Реферат: Replacement Of Main Aircraft Batteries In The
Aircraft Year Total Man/Hours Hourly Rate Total Man/Hour Costs
HU-25 1998 886 $16.00 $14,176.00
HU-25 1997 860 $16.00 $13,760.00
HU-25 1996 914 $16.00 $14,624.00
Tesla TI4676 MPU Dry-Cell battery is a maintenance free battery
STUDY 3
METHOD
Subjects. Reviewed SAFT 2376 NICAD battery and Tesla TI4676 MPU Dry-Cell MSDS specification sheets and technical manual for each respective battery.
NICAD BATTERY
1. Cadmimum & Cadmium Hydroxide
2. Nickel & Nickel Hydroxide
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3. Potassium Hydroxide or Sodium Hydroxide
4. Cobalt Hydroxide
TESLA DRY-CELL BATTERY
1. No Hazardous Material
MSDS for the NICAD battery see appendix A.
DISCUSSION
Description of Batteries
The SAFT 2376 NICAD battery has been used in the HU-25 aircraft since 1981. It has been a reliable and competent battery. The objective for replaceing the NICAD battery is not due to a failing component or lack of parts in stock system to maintain them. It is a matter of newer technology that will provide an equivalent performance while eliminating maintenance man/hour costs, hazardous material, and safety concerns.
The Tesla TI4676 Micro Power Unit (MPU) Dry-Cell battery meets all specifications required for HU-25 aircraft main battery operation and meets or exceeds all performance characteristics of the NICAD battery. See appendix A for TI4676 MPU output voltage and maximum output current charts.
Study 1 lists data to support short and long term costs related to converting to the Tesla Dry-Cell battery. The initial cost to purchase seventy Tesla Dry-Cell batteries to support the Coast Guards fleet of 24 HU-25 aircraft and supply
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units with spares equivalent to the number presently in the system. This data shows that the initial cost to make the conversion will be very expensive costing $231,000. Tesla Industries Inc. stated that the Coast Guard would not need to have as many spare batteries in the HU-25 fleet as they could guarantee that when we sent a battery out for overhaul we would receive a replacement within 48 hours. This would have to be looked into further, but may allow a small savings on the initial purchase. Replacement part costs are also a reacurring expense that was looked at to determine if the Tesla battery would be subject to high costs in this area. The data shows that in this area costs are comparable and perhaps slightly lower for the Tesla Dry-Cell battery. This is an arbitrary conclusion though since no one can predict when either battery is going to fail. Tesla Industries Inc. provided the overhaul cost data and the NICAD battery parts cost were researched in the Federal Stock System data base.
Study 2 lists data to support long term costs related to maintenance man/hours. The Tesla battery is maintenance free if it fails it can be recharged in two to three minutes in the aircraft or in a shop in 1.25 hours using just standard 115VAC 60 Hz power. If the Tesla battery still fails after recharge it is sent to Tesla Industries Inc. for overhaul. The NICAD battery is much more labor intensive and my research of its maintenance history was done using the Coast Guard Aircraft Computerized Maintenance System data base records for one air station that is Aviation Training Center Mobile. While this is not a complete history of all units I did take records from over a three year period to ensure the numbers were consistent. I also did not include man/hours for removal/installation (since this is something the Tesla battery may be subject to, however I do not feel it would not occur at the same repetition) nor did I track hours it takes to deep cycle/recharge batteries when it is purely a function of a using an Automatic Reflex Charger – Analyzer and man/hours are not actually expended. The dollar costs for man/hours to maintain the NICAD battery is very expensive, for ATC Mobile
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