Help with Training scenario

silverbusa

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« on: January 25, 2010, 11:00:27 AM »

A few months ago I started flying Helicopters. What a thrill, however now I realize there is a ton of info to know before a flight can even get the green light. I wanted some help with a particular problem presented in a training class. I was told there is no correct answer but this gives me an idea of what I need to be thinking about before a flight can proceed.

The scenario is as follows:

Helicopter is at point A and must determine if a flight can go over a mountain ridge to point B. Take off Point A is at 6000 ft MSL and go over a ridge top of 9500 Ft MSL to point B at 7000 ft MSL. The distance from A to B is 100 NM.

Helicopter--R22 Beta (max gross weight 1370lbs)
has aux. fuel tank
2 people 175 lbs each
Temp--26 degrees Cel.
29.92 Hg.
TC--090 degrees
Wind 160----14kts

This is everything given to me for the problem. With this info, what needs to be worked out to see if a safe flight can be performed? How is this to be worked out? Is everything with in limits?


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chopper1

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Re: Help with Training scenario

« Reply #1 on: January 25, 2010, 07:38:05 PM »

Need to have cruise performance information from the POH to determine if the helicopter will be able to clear the rigdeline....

Sounds warm to me... ISA temp at 6000 feet is about 3C, so you're flying in ISA plus 23 temps... What's the DA at the ridgeline? Do you have any margin at that DA?

FWIW, I have flown the Robbie at near max gross out of a meadow at about 8-9000 ft DA, and the hovering performance was so marginal we did a running takeoff to get airborne. My guess is that the 9500 ft ridgeline at ISA+23 would be iffy...

Are those winds at the surface or aloft?

What is the wind speed and orientation to the ridgeline?

No correct answer? Really? If the helicopter won't climb to 9500 feet in those conditions, would you go anyway? What if the winds at the ridgeline were a 30-40 kt headwind and crossed it at 90 degrees?

There are lotsa things to consider when flying near the performance limits of an aircraft in the mountains... Which is what your instructor is pointing you to discover.


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silverbusa

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Re: Help with Training scenario

« Reply #2 on: January 26, 2010, 11:02:16 AM »

Thanks for the info. I realized that it was a probing question to get me thinking about everything.

My instructor did tell me that no matter if I say the flight could be completed or not, I will forget about something that I need to be aware of.


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