Recommendation R20020101

Recommendation issued to: Civil Aviation Safety Authority

Recommendation details
Output No: R20020101
Date issued: 03 July 2002
Safety action status:
Background: Why this Recommendation was developed

Output text

Safety Recommendation

The Australian Transport Safety Bureau recommends that the Civil Aviation Safety Authority ensure the adequacy of the maintenance requirements for calibration, functional test and return to service of barometric pressure switches used to activate cabin altitude alerting systems in Australian registered pressurised aircraft engaged in the carriage of fare paying passengers.

Initial response
Date issued: 01 October 2002
Response from: Civil Aviation Safety Authority
Action status: Closed - Accepted
Response text:

CASA intends raising an Airworthiness Bulletin (AWB) to provide advice on how this feature may be incorporated into maintenance documentation covering periodic maintenance of barometric pressure switches in Australian registered pressurised aircraft. CASA's long-term approach will be influenced by the response of other aviation authorities to the liaison initiated by CASA as the result of Recommendation 20020109.

The Civil Aviation Safety Authority issued on 01-October-2002, the following Airworthiness Bulletins (AWB):

AWB 21-1 Issue "Cabin Altitude Alert Pressure Switch Maintenance Requirements."
AWB 35-1 Issue 1 "Passenger Oxygen Mask Pressure Switch Maintenance Requirements"

These AWB can be viewed at

Last update 03 April 2012