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In a message dated 8/3/98, 1:48:19 AM, heseltine@ea*.ne* writes: <<advantage as breathing a fixed pO2 mixed on the fly>> Tell me you really don't expect your electronics to monitor and maintain a constant PO2 at all times??? I stopped using an Air Integrated computer when it failed in the middle of a cave dive, I am just glad I wasn't depending on it to monitor my PO2 level. And the unit in question failed on several different occassions for different reasons. Tell me what does a 20 degree instant temperature change do to the sensor BIAS??? >>Mir 23 Status Report >>Mission Control Center -- Korolev >>Friday, April 11, 1997 >>http://shuttle-mir.nasa.gov/shuttle-mir/mir23/status/week6/missrpt.html >>While this work was going on, Lazutkin started work on repairing the Elektron >>oxygen-generating system in Kvant-2. Although this unit was activated briefly >>several times, it shut off automatically. Ground personnel believe this is due to a >>faulty sensor in the control unit, which will be replaced by cannibalizing the same >>unit from the inoperative Elektron located in the Kvant-1. A new Elektron unit will >>be installed in Kvant-1 after it is brought to the Mir by the Atlantis astronauts in >>mid-May. . What part do you plan on cannibalizing during your ascent/deco??? >>Events from 2.5 minutes before the accident to about 5 minutes after. Times given >>are in Ground Elapsed Time (G.E.T.), that is, the time elapsed since liftoff of Apollo >>13 on April 11, 1970, at 2:13 PM Eastern Standard Time (EST). 55:52:00 G.E.T. is >>equal to 10:05 PM EST on April 13, 1970. >> http://www.hq.nasa.gov/office/pao/History/Timeline/apollo13chron.html >>55:54:43 - Flow rate of oxygen to all three fuel cells begins to decrease. >>55:54:45 - Oxygen tank No. 2 pressure reaches maximum value of 1008.3 psia. >>55:54:51 - Oxygen tank No. 2 quantity jumps to off-scale high and then begins to >>drop until the time of telemetry loss, indicating failed sensor. >>55:54:52 - Oxygen tank No. 2 temperature sensor reads -151.3 F. >>55:54:52.703 - Oxygen tank No. 2 temperature suddenly goes off-scale low, >>indicating failed sensor. >>55:54:52.763 - Last telemetered pressure from oxygen tank No. 2 before telemetry >>loss is 995.7 psia. >>................. >>55:55:20 - Swigert: "Okay, Houston, we've had a problem here." >>55:55:28 - Duke: "This is Houston. Say again please." >>55:55:35 - Lovell: "Houston, we've had a problem. We've had a main B bus >>undervolt." >>55:55:42 - Duke: "Roger. Main B undervolt." >>55:55:49 - Oxygen tank No. 2 temperature begins steady drop lasting 59 seconds >>indicating a failed sensor. >>55:56:10 - Haise: "Okay. Right now, Houston, the voltage is--is looking good. And >>we had a pretty large bang associated with the caution and warning there. And as I >>recall, main B was the one that had an amp spike on it once before. >>55:56:30 - Duke: "Roger, Fred." >>55:56:38 - Oxygen tank No. 2 quantity becomes erratic for 69 seconds before >>assuming an off-scale low state, indicating a failed sensor. Who you gonna call when things go bang and your sensor fails! Ray LaTulippe -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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