COMMERCIAL AND BUSINESS
AVIATION ADVISORY CIRCULAR
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Standardization of Terminology Related to Aircraft Emergency Procedures
INTRODUCTION
The purpose of this Commercial & Business Aviation Advisory Circular (CBAAC)
is to inform air operators and private operators of a potential safety hazard
associated with the use and interpretation of the terms "possible",
"practical", "practicable", "suitable" and
"adequate" as they relate to aircraft emergency procedures.
APPLICABILITY
The information in this CBAAC applies to Canadian air operators and private
operators holding an Air Operator Certificate issued under Part VII or a Private
Operator Certificate issued under Part VI, Subpart 4 of the Canadian
Aviation Regulations (CARs).
REFERENCES
Transportation Safety Board Aviation Safety Advisory A990020
BACKGROUND
The Transportation Safety Board has identified a potential safety hazard related
to the ambiguous and inconsistent use of the terms "possible",
"practical", "practicable", "suitable" and
"adequate". Some Pilot Operating Handbooks and Aircraft Flight Manuals use
these terms without an associated definition. This has the potential to lead to an
inappropriate flight crew response in an emergency situation. For example, in an
emergency related to engine low oil pressure the use of the terms "land as
soon as possible" or "land as soon as practical" may
evoke entirely different and potentially inappropriate responses from the crews
involved due to the ambiguity of these terms.
CONCLUSION
Operators are encouraged to conduct a review of the flight crew interpretation of
terms such as "possible", "practical", "practicable",
"suitable" and "adequate" as they relate to aircraft emergency
procedures with a view to developing consistent application of the terms. Aircraft
and/or powerplant manufacturers should be consulted as required when developing any
company definitions.
FUTURE DISPOSITIONS
Transport Canada will recommend to all aircraft manufacturers that definitions of
these terms be developed and applied consistently in aircraft handbooks and manuals to
decrease any possibility of confusion, ambiguity or misinterpretation.
M.R. Preuss
Director
Commercial & Business Aviation
| Commercial & Business Aviation Advisory
Circulars (CBAAC) are intended to provide information and guidance regarding
operational matters. A CBAAC may describe an acceptable, but not the only, means
of demonstrating compliance with existing regulations. CBAACs in and of
themselves do not change, create any additional, authorize changes in, or permit
deviations from regulatory requirements. |
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