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Interim Recommendation issued to: Beech Aircraft Corp

Recommendation details
Output No: IR19990088
Date issued: 28 July 1999
Safety action status:
Background: Why this Interim Recommendation was developed

Output text

The Bureau of Air Safety Investigation recommends that Raytheon Aircraft issue a directive for an immediate check of the fitment of passenger oxygen system mask container doors on all Beech King Air B200 aircraft and, all other Raytheon aircraft similarly equipped.

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

IR19990084

The Bureau of Air Safety Investigation recommends that the Civil Aviation Safety Authority issue a directive for an immediate check of the fitment of passenger oxygen system mask container doors on all Australian Beech King Air B200 series aircraft, and all other aircraft similarly equipped.

IR19990089

The Bureau of Air Safety Investigation recommends that the Federal Aviation Administration issue a directive for an immediate check of the fitment of passenger oxygen system mask container doors on all Beech King Air B200 series aircraft, and all other aircraft similarly equipped.

IR 19990090

The Bureau of Air Safety Investigation recommends that Raytheon Aircraft examine and implement methods of preventing incorrect passenger oxygen system mask container door fitment as installed in Beech King Air B200 series aircraft, and all other Raytheon aircraft similarly equipped.

Initial response
Date issued: 11 January 2000
Response from: Beech Aircraft Corp
Action status: Closed - Accepted
Response text:

RAC has published King Air Series Communique 99-005, dated October 1999 (copy enclosed). RAC also published Safety Communique No. 168 (copy enclosed), dated November 1999 and applicable to all Raytheon Aircraft models with deployable passenger oxygen mask systems, to ensure that all operators are aware of the importance of properly installing the doors on the oxygen mask boxes.

ATSB Note: Extracts from the relevant communiques are published below for clarification:

RAC Safety Communique No 168:

November 1999

TO: All Operators, Chief Pilots, Directors of Operations, Directors of Maintenance, Raytheon Aviation Centers, Raytheon Aircraft Authorized Service Centers, and International Distributors and Dealers

MODELS: All Raytheon Aircraft Models with Deployable Passenger Oxygen Mask Systems

SUBJECT: Passenger Oxygen Mask Stowage

Raytheon Aircraft Company (RAC) feels it necessary to stress the importance of properly packing and stowing the Passenger Oxygen Masks. A recent incident necessitates reminding operators/mechanics of the maintenance practices involving this safety equipment.

RAC has received a report from Australian CAA Authorities that some of the passenger oxygen masks installed in a King Air Model 200 did not deploy during a non-pressurized flight above 12,500 feet. Further investigation found the auto-deployment system functioned correctly; however, the oxygen mask container door had not been reinstalled correctly. If the door is installed 180 (degrees) from the correct position, the door open plunger cannot strike the block mounted on the door. This will prevent the door from opening. There are caution statements in the Model 200 Maintenance Manual, Chapter 35~ pages 215 and 216, which state, "Container door can be positioned 180 degrees off. If this happens, the plunger cannot push the door open when activated," and other instructions that describe the proper way to repack the masks and reinstall the door. The Phase 1 and Phase 3 inspections require a functional test be performed of the oxygen system to ensure that the doors on the mask containers open and the masks drop out.

Due to the above referenced report, Raytheon Aircraft Company is re-emphasizing the importance of these inspections and correct installation regardless of aircraft model. Please refer to the applicable Maintenance Manual when conducting the next mask inspection/maintenance check.

Excerpt from RAC Comunique No 99-005:

Passenger Oxygen Mask Packing - All

We must once again stress the importance of properly packing and stowing the Passenger Oxygen Masks. RAC Technical Support has received a report from Australia Authorities stating that some of the passenger oxygen masks on a King Air Model 200 did not deploy. Further investigation found the auto-deployment system functioning correctly, but the oxygen mask container door had not been reinstalled correctly during a previous mask inspection. If the door is installed 180 (degrees) from the correct position, the door open plunger cannot strike the block mounted on the door and the door will not open. There are caution statements in the Model 200 Maintenance Manual (Chapter 35-00-00) which warn maintenance technicians to properly repack the masks and install the door correctly, but due to the above reference report, we wanted to re-emphasize the importance of proper installation. Please refer to the Maintenance Manual if there are any questions at your next mask maintenance check.

 
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Last update 01 April 2011