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Chuck and other List participants: "Common failure mode", as applied to scuba equipment, is an issue that concerns me greatly. I've often wondered whether, for example, a tech diver ought to utilize different (albeit both superior) regulators on his/her manifolded doubles--say, a Scubapro Mk 20/G250 on one post and a Poseidon Odin on the other, since they appear to have distinct failure modes--as a hedge against the common failure mode of "redundant" regulators. As a second example, should a tech diver carry backup lights that are both identical? All replies shoud be addressed to the List. Thanks in advance for your input. Ronald P.S. For the record, in my five years of extended range diving in the Great Lakes, I have personal knowledge of only one occasion when both of a diver's regulators failed. Both of the diver's regulators were Poseidon Odin first stages with Scubapro D400 second stages. The diver was using air in his manifolded HP 100's. Water temperature was near 40 F. Depth was approximately 200 ffw. The diver switched to his backup second stage reg when his primary began free-flowing. The backup began free-flowing almost immediately. Common failure mode? P.P.S. My apologies if this topic has been discussed before; I've been observing the List for only one year. And I was unable to find any reference to this topic in the Archives. Sherie Rodekohr Columbia Career Center Vocational Horticulture 4203 S. Providence Rd. Voice: (314)886-2610 Columbia, MO 65203 FAX: (314)886-2904 Internet: srodekoh@ma*.co*.mi*.ed* x -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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