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Doug Hereford

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About Doug Hereford

  • Birthday 01/23/1971

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  • Location
    Kansas City
  • Interests
    Aviation
  • Gender
    Male

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  1. Fast Eddie, The SR22 is a very "electrical" airplane, but your comparison is very valid in my opinion. From a purely economical stand-point, one cannot properly recover a dead (or charge depleted) lead-acid battery without utilizing constant current charging (which the aircraft system cannot do). This is probably the reason for the POH recommendation. If you simply "jump started" the Cirrus aircraft, and dispatched, the battery performance would very likely suffer in the long run leading to premature replacement. More importantly, if you had an electrical system failure, and a jump started battery, you may not have sufficient reserve power to keep stuff on the line ( I realize SR22's have a #2 battery). Dark screens are one thing, but no fuel boost pump could be a problem in a missed approach or other situation close to the surface. Doug Hereford
  2. I agree with the responses. I would underscore the point about electrical reserve. In general, the primary purpose of an aircraft battery (we call them storage batteries in many cases) is emergency power. They store energy to be used in the event of failure of the primary electrical system (alternator). A deeply discharged battery (no matter what type) will have different charging or recovery needs than one that has had a partial discharge (like normal engine start). Normally, aircraft electrical systems are not designed to recover a dead battery, and support the normally expected electrical loads encountered during flight operations. I'm not saying that a person cannot "get away with it", but if there is and electrical failure during flight, the emergency power supply (battery) that was designed to provide a certain amount of continuous power for electrical loads needed to return and land, may not be there. My opinion is that if you operate an aircraft where dispatch is critical such as flight training, have a second battery on a maintenance charge condition and R&R the batteries instead of jump starting. Otherwise cancel the flight, and remove and recover the battery (if possible) IAW proper procedures. I realize Jim that this does not answer the question as to why the M/M warning. Maybe that's one for the bean counters.
  3. Doug,

    Send me your email address. I have some input on the issues you've raised, but I can't post them here.

    jstewart@jkmicro.com

    best,

    -jim

  4. Her reply to you sounds very familar.

  5. I talked to Carol about this about 3 years ago. She said, in so many words, that the FAA doesn't understand the regulations and that it was up to her and her husband to interpret the rules for the FAA, since the Carpenters knew more than the FAA did. That's why you hit a roadblock in OK. It didn't help matters that all her graduated LSR-M minions accepted and spread everything sh...

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