/PISTON TUBE ASSEMBLY TO BE REMOVED FROM SERVICE BEFORE FAILURE COULD RESULT IN LOSS OF CONTROL OF THE AIRPLANE.