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Interim Recommendation issued to: Federal Aviation Administration (FAA)

Recommendation details
Output No: IR19990173
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 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.

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.

IR19990174

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".

Initial response
Date issued: 01 November 1999
Response from: Federal Aviation Administration (FAA)
Action status: Monitor
Response text:

The Office of Accident Investigation is in receipt of your recommendation regarding "Beech 1900D Wing Wiring."

Your recommendation has been forwarded to the appropriate office for response, which is normally 90 days. Your recommendation has been identified as 99.371, and inquiries should reference this number.

You will be kept informed as to the progress and final resolution of your submission, If you have any questions, or need additional information regarding this safety recommendation, please notify [name deleted].

Further correspondence
Date issued: 09 March 2000
Response from: Federal Aviation Administration (FAA)
Response status: Closed - Not Accepted
Response text:

This memo is in response to a request for additional information in regards to Safety Recommendation number 99.371.

The Wichita Aircraft Certification Office (ACO) received the following Safety Recommendation on October 1, 1999:

Safety Recommendation 99.371; "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."

The original 1900s and 190OCs (serial numbers beginning with "UA" and "UB" respectively) use a fuel bladder versus a total wet wing in the later 190OCs (serial numbers beginning with 'UC") and 1900D series (serial numbers that begin with "UE"). The specific area of concern for this Safety Recommendation is applicable only to the 'UC" serial numbered 190OCs and 1900D aircraft models because the components involved in this incident are located elsewhere in the Model 1900s and original 190OCs ('UA"s and "UB" s). However, there are some wiring and fuel systems components in this general area in these earlier model aircraft ("UA" and "UB" serial numbers) so the review included them as well.

In the FAA's investigation, which included looking at the incident pictures, reviewing new production 1900D aircraft and reviewing the 1900, 1900C and 1900D Maintenance Manuals, the following items were noted:

a. The incident pictures revealed "tie-wrap" impressions on the plumbing in the area where the arcing is believed to have occurred. This indicates that at one time, the tie-wraps that are used to construct the stand-offs for the electrical wiring were in place.

b. The 1900 and 1900C Maintenance Manual in Section 5-20-02, page 5, (First 200-hour-interval detailed inspection) for item 13.b. states "LEADING EDGE AND NACELLE PLUMBING AND WIRING Zone inspection areas: 511, 521, 522, 531, 541, 611, 621, 622, 631 and 641. Wing panel inspection areas: 54, 55, 56, 57, 58, 59, 60, 61 (UA-1 and after, UB-1 and after); 23, 24, 25, 26, 27, 28 and 29 (UC-1 and after). b. Check the wiring for chafing and security of attachment." In addition, on the same page of the same section for item 14.a states, "PLUMBING Zone inspection areas: 531, 532, 631 and 632. Wing panel inspection areas: 4, 17, 18 (UA- 1 and after, UB- 1 and after); 8, 9, 11, 12, 15, 18, 21, 23, 25, 29 (UC- 1 and after). a. Visually check for leaks, chafing or damage and proper attachment." This inspection is one of six that are to be repeated every 1200 hours per section 5-20-00, page 3 of the same manual.

c. The 1900D Maintenance Manual in Section 5-20-02, page 204, (First 200-hour-interval detailed inspection) for item 9.b. states "LEADING EDGE AND NACELLE PLUMBING AND WIRING Zone inspection areas: 521, 621, 522 and 622. Panel inspection areas: 511, 611, 531AB and 631AB. b. Check the wiring for chafing and security of attachment." In addition, on page 205 of the same section for item 14.a states, "PLUMBING Zone inspection areas: 500, 600, 730 and 740. Panel inspection areas. 531AT and 631A.T. a. Visually check for leaks, chafing or damage and attachment." This inspection is one of six that are to be repeated every 1200 hours per Section 5-20-00, page 204 of the same manual.

d. A FAA representative ran a search on the FAA Service Difficulty Database for "chaffing". What was found were SDR items 162360 and 332583 (there were actually several more, but these were the most relevant). Both of these items appeared to be different (one being in the right outboard nacelle, the other being in the wheel well). The FAA representative did not find any other occurrences of items that resembled this particular scenario.

e. A FAA representative also visually inspected the new Model 1900D aircraft that were coming off of the assembly line. The two production aircraft that were inspected had the electrical wire stand-offs in place, and the FAA representative concluded that these stand-offs provided adequate clearance to the fuel lines.

f. The FAA representative that was investigating this incident was not aware of any instances where the plastic tie wraps that are used for stand-offs have failed (without being cut by something).

The FAA concludes that the Maintenance Manuals already provide for wiring and fuel-line inspection of the Beech 1900, 1900C and 1900D fleet in Wing Zones 531 and 63 1. These wiring and fuel-line inspections are required by the same Maintenance Manuals to be repeated every 1,200 hours. The FAA believes that these inspections are adequate and that no additional Airworthiness Directive action is required. Therefore, we recommend this Safety Recommendation be closed.

 
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Last update 01 April 2011