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"Reasonable" is relative, my friend.Member discount at www.opticshq.com brings the SureFire A2 down to a quite reasonable $157.95.
These regs all need to be taken in the proper context. The part 91 reference that you quoted only applies to large and turbine powered multiengine and fractional airplanes being operated under part 91. Also, the reg you referenced says nothing about the pilot needing to carry the flashlight. Every other regulation regarding flashlights in part 91, part 135 and part 121 apply only to what the aircraft needs to be equipped with, not what the pilot needs to carry. 121.549 is the only regulation which says that a pilot needs to carry any kind of flashlight at all. This regulation says nothing about D cells, and only requires that the thing works.......so do my opspecs and I'm sure, every other opspecs that reference this regulation.
according to the FAA the only thing equivalent to a D Cell is a D cell, if it looks like a D cell, feels like a D cell it's a D cell, not a C cell, not a AA, not a AAA.
These regs were written before LED flashlights have hit the market. I'm sure they required D cells so that the flashlight would last more than a hour. As we all know, a LED flashlight with 3AA's would outlast a regular flashlight powered by 2 D cells. Technically you are correct, but common sense says you are wrong. Thankfully, I've never heard of anyone getting 'busted' not having a 2 D cell flashlight.
-CF
What paragraph in your ops specs discusses flashlights? Checked my company manual is specifies 2 D Cell or equivalent, that's clear enough for me, according to the FAA the only thing equivalent to a D Cell is a D cell, if it looks like a D cell, feels like a D cell it's a D cell, not a C cell, not a AA, not a AAA.
A UM-1 Battery is equivalent to a D cell
Why are these 20 something, backpack toting, Junior Jet pilots always trying to push the envelope?