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Interim Recommendation issued to: Raytheon Aircraft

Recommendation details
Output No: IR19990174
Date issued: 21 September 1999
Safety action status:
Background: Why this Interim Recommendation was developed

Output text

The Bureau of Air Safety Investigation recommends that Raytheon Aircraft alert all operators to initiate an immediate wiring and fuel-line inspection of the Beech 1900 fleet in Wing Zones 531 and 631 as a matter of the highest priority.

As a result of the investigation into this safety deficiency, the Bureau simultaneously issues the following interim recommendations:

"IR19990172

The Bureau of Air Safety Investigation recommends that the Civil Aviation Safety Authority alert all operators to initiate an immediate wiring and fuel-line inspection of the Beech 1900 fleet in Wing Zones 531 and 631 as a matter of the highest priority.

IR19990173

The Bureau of Air Safety Investigation recommends that the Federal Aviation Administration alert all operators to initiate an immediate wiring and fuel-line inspection of the Beech 1900 fleet in Wing Zones 531 and 631 as a matter of the highest priority".

Initial response
Date issued: 18 November 1999
Response from: Raytheon Aircraft
Action status: Closed - Accepted
Response text:

The attached Safety Communique' No. 164 and Temporary Revision No. 26-1 to the Beech 1900D Airliner Maintenance Manual, P/N 129-590000-15, are for your information.

October 1999

ALL BEECH MODEL 1900 SERIES OPERATORS, CHIEF PILOTS, DIRECTORS OF OPERATIONS, DIRECTORS OF MAINTENANCE, AND ALL RAYTHEON AIRCRAFT AUTHORIZED SERVICE CENTERS, AND INTERNATIONAL DISTRIBUTORS AND DEALERS

MODELS: BEECH 1900, SERIALS UA-2 AND UA-3; 1900C, SERIALS UB-1 THROUGH
UB-74, AND UC-1 THROUGH UC-174; 1900C (C-12J), SERIALS UD-1
THROUGH UD-6; AND 1900D), SERIALS UE-1 THROUGH UE-384.

SUBJECT: FIRE CAUSED BY ELECTRIC WIRE CHAFING FUEL LINE AND FIRE EXTINGUISHER TEST

A report has been received of a fire that occurred in the right main wheel well and adjacent outboard wing leading edge area of a Beech 19000 airliner. The event occurred when the aircraft was taxiing to the terminal following a night landing. The fire was quickly extinguished by ground personnel. No injuries were incurred by the flight crew or the passengers.

The fire originated in the equipment bay of the right wing leading edge, just aft of the landing light (MS. 124.20, F.S. 280.50). The fire spread into the wheel well area before it could be extinguished by ground personnel.

The fire was detected by the crew when the master caution annunciator illuminated, followed by the right AC buss "fail' and the right fuel 'pressure low' annunciators. The crew then observed smoke and flames coming from the right nacelle area at which time the appropriate emergency procedures were initiated. It was later determined that the right engine fire extinguisher system did not function when activated.

Heat and fire related damage was confined to the right main landing gear wheel well area, and some slight damage to the wing equipment bay.

The cause of the fire has been determined to be electrical arcing from an unsecured landing light chafed power wire contacting the transfer systern fuel line located behind the landing light. Chafing damage of the wire insulation resulted in wire strands being exposed, thus allowing for electrical arcing to the fuel transfer line causing a fuel leak that then ignited.

Raytheon Aircraft Company is issuing this Safety Communique in order to urge all operators of affected 1900 series airplanes to inspect wiring in the left and right wing equipment bays for signs of distress or damage. Any damaged wiring is to be replaced or repaired. All wiring is to be routed and secured in such a manner as to prevent contact or chafing on any fuel lines, pneumatic lines, equipment and/or structure per best shop practice to maintain no less than 1/4 inch positive separation. The equipment bays may be accessed by removal of wing access panels No. 631 AT, 631 AB, 531 AT, and 531 AB.

The cause of the right engine fire extinguisher not functioning may be due to either a lack of electrical continuity through fire extinguisher "Push To Extinguish" switch or the "Firewall Fuel Valve" control "T" handle. Investigation is ongoing.

Within the next week, Raytheon Aircraft Company will be issuing temporary revisions to CHAPTER 5 -TIME LUTS/MAINTENANCE CHECKS and CHAPTER 26 - FIRE PROTECTION of the appropriate Maintenance Manuals which will establish a required periodic testing of the left and right fire extinguisher circuits. Although this requirement will be added to the appropriate detail inspection, Raytheon Aircraft Company recommends a check be conducted of the fire extinguisher circuit at the next scheduled inspection after receipt of these temporary revisions. This inspection should be conducted as soon as possible, but no later than the next detail inspection on all effected aircraft over 1000 flight hours total time in service.

 
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Last update 01 April 2011