Recommendation

The Office of Accident Investigation is in receipt of your
recommendations concerning "B-200 Passenger Oxygen System."



Your recommendations have been forwarded to the appropriate office
for response. Your recommendations have been identified as 99.301
through 99.303, and inquiries should reference these numbers.



You will be kept informed as to the progress and final resolution
of your submission. If you have any questions, please contact this
office.

Subject: FAA Safety Recommendations 99.301 through 99.303



The Office of Accident Investigation convened a Safety
Recommendation Review Board to review the enclosed responses to
your safety Recommendations. As a result, the Review Board
classified your recommendations as follows:



99.301 - "Closed-Not Adopted"

99.302 - "Open-Awaiting Further Response"

99.303 - "Closed-Not Adopted"



If you have any questions, please contact [name and phone number
provided].



ATSB Note: The following extract was part of the enclosure and is
published for clarification.



1. Recommendation 99.301 - 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 aircraft
and, all other aircraft similarly equipped.



The Raytheon Aircraft maintenance manual for the Beech Super King
Air 200 Series airplanes requires that an oxygen system functional
test be performed at the Phase 1 and Phase 3 inspections. This
results in an initial inspection at 200 hours and subsequent
inspections every 400 hours. During each oxygen system inspection,
the operator is required to ensure that the doors on the mask
containers open and the masks drop out. Additionally, the Model 200
Series Maintenance Manual cautions operators that the oxygen
"Container door can be positioned 180' off. If this happens, the
plunger cannot push the door open when activated." Other similarly
equipped aircraft have the same oxygen system maintenance schedule.
The Model 300 Series Maintenance Manual does not have the
additional cautionary note.



However, Raytheon has committed to revising this manual to add a
similar note to that in the Model 200 manual. To provide an added
level of awareness to operators, Raytheon Aircraft has published an
article regarding this subject in a King Air Model Communique. The
Communique will be mailed to all operators of Raytheon aircraft
equipped with auto-deploy oxygen masks to ensure that all operators
are aware of the importance of properly installing the doors on the
oxygen mask boxes. Considering the maintenance instructions already
in place, issuance of an Airworthiness Directive for an immediate
check of the fitment of passenger oxygen system mask container
doors would not significantly add to the safety of the fleet.



In conclusion, this office recommends the Safety Recommendations
99.301, 99.302 and 99.303 be closed. No further ACO action is
required or planned.