Items that can be used in aircraft

[ToiletDuck]

Sorry I can't remember the FAR off the top of my head. I was reading it earlier where it states that people can use things like an electric shaver and a few other select items. I don't fully understand why this reg exist. I've heard of items interfearing with instruments but I don't know any that actually pose a threat. Any history on these rules? I guess what throws me is the fact that the three things that make my TV blurry in the house are the blender, blowdrier, and my electric shaver. I asked a teacher once but he laughed and said he had no idea either. Can anyone humor me?
Duck

 

[User546]

91.21 Portable electronic devices.

(a) Except as provided in paragraph (b) of this section, no person may operate, nor may any operator or pilot in command of an aircraft allow the operation of, any portable electronic device on any of the following U.S.-registered civil aircraft:
(1) Aircraft operated by a holder of an air carrier operating certificate or an operating certificate; or
(2) Any other aircraft while it is operated under IFR.

(b) Paragraph (a) of this section does not apply to—
(1) Portable voice recorders;
(2) Hearing aids;
(3) Heart pacemakers;
(4) Electric shavers; or
(5) Any other portable electronic device that the operator of the aircraft has determined will not cause interference with the navigation or communication system of the aircraft on which it is to be used.

 

[moxiepilot]

91.21 Portable electronic devices.

(a) Except as provided in paragraph (b) of this section, no person may operate, nor may any operator or pilot in command of an aircraft allow the operation of, any portable electronic device on any of the following U.S.-registered civil aircraft:
(1) Aircraft operated by a holder of an air carrier operating certificate or an operating certificate; or
(2) Any other aircraft while it is operated under IFR.

(b) Paragraph (a) of this section does not apply to—
(1) Portable voice recorders;
(2) Hearing aids;
(3) Heart pacemakers;
(4) Electric shavers; or
(5) Any other portable electronic device that the operator of the aircraft has determined will not cause interference with the navigation or communication system of the aircraft on which it is to be used.

Yeah that

 

[Singlecoil]

The answer is: because the lobbyists from Norelco and Remington pressured the FAA to exempt their devices.

 

[dash8driver]

because no one has crashed as a result of shaving while shooting an ils yet.