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Interim Recommendation issued to: Raytheon Aircraft

Recommendation details
Output No: IR19990150
Date issued: 07 October 1999
Safety action status:
Background: Why this Interim Recommendation was developed

Output text

The Bureau of Air Safety Investigation recommends that Raytheon Aircraft develop and publish methods for the in-situ testing of the automatically deployable passenger oxygen activation system and the cabin altitude alert system on Beechcraft aircraft, to ensure complete system operation.

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

IR19990151

The Bureau of Air Safety Investigation recommends that the Civil Aviation Safety Authority reassess the appropriateness of the current maintenance procedures for the testing of automatically deployable passenger oxygen systems and cabin altitude alert systems, to ensure complete system operation.

IR19990152

The Bureau of Air Safety Investigation recommends that the Federal Aviation Administration reassess the appropriateness of the current maintenance procedures for the testing of automatically deployable passenger oxygen systems and cabin altitude alert systems, to ensure complete system operation.

IR19990153

The Bureau of Air Safety Investigation recommends that Raytheon Aircraft consider the incorporation of an audible warning to operate in conjunction with the cabin altitude alert system on all Beech aircraft so equipped.

IR19990154

The Bureau of Air Safety Investigation recommends that the Civil Aviation Safety Authority consider the incorporation of an audible warning to operate in conjunction with the cabin altitude alert system on Beech aircraft, and other aircraft so equipped.

IR19990155

The Bureau of Air Safety Investigation recommends that the Federal Aviation Administration consider the incorporation of an audible warning to operate in conjunction with the cabin altitude alert system on Beech aircraft, and other aircraft so equipped.

 

Initial response
Date issued: 18 July 2000
Response from: Raytheon Aircraft
Action status: Monitor
Response text:

In accordance with Interim Recommendation IR19990150, RAC has reviewed the B200 Maintenance Manual Procedures for Functional Test Procedure of the Oxygen Auto-deploy System, and finds it appropriate for the system. However, there is no functional test for either of the barometric switches (one for the oxygen system and one for the annunciator system) installed in the airplane. RAC will add a procedure to the maintenance manual to functionally check the barometric pressure switches.

RAC reviewed the maintenance manual and found that there is a "press to test" (which checks the annunciator lights). In the oxygen system functional test procedure, one of the steps is to verify the oxygen indicator light (green, in the caution/advisory panel) is illuminated. These tests meet the certification requirements for the airplane. Therefore, RAC plans no revisions to the Maintenance Manual with regard to functional test of the oxygen system.

ATSB response:

The following correspondence from the ATSB was forwarded to RAC on 22 March 2002.

In regards to the above recommendation made on the 7 October 1999, to Raytheon Aircraft and your response dated 10 July 2000 (A947-00-07-L03), we have reclassified your response to 'Monitor' as we have not seen the changes to the King Air aircraft maintenance manual. This is a new classification that was not available at the time of our initial assessment to your response.

In your response dated 10 July 2000 to the ATSB recommendation IR 19990150 you have indicated that;

"RAC will add a procedure to the maintenance manual to functionally check the barometric pressure switches".

Could you please supply us copies of the relevant section/s of the amended maintenance manual/s?

To ensure that all aspects of the ATSB recommendation IR 19990150 are addressed could you please provide the relevant information that shows that the test procedures for the automatically deployable passenger oxygen activation system and the cabin altitude alert system will test the complete system.

Your response dated 10 July 2000 to the ATSB recommendation IR 19990150 states that;

"...RAC has reviewed the B200 Maintenance Manual Procedures for Functional Test Procedure of the Oxygen Auto-deploy System...".

ATSB recommendation IR 19990150 was issued with respect to Beechcraft aircraft but your response addresses the B200 type. Has Raytheon addressed other Beechcraft aircraft types that may have automatically deployable passenger oxygen activation systems and cabin altitude alert systems? If so, could you please provide the results of the review/s and the relevant section/s of the amended maintenance manual/s?

On receipt of evidence to show that the recommendation has been addressed to cover these questions, we will review our classification.

 
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Last update 01 April 2011