Mental Math

[RefugePilot]

I have an interview coming up. From the gouges I see they have asked to convert from FPM to FPNM. I have looked at the mental math link and there is no formula for this there.

I know of the chart in the IAP book. Is there a mental formula to get this?
Any other mental math formulas to have on hand would be appreciated.

I wanted the mental math for pilots book but when I saw it in a store, I seemed to be able to do most of the calculations in my head already, but as the interview approaches I am getting nervous.
Any help greatly appreciated.
THanks

 

[WMUchickenhawk]

I have an interview coming up. From the gouges I see they have asked to convert from FPM to FPNM. I have looked at the mental math link and there is no formula for this there.

I know of the chart in the IAP book. Is there a mental formula to get this?
Any other mental math formulas to have on hand would be appreciated.

I wanted the mental math for pilots book but when I saw it in a store, I seemed to be able to do most of the calculations in my head already, but as the interview approaches I am getting nervous.
Any help greatly appreciated.
THanks

What I do is divide my Groundspeed by 60, then multiply the FPM by that to get the FPNM. With an approachspeed like 90 or 120, its easy, and for the inbetween numbers its not to hard to extrapolate.

For example with a 90kt GS and a 500FPM descent required, you get 90/60= 1.5*500= 750, at 120 it would be 1000 FPNM

 

[dogismycopilot]

If you're talking about an ILS, a std. 3 degree glideslope is always 300 ft/nm no matter what the groundspeed.

 

[RefugePilot]

Fpnm

I am not sure of why they want had asked for that mental math problem. I am thinking for an alternate departure minimums, requiring a climb of greater than xxx FPNM for obstacle clearance.

 

[ReverseSensing]

Mental math for pilots:

Block in @ RON - Show time > 12 hours = Good times.
Block in @ RON - Show time < 12 hours = Slam/click.

 

[Mahi]

If you're talking about an ILS, a std. 3 degree glideslope is always 300 ft/nm no matter what the groundspeed.

uhhh... no.

 

[Crosstalk]

uhhh... no.

Well, the slope isn't changing is it? The fpm required to meet that would have to change, but the slope doesn't.

 

[Flying Illini]

Well, the slope isn't changing is it? The fpm required to meet that would have to change, but the slope doesn't.

Correct.

 

[Mahi]

Well, the slope isn't changing is it? The fpm required to meet that would have to change, but the slope doesn't.

Sorry, thought I read "always 300'/min". You said ft/nm, and you are correct.

 

[RefugePilot]

E6b

Someone showed me how to use an e6b to get this conversion.

Put the A/S under the triangle. Look for FPNM on inside wheel, opposite it will be FPM.