The International Cessna^® 170 Association

So when they say 2"D" cell or equiv. do they mean equiv. to be:
1. the amp hour capacity of 2 "d" cells
a. alkaline
b. zinc carbon
c. lithium
d. nicad/ nimh

2. the light output
a. lumens
b. candela

I can go on but I will not.
However mabe I will, I did just compare a standard issue airline 2 cell "D" with alkaline to a 3 cell "AA" gerber reactor led lamp flashlight with my canon light meter. Using a standard grey card I got a reflected EV. of 9 for the 2 "D" cell flashlight which has a burn time of 3 to 4 hours compared to the EV of 10 (higher output) of the led lamp which has a burn time of 15 hours full output and 75 hours burn time.
I'm shure you have heard the term " a rose is a rose" but when the goverment is involved a rose may not be just a rose, or better yet if it looks like a duck, walks like a duck, quacks like a duck its probably a hippopotamus

Oh and flashlight requirement is for part 135 operators I belive.

That's spme neat testing Vic. The reg. just says 2 "D" cell or equivilant. That's it. Don't know what testing the FAA would except for "equivilant". Most operators I know just make sure they have one with 2 "D" cells. Then there is no guestion. We have one in the MedEvac helicopter I fly under 135 and never use it preferring instead to use a mini mag lite.

I have it on good authority that "equivalent" means equal with regard to weight.
(Do not forget that it's mass results in it becoming a missle in turbulence and crashworthiness requires a mount capable of sustaining 9G's. FAR's require that it's operating instructions be followed to the letter, so if you crash do NOT burn. Otherwise you will be issued a citation for incinerating the batteries in violation of it's mfr's instructions.)