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Interim Recommendation issued to: Raytheon Aircraft

Recommendation details
Output No: IR19990153
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 consider the incorporation of an audible warning to operate in conjunction with the cabin altitude alert system on all Beech aircraft so equipped.

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.

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.

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: Closed - Not Accepted
Response text:

The 200 Series King Air's Annunciator system consists of a warning annunciator panel with red readouts in the center of the glareshield. Two red master warning flashers are located in the glareshield, one in front of the pilot and one in front of the co-pilot. The altitude warning annunciator triggers the master warning system.

The annunciators are the "word readout" type. Whenever a fault condition covered by the annunciator system occurs, a signal is generated and the appropriate annunciator is illuminated. If the fault requires the immediate attention and reaction of the pilot, the appropriate red warning annunciator in the warning annunciator panel illuminates and both master warning flashers begin flashing. Any illuminated lens in the warning annunciator panel will remain on until the fault is corrected.

Therefore, in the case of the subject incident, even though the pressurization system was not turned on, the pilot would have been presented with a red flashing light and a red "ALT WARN" when the cabin altitude exceeded 12,500 feet. These two warnings are more than adequate and meet the certification requirements of the Model B200. There are over 1,600 Model 200 King Airs in operation worldwide with this system installed. Raytheon Aircraft does not believe it is necessary to add aural warning to an already proven visual system.

 
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Last update 01 April 2011