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Interim Recommendation issued to: Civil Aviation Safety Authority

Recommendation details
Output No: IR19990151
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 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.

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

IR19990150

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.

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: 08 March 2002
Response from: Civil Aviation Safety Authority
Action status: Closed - Accepted
Response text:

CASA wrote to the aircraft manufacture Raytheon Aircraft Corporation (RAC) requesting details of the functional test procedure for the barometric switches for both the cabin altitude alert warning and oxygen auto deploy systems.

In a response received by the ATSB, RAC advised that they had reviewed the B200 maintenance manual Functional Test procedures for the Oxygen Auto-deploy system and found it to be appropriate. However, RAC advised that there is no functional test for either of the barometric switches in the oxygen system or altitude alert warning system.

RAC also confirmed the maintenance manual procedure for functional test of the annunciator warning lights for both systems meets certification requirements. Further, RAC has agreed to include procedures in the aircraft maintenance manual to functionally check the barometric switches in both systems.

CASA is satisfied that the RAC action to include a functional test in the aircraft maintenance manual for barometric switches in the oxygen and cabin altitude alter warning systems is appropriate and that no further action is required at this time.

 
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Last update 01 April 2011