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Safety Recommendation Details

Safety Recommendation A-85-003
Details
Synopsis: ON DECEMBER 6, 1984, A PROVINCETOWN-BOSTON AIRLINES, INC., EMBRAER BANDEIRANTE (EMB-110), N96PB, OPERATING AS FLIGHT 1039, CRASHED SHORTLY AFTER TAKEOFF FROM THE JACKSONVILLE INTERNATIONAL AIRPORT, JACKSONVILLE, FLORIDA. ALL 13 PERSONS ON BOARD WERE KILLED, AND THE AIRPLANE WAS DESTROYED. THE NATIONAL TRANSPORTATION SAFETY BOARD'S CONTINUING INVESTIGATION HAS DISCLOSED THAT THE AIRPLANE'S ELEVATORS AND HORIZONTAL STABILIZER SEPARATED IN FLIGHT, RENDERING THE AIRPLANE UNCONTROLLABLE. EVIDENCE TO DATE INDICATES THAT THE HORIZONTAL STABILIZER SEPARATED FROM THE FUSELAGE AT BULKHEAD 33 ALONG THE TOP RIGHTHAND CORNER OF THE STABILIZER ATTACHMENT FITTING. THIS AREA OF THE BULKHEAD IS SUPPORTED BY C-SHAPED, P/N 4A-1411-08, AND U-SHAPED, P/N 4A-1411-07-17, CHANNELS WHICH ARE RIVETED TOGETHER. THE FUNCTION OF THESE CHANNELS APPEARS TO BE TO TRANSFER THE AFT AND DOWNWARD LOADS ON THE FORWARD ATTACHMENT POINTS OF THE STABILIZER TO THE MONOCOQUE STRUCTURE THROUGH LONGERONS AND THE OUTER FUSELAGE SKIN.
Recommendation: THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: CONDUCT A DIRECTED SAFETY INVESTIGATION OF EMB-110P1 AND -110P2 MODEL AIRPLANES THAT HAVE BEEN MODIFIED IN ACCORDANCE WITH THE PROVISIONS OF AD 83-14-09, (AMENDMENT 39-4527, PARAGRAPH (D) OR (E)), TO DETERMINE WHETHER ANY STRUCTURAL DAMAGE HAS BEEN INFLICTED IN THE AREA WHERE THE HORIZONTAL STABILIZER ATTACHES TO BULKHEAD 33 AND TAKE THE CORRECTIVE ACTION INDICATED BY THE RESULTS OF THE DIRECTED SAFETY INVESTIGATION. (URGENT)
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Alternate Action
Mode: Aviation
Location: JACKSONVILLE, FL, United States
Is Reiterated: No
Is Hazmat: No
Is NPRM: No
Accident #: DCA85AA004
Accident Reports: Provincetown-Boston Airlines Flight 1039, Embraer Bandeirante, EMB-110P1, N96PB
Report #: AAR-86-04
Accident Date: 12/6/1984
Issue Date: 1/8/1985
Date Closed: 12/6/1984
Addressee(s) and Addressee Status: FAA (Closed - Acceptable Alternate Action)
Keyword(s):

Safety Recommendation History
From: FAA
To: NTSB
Date: 8/3/1987
Response:

From: NTSB
To: FAA
Date: 6/24/1986
Response: Safety Recommendation A-85-3 was classified as "Closed--Acceptable Alternate Action," due to the fact that the discrepancies created by accomplishing the modification in accordance with paragraphs (d) and (e) of AD 83-14-09, which was issued August 9, 1983, were limited to a single operator; no discrepancies were noted by FAA inspectors; and all Embraer operators were apprised of the possibility of inflicting damage while modifying the area between bulkheads Nos. 32 and 33.

From: FAA
To: NTSB
Date: 5/20/1985
Response: FAA LTR: "THE FAA AGREES WITH THE INTENT OF SAFETY RECOMMENDATION A-85-03. WE BELIEVE THAT THE DISCREPANCIES CREATED BY ACCOMPLISHING THE MODIFICATION IN ACCORDANCE WITH (D) AND (E) OF AD 83-14-09 AND REPORTED TO THE BOARD ARE LIMITED TO A SINGLE OPERATOR. THE DISCREPANCIES THAT WERE NOTED HAVE BEEN REVIEWED IN LIGHT OF EMBRAER TESTS AND ARE NOT CONSIDERED SIGNIFICANT. OTHER EMBRAER OPERATORS WHO HAVE PERFORMED THE MODIFICATION HAVE NOT INDICATED ANY PROBLEMS IN PERFORMING THE MODIFICATION. SINCE A COPY OF NTSB RECOMMENDATIONS A-85-01 THROUGH A-85-04 HAS BEEN MADE AVAILABLE TO OPERATORS OF EMB-110 AIRPLANES, OPERATORS WHO HAVE NOT MODIFIED THE AREA BETWEEN BULKHEAD 32 AND 33 HAVE BEEN MADE FURTHER AWARE OF THE CONCERN FOR POTENTIALLY INFLICTING DAMAGE WHILE PERFORMING THIS MODIFICATION. A NUMBER OF MODIFIED AIRPLANES HAVE BEEN INSPECTED BY OUR PRINCIPAL (AIRWORTHINESS) INSPECTORS WITH NO REPORTED DISCREPANCIES. WE BELIEVE THAT THE INTENT OF RECOMMENDATION A-85-03 HAS BEEN MET WITHOUT CONDUCTING A FORMAL DIRECTED SAFETY INVESTIGATION AND THAT FURTHER INSPECTION OF THIS AREA IS UNNECESSARY."

From: FAA
To: NTSB
Date: 1/11/1985
Response: FAA LTR: RECOMMENDATIONS A-85-2 AND -3 ARE BEING GIVEN PRIORITY CONSIDERATION BY THE FAA WORKING JOINTLY WITH THE CTA. AS INDICATED BY THE CTA'S JANUARY 9 MESSAGE TO FAA, ADDITIONAL STRUCTURAL TESTS ARE UNDERWAY AT EMBRAER, UNDER CTA SURVEILLANCE, THAT WILL ANSWER THE OPEN QUESTIONS CONCERNING THE RESIDUAL STRENGTH OF THE EXISTING HORIZONTAL TAIL TO FUSELAGE ATTACHMENT AREA WITH SIGNIFICANT INDUCED FAILURES. IN A FEW DAYS WE EXPECT THE RESULTS OF THESE TESTS, WHICH WILL HAVE A SIGNIFICANT BEARING ON OUR RESPONSE TO RECOMMENDATIONS A-85-2 AND -3. WE WILL KEEP THE BOARD ADVISED AS THE ADDITIONAL DATA IS RECEIVED. AREA BETWEEN BULKHEAD 32 AND 33 HAVE BEEN MADE FURTHER AWARE OF THE CONCERN FOR POTENTIALLY INFLICTING DAMAGE WHILE PER FORMING THIS MODIFICATION. A NUMBER OF MODIFIED AIRPLANES HAVE BEEN INSPECTED BY OUR PRINCIPAL AIRWORTHINESS INSPEC TORS WITH NO REPORTED DISCREPANCIES. WE BELIEVE THAT THE INTENT OF THIS RECOMMENDATION HAS BEEN MET WITHOUT CONDUCT ING A FORMAL DIRECTED SAFETY RECOMMENDATION AND THAT FURTHER INSPECTION OF THIS AREA IS UNNECESSARY.