Originally Posted by
HeliHJ
Could anyone enlighten me with an “on the job” technique method for power checking before going into a landing site. I currently fly light SEP’s and curious as to how you go about it on a big bird.
For info, one method I have been taught:
25kts gnd speed
check power
add 15% for IGE
add another 15% for OGE
Your “power check” appears to be a “rule-of-thumb.” And as such, it’s not intended to be strictly accurate or reliable for every situation. For example. Imagine flying at a density altitude where the power required for 25 knots is nearly the maximum power available. In that situation, HIGE and HOGE would probably be impossible. A HIGE/HOGE determination has 3 components, power required, power available and power assurance. Therefore, your “rule-of-thumb” really isn’t a “power check”.
It’s all on the screen (AS-350 VEMD shown):
