Nick's response was obviously written in haste and is not quite correct. Both of these helicopters are certificated in accordance with Part 27 (not Part 29); Light twins certificated in accordance with FAR/JAR 27 may be certificated to Category A in compliance with Appendix C of FAR/JAR 27. Appendix C calls up a number of requirements from FAR/JAR 29, which provide a similar (but not equivalent) level of airworthiness and the provision of performance data. It should not be assumed that all light twins certificated in accordance with FAR/JAR 27 have been certificated to Category A.
Category A is a certification standard which provides assurance of continued flight in the event of a failure or design assessment to reduce the probability of failure. Engine isolation ensures that one engine failure is unlikely to lead to a second, and fire in an engine compartment can be detected, contained and/or extinguished. These provisions give a level of confidence that the helicopter can be operated for continuous periods over a hostile environment.
Category A also requires the provision of performance data so that One Engine Inoperative (OEI) obstacle clearance from take-off, through climb, cruise and landing can be calculated; this data includes: mass related take-off and landing procedures; heliport/helideck size limitations; distances and climb gradients (or rates of climb); and one-engine inoperative climb performance graphs. From these procedures and graphs an operator/pilot can establish a complete OEI flight trajectory.
Jim